Characterization And Applications Of Metal Ferrite Nanocomposites

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Characterization and Applications of Metal Ferrite Nanocomposites

Author : Thomas Dippong
Publisher : Mdpi AG
ISBN 13 : 9783036530741
Total Pages : 108 pages
Book Rating : 4.5/5 (37 download)

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Book Synopsis Characterization and Applications of Metal Ferrite Nanocomposites by : Thomas Dippong

Download or read book Characterization and Applications of Metal Ferrite Nanocomposites written by Thomas Dippong and published by Mdpi AG. This book was released on 2022-01-30 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Special Issue focuses on ferrite-based nanomaterial synthesis and characterization including (i) Synthesis, (ii) Advanced chemical and physical characterization of structure and properties, (iii) Magnetic behaviour, (iv) Computational and theoretical studies of reaction mechanisms, kinetics, and thermodynamics, (v) Applications of nanomaterials in environmental, biological, catalytic, medical, cultural heritage, food, geochemical, polymer, and materials science. Additionally, the effect of reaction time, reaction temperature, and oleic acid concentration on the properties of CoFe2O4 nanoparticles was investigated. In this Special Issue, the effect of SiO2 embedding on the production of single-phase ferrites, as well as on the structure, morphology and magnetic properties of (Zn0.6Mn0.4Fe2O4)δ(SiO2)100-δ (δ = 0-100%) NPs, synthesized by the sol-gel method and annealed at different temperatures, is analysed. The obtained results indicated that the preparation route strongly influences the particle sizes and, implicitly, the magnetic behaviour of the NPs. The Zn0.6Mn0.4Fe2O4 embedded in SiO2 exhibits superparamagnetic-like behaviour, whereas the unembedded Zn0.6Mn0.4Fe2O4 behaves similar to a high-quality ferrimagnet. This Special Issue also includes the study on Bi2Cu(C2O4)4-0.25H2O synthesis by thermolysis, followed by its integration within a CuBi/carbon nanofiber (CNF) paste electrode and its application in electrochemical detection of amoxicillin (AMX) in aqueous solution. By adding a concentration step in the detection protocol, selective and simultaneous detection of AMX in a multi-component matrix is also possible.

Characterization and Applications of Metal Ferrite Nanocomposites

Author : Thomas Dippong
Publisher :
ISBN 13 : 9783036530758
Total Pages : 108 pages
Book Rating : 4.5/5 (37 download)

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Book Synopsis Characterization and Applications of Metal Ferrite Nanocomposites by : Thomas Dippong

Download or read book Characterization and Applications of Metal Ferrite Nanocomposites written by Thomas Dippong and published by . This book was released on 2022 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Magnetic Nanostructures

Author : Kamel A. Abd-Elsalam
Publisher : Springer
ISBN 13 : 303016439X
Total Pages : 329 pages
Book Rating : 4.0/5 (31 download)

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Book Synopsis Magnetic Nanostructures by : Kamel A. Abd-Elsalam

Download or read book Magnetic Nanostructures written by Kamel A. Abd-Elsalam and published by Springer. This book was released on 2019-05-23 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, magnetic nanostructures have gained a remarkable interest for basic research and applied studies. Because of their low cost and ease of manufacture and modification, they have great potential for agricultural and environmental applications. The use of magnetic nanostructures has been proven in a wide range of fields including catalysis, biotechnology, biomedicine, magnetic resonance imaging, agriculture, biosensors, and removal of environmental pollutants, among others. This book includes 16 chapters of collected knowledge, discoveries, and applications in agriculture, soil remediation, and water treatment. It describes the role of nano-agriculture with regard to food security and discusses environmental and agricultural protection concerns. It further offers potential applications of magnetic nanomaterials in the agriculture and food sectors, such as the development of sensors, environment monitoring for wastewater treatment and the remediation of contaminated soils. Increasing crop yield through the use of nanopesticides or nanofertilizers and biosecurity using sensors for detecting pathogens along the entire food chain are discussed as well. This book also brings together various sources of expertise on different aspects magnetic nanostructure application in the agri-food sector and environment remediation. Magnetic nanostructures also have great potential in biotechnological processes, as they can be utilized as a carrier for enzymes during different biocatalytic transformations. Novel magnetic nanomaterials can be used for detection and separation of pesticides from environmental and biological samples. The excellent adsorption capacity of the modified magnetic nanoadsorbents together with other advantages such as reusability, easy separation, environmentally friendly composition, and freedom of interferences of alkaline earth metal ions make them suitable adsorbents for removal of heavy metal ions from environmental and industrial wastes. One of the most important environmental applications of magnetic nanostructures has been in the treatment of water, whether in the remediation of groundwater or through the magnetic separation and/or sensing of contaminants present in various aqueous systems. The integrated combination of these 16 chapters, written by experts with considerable experience in their area of research, provides a comprehensive overview on the synthesis, characterization, application, environmental processing, and agriculture of engineered magnetic nanostructures. Its comprehensive coverage discusses how nanostructure materials interact in plants as well as their potential and useful applications.

