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Amorphization And Nanocrystallization Of Silcon Under Shock Compression
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Book Synopsis Amorphization and Nanocrystallization of Silcon Under Shock Compression by :
Download or read book Amorphization and Nanocrystallization of Silcon Under Shock Compression written by and published by . This book was released on 2015 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-power, short-duration, laser-driven, shock compression and recovery experiments on [001] silicon unveiled remarkable structural changes above a pressure threshold. Two distinct amorphous regions were identified: (a) a bulk amorphous layer close to the surface and (b) amorphous bands initially aligned with slip planes. Further increase of the laser energy leads to the re-crystallization of amorphous silicon into nanocrystals with high concentration of nano-twins. This amorphization is produced by the combined effect of high magnitude hydrostatic and shear stresses under dynamic shock compression. Shock-induced defects play a very important role in the onset of amorphization. Calculations of the free energy changes with pressure and shear, using the Patel-Cohen methodology, are in agreement with the experimental results. Molecular dynamics simulation corroborates the amorphization, showing that it is initiated by the nucleation and propagation of partial dislocations. As a result, the nucleation of amorphization is analyzed qualitatively by classical nucleation theory.
Book Synopsis Shock Compression of [001] Single Crystal Silicon by :
Download or read book Shock Compression of [001] Single Crystal Silicon written by and published by . This book was released on 2016 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicon is ubiquitous in our advanced technological society, yet our current understanding of change to its mechanical response at extreme pressures and strain-rates is far from complete. This is due to its brittleness, making recovery experiments difficult. High-power, short-duration, laser-driven, shock compression and recovery experiments on [001] silicon (using impedance-matched momentum traps) unveiled remarkable structural changes observed by transmission electron microscopy. As laser energy increases, corresponding to an increase in peak shock pressure, the following plastic responses are are observed: surface cleavage along planes, dislocations and stacking faults; bands of amorphized material initially forming on crystallographic orientations consistent with dislocation slip; and coarse regions of amorphized material. Molecular dynamics simulations approach equivalent length and time scales to laser experiments and reveal the evolution of shock-induced partial dislocations and their crucial role in the preliminary stages of amorphization. Furthermore, application of coupled hydrostatic and shear stresses produce amorphization below the hydrostatically determined critical melting pressure under dynamic shock compression.
Book Synopsis Advanced Approaches Applied to Materials Development and Design Predictions by : Abílio M. P. De Jesus
Download or read book Advanced Approaches Applied to Materials Development and Design Predictions written by Abílio M. P. De Jesus and published by MDPI. This book was released on 2020-03-25 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thematic issue on advanced simulation tools applied to materials development and design predictions gathers selected extended papers related to power generation systems, presented at the XIX International Colloquium on Mechanical Fatigue of Metals (ICMFM XIX), organized at University of Porto, Portugal, in 2018. In this issue, the limits of the current generation of materials are explored, which are continuously being reached according to the frontier of hostile environments, whether in the aerospace, nuclear, or petrochemistry industry, or in the design of gas turbines where efficiency of energy production and transformation demands increased temperatures and pressures. Thus, advanced methods and applications for theoretical, numerical, and experimental contributions that address these issues on failure mechanism modeling and simulation of materials are covered. As the Guest Editors, we would like to thank all the authors who submitted papers to this Special Issue. All the papers published were peer-reviewed by experts in the field whose comments helped to improve the quality of the edition. We also would like to thank the Editorial Board of Materials for their assistance in managing this Special Issue.
Book Synopsis High Entropy Materials by : Yong Zhang
Download or read book High Entropy Materials written by Yong Zhang and published by BoD – Books on Demand. This book was released on 2023-01-18 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-Entropy Materials - Microstructures and Properties summarizes recent developments in multicomponent materials. It discusses properties, processing, modeling, and applications of high-entropy materials, including metallic alloys and oxides. It also discusses solidification, sputtering, cryogenic treatments, CALPHAD methodology, biomedical implants, Fe-based superconductors, Fe-rich high-entropy alloys, and more.