Advanced Spinel Ferrite Nanocomposites for Electromagnetic Interference Shielding Applications

Author : Raghvendra Singh Yadav
Publisher : Elsevier
ISBN 13 : 0128212918
Total Pages : 212 pages
Book Rating : 4.1/5 (282 download)

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Book Synopsis Advanced Spinel Ferrite Nanocomposites for Electromagnetic Interference Shielding Applications by : Raghvendra Singh Yadav

Download or read book Advanced Spinel Ferrite Nanocomposites for Electromagnetic Interference Shielding Applications written by Raghvendra Singh Yadav and published by Elsevier. This book was released on 2020-10-29 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Spinel Ferrite Nanocomposites for Electromagnetic Interference Shielding Applications presents recent developments in advanced spinel ferrite nanocomposites for electromagnetic interference shielding, including microwave absorption applications. The book includes the basics of shielding mechanisms, synthesis of advanced nanocomposites, and characterization, as well as results analysis. It also discusses the relationship between nanocomposite structure and physical properties. The book systematically explores how spinel ferrite nanoparticle composites are utilized with polymer, carbon source materials (carbon nanotube, graphene, etc.), metal nanoparticles, metal oxide nanoparticles, hard ferrite nanoparticles, glass, rubber, wood, fabrics/textiles, and cement/concrete in the development of advanced spinel ferrite nanocomposites for electromagnetic interference shielding application. Academics, scientists, engineers, students, and industrial researchers will find this book beneficial. - Provides an overview of recent developments on advanced spinel ferrite nanocomposites for electromagnetic interference shielding - Outlines fundamental concepts of electromagnetic shielding mechanisms in nanocomposites - Explores the design of a variety of nanocomposites, discussion on their structure and physical properties, used for electromagnetic shielding applications

Ferrite Nanostructured Magnetic Materials

Author : Jitendra Pal Singh
Publisher : Woodhead Publishing
ISBN 13 : 012823718X
Total Pages : 928 pages
Book Rating : 4.1/5 (282 download)

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Book Synopsis Ferrite Nanostructured Magnetic Materials by : Jitendra Pal Singh

Download or read book Ferrite Nanostructured Magnetic Materials written by Jitendra Pal Singh and published by Woodhead Publishing. This book was released on 2023-04-28 with total page 928 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ferrite Nanostructured Magnetic Materials: Technologies and Applications provides detailed descriptions of the physical properties of ferrite nanoparticles and thin films. Synthesis methods and their applications in numerous fields are also included. And, since characterization methods play an important role in investigating the materials' phenomena, various characterization tools applied to ferrite materials are also discussed. To meet the requirements of next-generation characterization tools in the field of ferrite research, synchrotron radiation-based spectroscopic and imaging tools are thoroughly explored.Finally, the book discusses current and emerging applications of ferrite nanostructured materials in industry, health, catalytic and environmental fields, making this comprehensive resource suitable for researchers and practitioners in the disciplines of materials science and engineering, chemistry and physics. - Reviews the fundamentals of ferrite materials, including their magnetic, electrical, dielectric and optical properties - Includes discussions on the most relevant and emerging synthesis and optimization of ferrite nanostructured materials for a diverse range of morphologies - Provides an overview of both the most relevant and emerging applications of ferrite magnetic materials in industry, health, energy and environmental remediation

Magnetic Ferrites and Related Nanocomposites

Author : Ali Ghasemi
Publisher : Elsevier
ISBN 13 : 0128240156
Total Pages : 658 pages
Book Rating : 4.1/5 (282 download)

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Book Synopsis Magnetic Ferrites and Related Nanocomposites by : Ali Ghasemi

Download or read book Magnetic Ferrites and Related Nanocomposites written by Ali Ghasemi and published by Elsevier. This book was released on 2022-06-16 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a fast-emerging and growing class of magnetic materials, ferrites have generated an increasing amount of interest for providing specific magnetic properties through controlled mixture in composites. The study of magnetic ferrite nanocomposites requires a multidisciplinary approach, involving novel synthesis techniques and an understanding of solid-state physics, electronic engineering, and material science. Magnetic Ferrites and Related Nanocomposites covers recent trends of various types of ferrite nanocomposites and evaluating the mechanisms for interpreting static and dynamic magnetic properties. Sections cover the fundamentals of magnetism, introducing different kinds of ferrites, ferrite characterization techniques, magneto-electric ferrite nanocomposites, exchange spring ferrite nanocomposites, shielding effectiveness and microwave absorption characteristics of ferrite-carbon materials, photocatalytic application of ferrite nanocomposites, and novel synthesis techniques for fabricating ferrite in nanoparticles, bulks, thin films, and nanofiber configurations. This book is an important reference for scientists, researchers, graduate students, and practitioners active in this field in order to broaden their understanding of ferrite nanocomposites and their impact on modern technology. - Provides background information regarding various basic magnetic phenomena and related theories, and defines the different natures of magnetic materials - Covers a wide range of hard and soft ferrites and related nanocomposites, particularly focusing on the correlation between structural features and magnetic analysis - Explores the role of substituted cations on the structural, thermal, magnetic, and microwave characteristics of ferrites and their nanocomposites - Discusses the mechanism involved for magnetic properties of major types of ferrite-ferroelectric magneto-electric components, exchange spring ferrite nanocomposites for fabricating next-generation permanent magnets, ferrite carbon nanocomposites for suppressing high-frequency electromagnetic radiation, and ferrite photocatalysts for omitting pollutants from our environment - Assesses the major challenges of experimental characterization and novel manufacturing techniques for fabrication of high quality ferrite, in terms of purity, shape, size, and distribution, and the application on an industrial scale

Magnetic Nanoferrites and their Composites

Author : Susheel Kalia
Publisher : Elsevier
ISBN 13 : 032395846X
Total Pages : 384 pages
Book Rating : 4.3/5 (239 download)

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Book Synopsis Magnetic Nanoferrites and their Composites by : Susheel Kalia

Download or read book Magnetic Nanoferrites and their Composites written by Susheel Kalia and published by Elsevier. This book was released on 2023-05-25 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic Nanoferrites and their Composites: Environmental and Biomedical Applications addresses recent developments in this important research field. The book covers the latest synthesis and fabrication techniques, properties, characterization and multifunctional biomedical and environmental applications. Chapters provide cutting-edge research while addressing the latest scenarios, recent developments, future aspects, and challenges and opportunities attributed to their excellent properties, including large surface-to-volume ratio, high chemical stability, low eddy losses, moderate values of saturation magnetization and coercivity, large adsorption, non-toxicity, bio-degradable and biocompatibility. This book will be a valuable reference resource for researchers, engineers and technologists working in this important research field. Magnetic nanoferrites and their composites are now utilized in a broad range of different application fields such as catalysis, biomedicine, magnetic resonance imaging (MRI), tissue targeting, drug delivery, sensors, environmental remediation, data storage, transformers, switching devices, high frequency and microwave devices. - Provides a systematic, comprehensive review on recent progress in magnetic nanoferrites and their related composites - Presents the latest synthesis techniques required for fabricating magnetic nanoferrites and their composites - Addresses the latest research towards enhancing the magnetic and photocatalytic degradation characteristics of magnetic nanoferrites and their composites