Book Synopsis Dislocation Mechanism-Based Crystal Plasticity by : Zhuo Zhuang
Download or read book Dislocation Mechanism-Based Crystal Plasticity written by Zhuo Zhuang and published by Academic Press. This book was released on 2019-04-12 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dislocation Based Crystal Plasticity: Theory and Computation at Micron and Submicron Scale provides a comprehensive introduction to the continuum and discreteness dislocation mechanism-based theories and computational methods of crystal plasticity at the micron and submicron scale. Sections cover the fundamental concept of conventional crystal plasticity theory at the macro-scale without size effect, strain gradient crystal plasticity theory based on Taylar law dislocation, mechanism at the mesoscale, phase-field theory of crystal plasticity, computation at the submicron scale, including single crystal plasticity theory, and the discrete-continuous model of crystal plasticity with three-dimensional discrete dislocation dynamics coupling finite element method (DDD-FEM). Three kinds of plastic deformation mechanisms for submicron pillars are systematically presented. Further sections discuss dislocation nucleation and starvation at high strain rate and temperature effect for dislocation annihilation mechanism. Covers dislocation mechanism-based crystal plasticity theory and computation at the micron and submicron scale Presents crystal plasticity theory without size effect Deals with the 3D discrete-continuous (3D DCM) theoretic and computational model of crystal plasticity with 3D discrete dislocation dynamics (3D DDD) coupling finite element method (FEM) Includes discrete dislocation mechanism-based theory and computation at the submicron scale with single arm source, coating micropillar, lower cyclic loading pillars, and dislocation starvation at the submicron scale
Book Synopsis Amorphous Silicon And Related Materials (In 2 Parts) by : Hellmut Fritzsche
Download or read book Amorphous Silicon And Related Materials (In 2 Parts) written by Hellmut Fritzsche and published by World Scientific. This book was released on 1989-01-01 with total page 1153 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the most recent important ideas and developments in the field of Hydrogenated Amorphous Silicon and related materials. Each contribution is authored by an outstanding expert in that particular area.
Book Synopsis Yielding Under Compression and the Polyamorphic Transition in Silicon by : Jan Grießer
Download or read book Yielding Under Compression and the Polyamorphic Transition in Silicon written by Jan Grießer and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: We investigate the behavior of amorphous silicon under hydrostatic compression using molecular simulations. During compression, amorphous silicon undergoes a transformation from a low-density to a high-density structure. Depending on the temperature and the compression rate, the transformation occurs in a pressure range between 6 and 16 GPa. Ensemble-averaged density and elastic constants change discontinuously across the transition. Densification of individual glassy samples occurs through a series of discrete plastic events, each of which is accompanied by a vanishing shear modulus. This is the signature of a series of elastic instabilities, similar to shear transformation zones observed during shear yielding of glasses. We compare the structure obtained during compression with a quasiequilibrium form of amorphous silicon obtained by quenching a melt at constant pressure. This gives structures identical to compression at low and high pressure, but the transition between low- and high-pressure structures occurs gradually rather than discontinuously. Our observations indicate that the polyamorphic transition has the characteristics of a yield transition that occurs under compression instead of shear
Book Synopsis Amorphous Silicon and Related Materials by : Hellmut Fritzsche
Download or read book Amorphous Silicon and Related Materials written by Hellmut Fritzsche and published by World Scientific. This book was released on 1989-01-01 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the most recent important ideas and developments in the field of Hydrogenated Amorphous Silicon and related materials. Each contribution is authored by an outstanding expert in that particular area.
Book Synopsis Amorphous and Nanocrystalline Silicon Science and Technology 2004: Volume 808 by : Materials Research Society. Meeting
Download or read book Amorphous and Nanocrystalline Silicon Science and Technology 2004: Volume 808 written by Materials Research Society. Meeting and published by . This book was released on 2004-09-03 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book celebrates 20 years of MRS symposia on the topic of amorphous silicon. Contributors showed that the simplified theories developed to explain the limited experimental information available in the early eighties have spurred more sophisticated experimentation - either refining the early understanding or making it irrelevant. The differences of opinion that continue to exist and emerge are probably the hallmark of the amazing vitality of this field. Applications range from 'mature' thin-film transistors, solar cells and image sensors, to the 'emerging' possibility of erbium-doped nanocrystalline silicon-based materials for lasers and amorphous silicon quantum dots for luminescent devices. The book discusses material characterization, growth processes and devices. Each chapter is further subdivided into sections that group papers around common themes. Topics include: nanomaterials; electronic structure; metastable effects; understanding of growth processes; laser-induced crystallization; metal-induced crystallization; other growth techniques; newer devices; solar cells and thin-film transistors.