Ferrites

Author : Maaz Khan
Publisher : BoD – Books on Demand
ISBN 13 : 1839628685
Total Pages : 146 pages
Book Rating : 4.8/5 (396 download)

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Book Synopsis Ferrites by : Maaz Khan

Download or read book Ferrites written by Maaz Khan and published by BoD – Books on Demand. This book was released on 2021-11-17 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to their unique electrical and magnetic characteristics, ferrites are useful for a wide range of technological applications including refrigerators, air conditioners, microwave ovens, radio and telecommunication devices, and computers. This book presents knowledge about ferrites, their fabrication, characterizations, and applications in different areas. It is a useful resource for students, scientists, and engineers working in the field of ferrites.

Ferrite

Author : Gaurav Sharma
Publisher : Materials Research Forum LLC
ISBN 13 : 1644901595
Total Pages : 378 pages
Book Rating : 4.6/5 (449 download)

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Book Synopsis Ferrite by : Gaurav Sharma

Download or read book Ferrite written by Gaurav Sharma and published by Materials Research Forum LLC. This book was released on 2021-11-10 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ferrites are highly interesting high-tech materials. The book covers their classification, structure, synthesis, properties and applications. Emphasis is placed on biomedical applications, degradation of organic pollutants, high frequency applications, photocatalytic applications for wastewater remediation, solar cell applications, removal of organic dyes and drugs from aquatic systems, and the synthesis of hexagonal ferrites. Keywords: Ferrite, Spinel Ferrite Nanoparticles, Biomedical Applications, Ferrite Based Heterojunction, Photocatalytic Degradation of Organic Pollutants, Nickel-Zinc Ferrites, Spinel Ferrite Based Nanomaterials, Water Remediation, Magnetic Nano Particles, Wastewater Treatment, Piezo-Phototronic Effect, Ferrite Based Solar Cells, Aurivillius Based Ceramics, Hexagonal Ferrites.

Applications of Nanostructured Ferrites

Author : Jitendra Pal Singh
Publisher : Elsevier
ISBN 13 : 0443188750
Total Pages : 418 pages
Book Rating : 4.4/5 (431 download)

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Book Synopsis Applications of Nanostructured Ferrites by : Jitendra Pal Singh

Download or read book Applications of Nanostructured Ferrites written by Jitendra Pal Singh and published by Elsevier. This book was released on 2023-04-29 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applications of Nanostructured Ferrites provides an overview of materials design and characterization of ferrite nanomaterials for a diverse array of applications. In particular, the book investigates the large-scale use of ferrite materials, an important category of magnetic materials for environmental remediation such as waste water treatment. In addition, it considers ferrites to enable new technologies in energy, sensing, flexible and conductive electronics, and MEMs applications. This book is suitable for researchers and practitioners in the disciplines of materials science, engineering, chemistry and physics. - Provides explanations on the connection between ferrite properties and their use in a diverse array of applications - Includes information on the design of ferrite materials and their use in medical applications as drug delivery, hyperthermia and contrast agents - Discusses the possible role of magnetic ferrites nanoparticles in environmental remediation, agriculture, food and electronic technologies

Nanomaterials

Author : A. K. Haghi
Publisher : CRC Press
ISBN 13 : 1926895193
Total Pages : 298 pages
Book Rating : 4.9/5 (268 download)

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Book Synopsis Nanomaterials by : A. K. Haghi

Download or read book Nanomaterials written by A. K. Haghi and published by CRC Press. This book was released on 2013-03-11 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intended as a reference for basic and practical knowledge about the synthesis, characterization, and applications of nanotechnology for students, engineers, and researchers, this book focuses on the production of different types of nanomaterials and their applications, particularly synthesis of different types of nanomaterials, characterization of different types of nanomaterials, applications of different types of nanomaterials, including the nanocomposites.