Book Synopsis Structure and Imperfections in Amorphous and Crystalline Silicon Dioxide by : R. A. B. Devine
Download or read book Structure and Imperfections in Amorphous and Crystalline Silicon Dioxide written by R. A. B. Devine and published by John Wiley & Sons. This book was released on 2000-05-18 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structure and Imperfections in Amorphous and Crystalline Silicon Dioxide Edited by R. A. B. Devine, University of New Mexico, USA J.-P. Duraud, ESRF, Grenoble, France and E. Dooryhée, ESRF, Grenoble, France Silicon dioxide is one of the most common naturally occurring materials. Its applications range from nuclear waste storage to optical fibre communications to silicon microelectronics. Experts from America, Europe and Japan have written chapters covering both the amorphous and the crystalline phases of the material with particular reference to its structure and defects. The book is divided into four sections: Topological Models for the Crystalline and Amorphous Phases Electronic Structure Macroscopic and Point Defects Processing and Applications of Crystalline and Amorphous Phases Engineers, researchers and postgraduate students of materials science, physics and engineering will all find this an extremely useful addition to their libraries.
Book Synopsis Materials Issues in Applications of Amorphous Silicon Technology: by : D. Adler
Download or read book Materials Issues in Applications of Amorphous Silicon Technology: written by D. Adler and published by Cambridge University Press. This book was released on 2014-06-05 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.
Book Synopsis Stability of Amorphous Silicon Materials and Solar Cells by : B. L. Stafford
Download or read book Stability of Amorphous Silicon Materials and Solar Cells written by B. L. Stafford and published by American Institute of Physics. This book was released on 1991 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: A reference for scientists working on amorphous silicon photovoltaic research and manufacturing. Researchers interested in solar energy should also find this volume of use.
Book Synopsis Technology and Applications of Amorphous Silicon by : Robert Street
Download or read book Technology and Applications of Amorphous Silicon written by Robert Street and published by . This book was released on 2014-01-15 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Amorphous and Polycrystalline Thin-Film Silicon Science and Technology - 2007: Volume 989 by : Virginia Chu
Download or read book Amorphous and Polycrystalline Thin-Film Silicon Science and Technology - 2007: Volume 989 written by Virginia Chu and published by Cambridge University Press. This book was released on 2007-10-18 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thin films of amorphous nano-, micro- and polycrystalline silicon, and related alloys, are used in active-matrix liquid crystal displays, solar cells, digital imagers and scanners. These products make large-area electronics the fastest growing semiconductor technology today and are encouraging further research on materials and devices. The success of amorphous silicon and polysilicon materials in commercial products is the driving force for the topic being one of the longest-running symposia and proceedings series of the Materials Research Society, providing excellent forums for reporting research results, exchanging ideas, and discussing scientific and technological issues. This volume, the most recent in the series, focuses on: defects and metastability; solar cells; alloys; crystallization and crystallization techniques; micro- and nanocrystalline silicon; thin-film growth; flexible substrates; novel applications; thin-film transistors; imagers and sensors; electronics and flexible substrates; electronic properties and metastability; structural properties; and nanocrystals, nanoclusters and nanowires.
Book Synopsis Crystallization Processes in Amorphous Silicon by : David Francis Waechter
Download or read book Crystallization Processes in Amorphous Silicon written by David Francis Waechter and published by . This book was released on 1987 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Defects in Amorphous Silicon by : Jung H. Shin
Download or read book Defects in Amorphous Silicon written by Jung H. Shin and published by . This book was released on 1994 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Physics of Hydrogenated Amorphous Silicon I by : J.D. Joannopoulos
Download or read book The Physics of Hydrogenated Amorphous Silicon I written by J.D. Joannopoulos and published by Springer. This book was released on 1984-06-01 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: With contributions by numerous experts
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