Synthesis and Characterization of Ni0.5Co0.5FeAlO4 Ferrite

Author : Dr. Satish Baburao Shelke
Publisher : Insta Publishing
ISBN 13 : 8194718295
Total Pages : 104 pages
Book Rating : 4.1/5 (947 download)

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Book Synopsis Synthesis and Characterization of Ni0.5Co0.5FeAlO4 Ferrite by : Dr. Satish Baburao Shelke

Download or read book Synthesis and Characterization of Ni0.5Co0.5FeAlO4 Ferrite written by Dr. Satish Baburao Shelke and published by Insta Publishing. This book was released on with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has given an overview of the sol-gel auto-combustion preparation method and characterization of Ni0.5Co0.5FeAlO4. This work focused on the structural properties XRD,TGA, SEM, TEM, FTIR, Magnetic Properties, Dielectric Properties were measured.By using the TG curve the exact temperature of formation of ferrite phase was obtained.The properties such as dielectric constant, dielectric loss tangent as a function of frequency and temperature. The addition of aluminium results in increasing the resistivity which decreases the dielectric losses and saturation magnetization. Sintering temperature and synthesis rout plays important role in the fabrication of nano-structured ferrite materials. Attempts are made to synthesis the ferrites by changing their sintering temperature and synthesis route in order to study the structural, electrical and magnetic properties. In the present investigation we have prepared the nanocrystalline powder of Ni-Co-Fe-Al-O ferrite and sintered at four different temperature 5000C, 6000C, 7000C and 8000C. Effect of sintering temperature on the structural, electric and magnetic properties of Ni-Co-Fe-Al-O ferrite nanoparticles were studied.

Synthesis and Characterization of Ferrite Based Nanocomposites for Microwave Absorbing Applications

Author : Richard T. Olsson
Publisher :
ISBN 13 :
Total Pages : 67 pages
Book Rating : 4.:/5 (185 download)

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Book Synopsis Synthesis and Characterization of Ferrite Based Nanocomposites for Microwave Absorbing Applications by : Richard T. Olsson

Download or read book Synthesis and Characterization of Ferrite Based Nanocomposites for Microwave Absorbing Applications written by Richard T. Olsson and published by . This book was released on 2005 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Soft Nanoferrites for Biomedical and Environmental Applications

Author : Atul Thakur
Publisher : CRC Press
ISBN 13 : 1040131085
Total Pages : 349 pages
Book Rating : 4.0/5 (41 download)

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Book Synopsis Soft Nanoferrites for Biomedical and Environmental Applications by : Atul Thakur

Download or read book Soft Nanoferrites for Biomedical and Environmental Applications written by Atul Thakur and published by CRC Press. This book was released on 2024-10-11 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spinel nanoferrites have emerged as an advanced class of nanostructured materials in the domains of nanoscience and technology over the past decade. This book covers the fundamentals of spinel ferrites and their applications in the health sector and the environment. It focuses on the key applications of spinel ferrites in the health sector, such as hyperthermia, cancer diagnosis/treatment, and antimicrobial activity, as well as in environmental issues like water purification, wastewater treatment, and air pollution remediation. Features Covers the classification, synthesis, properties, structures, and applications of spinel ferrites. Provides exclusive coverage of biomedical and environmental applications. Includes discussions on environmental pollution, types of pollutants, and the removal of those pollutants using spinel nanoferrites. Reviews applications in cancer diagnosis and treatment, MRI, hyperthermia, and related fields. Recommends building environmentally-friendly ferrite materials for a clean environment. This book is aimed at graduate students and researchers in materials science, nanotechnology, environmental science, and bioengineering.

Applications of Nanocomposite Materials in Drug Delivery

Author : Inamuddin
Publisher : Woodhead Publishing
ISBN 13 : 0128137584
Total Pages : 988 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Applications of Nanocomposite Materials in Drug Delivery by : Inamuddin

Download or read book Applications of Nanocomposite Materials in Drug Delivery written by Inamuddin and published by Woodhead Publishing. This book was released on 2018-06-18 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applications of Nanocomposite in Drug Delivery discusses and explores the applications of nanocomposites in the area of drug delivery. Starting with a scientific understanding of drug delivery fundamentals, the book explores the utility of nanocomposites in the area of controlled, transdermal, osteo-articular tuberculosis and stimulus sensitive drug delivery applications. The book intricately details and discusses a variety of methods for their preparation, while also highlighting specific applications of nanocomposites in targeted drug delivery. - Discusses nanocomposite and nanotechnology for drug delivery - Outlines the mechanisms involved in targeted drug delivery using nanocomposites - Includes synthesis methods for nanocomposites used in controlled drug delivery - Lists various applications of nanocomposites in drug delivery

Characterization of Nanocomposites

Author : Frank Abdi
Publisher : CRC Press
ISBN 13 : 9814669032
Total Pages : 509 pages
Book Rating : 4.8/5 (146 download)

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Book Synopsis Characterization of Nanocomposites by : Frank Abdi

Download or read book Characterization of Nanocomposites written by Frank Abdi and published by CRC Press. This book was released on 2017-03-31 with total page 509 pages. Available in PDF, EPUB and Kindle. Book excerpt: These days, advanced multiscale hybrid materials are being produced in the industry, studied by universities, and used in several applications. Unlike for macromaterials, it is difficult to obtain the physical, mechanical, electrical, and thermal properties of nanomaterials because of the scale. Designers, however, must have knowledge of these properties to perform any finite element analysis or durability and damage tolerance analysis. This is the book that brings this knowledge within easy reach. What makes the book unique is the fact that its approach that combines multiscale multiphysics and statistical analysis with multiscale progressive failure analysis. The combination gives a very powerful tool for minimizing tests, improving accuracy, and understanding the effect of the statistical nature of materials, in addition to the mechanics of advanced multiscale materials, all the way to failure. The book focuses on obtaining valid mechanical properties of nanocomposite materials by accurate prediction and observed physical tests, as well as by evaluation of test anomalies of advanced multiscale nanocomposites containing nanoparticles of different shapes, such as chopped fiber, spherical, and platelet, in polymeric, ceramic, and metallic materials. The prediction capability covers delamination, fracture toughness, impact resistance, conductivity, and fire resistance of nanocomposites. The methodology employs a high-fidelity procedure backed with comparison of predictions with test data for various types of static, fatigue, dynamic, and crack growth problems. Using the proposed approach, a good correlation between the simulation and experimental data is established.

Synthesis and Characterization of Ni0.5Co0.5FeCrO4 Ferrite

Author : Dr. Satish Baburao Shelke
Publisher : Insta Publishing
ISBN 13 : 8194718279
Total Pages : 98 pages
Book Rating : 4.1/5 (947 download)

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Book Synopsis Synthesis and Characterization of Ni0.5Co0.5FeCrO4 Ferrite by : Dr. Satish Baburao Shelke

Download or read book Synthesis and Characterization of Ni0.5Co0.5FeCrO4 Ferrite written by Dr. Satish Baburao Shelke and published by Insta Publishing. This book was released on with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has given an overview of the sol-gel auto-combustion preparation method and characterization of Ni0.5Co0.5FeCrO4. This work focused on the structural properties XRD,TGA, SEM, TEM, FTIR, Magnetic Properties, Dielectric Properties were measured.By using the TG curve the exact temperature of formation of ferrite phase was obtained.The properties such as dielectric constant, dielectric loss tangent as a function of frequency and temperature. The addition of chromium in nickel – cobalt ferrite significantly changes the electrical and magnetic properties. Nickel and cobalt ferrites are inverse ferrites and hence for x £ 1, nickel ferrite shows structure of inverse spinel and for x >1, the inverse structure converted into normal structure. The crystal structure of ferrite, cation distribution, synthesis route, sintering conditions, amount and type of impurity addition decides the electric and magnetic properties of ferrites. Same ferrite with different crystalline size shows different properties. The electrical and magnetic properties even structural properties of ferrites at nano-crystalline phase shows significantly difference than the bulk one. In the present investigation we have presented the results on structural and magnetic properties of Ni0.5Co0.5FeCrO4 sintered at 5000C, 6000C, 7000C and 8000C for 6h.