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Author :
Publisher :
ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (929 download)
Download or read book Substrate Surface Structure Effects on Microstructure of Epitaxial Films written by and published by . This book was released on 1992 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (727 download)
Download or read book Substrate Surface Structure Effects on Microstructure of Epitaxial Films written by and published by . This book was released on 1992 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microstructure of epitaxial thin films grown on sapphire substrates using the metal organic chemical vapor deposition technique were found to depend on the substrates surface structure. Epitaxial TiO[sub 2] films grown on the sapphire (0001) substrates were highly-oriented polycrystal and the films on the (1120) substrates were single crystal. First-principles total energy calculations were carried out to gain atomistic understandings of sapphire surface structures and their effects on microstructure of epitaxial films. The surface terminating atom planes were found to be Al atoms for the (0001) surface and O atoms for the (1120). Minimum step heights were one sixth of the lattice constant c for the (0001) and one half of the lattice constant a for the (1120). Steps of minimum height or its odd multiples on sapphire (0001) surface double the number of variants in the deposited films. The symmetry and step of the substrate surface and symmetry of the epitaxial growth plane controlled the microstructure of the epitaxial films.
Author : Harry A. Atwater
Publisher : Mrs Proceedings
ISBN 13 :
Total Pages : 784 pages
Book Rating : 4.3/5 (91 download)
Download or read book Evolution of Surface and Thin Film Microstructure: Volume 280 written by Harry A. Atwater and published by Mrs Proceedings. This book was released on 1993-10-27 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.
Author :
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ISBN 13 :
Total Pages : 702 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jie He
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (823 download)
Download or read book Growth Mechanism and Interface Effects on Microstructure of Perovskite-type Barium Titanate-based Epitaxial Films written by Jie He and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This work was motivated and focused on the growth mechanism, microstructures and interfaces of barium titanate, BaTiO3 (BTO), based epitaxial thin films. Transimission electron microscopy (TEM), high resolution TEM (HRTEM), electron diffraction (ED) have been mainly employed in this study for microstructure investigations of BTO-based epitaxial thin films with the assistance of other materials characterization methods, such as X-ray diffraction (XRD), atomic force microscopy (AFM), Nanoindentation testing, etc. As a basic studying model, epitaxial BTO films were first deposited on the (001) MgO substrate using RF magnetron sputtering to provide fundamental knowledge of the film growth for BTO based thin films. The epitaxial BTO films show a tetragonal crystal structure (a = 4.02 Å and c = 4.11 Å) with epitaxial nanodomains induced from the rough film/substrate interface due to the modification of the substrate surface characteristics (steps, terraces, and kinks) during the deposition process. Two new phases of - calculus [gamma]y (Ba10TiO26) and Hß (BaTi8O24) were formed on the MgO substrate using RF magnetron sputtering. The atomic structures of the two new phases were determined and examined. The [gamma]y phase has a monoclinic structure, Cm, a=16.49 Å̊̊, b=8.94 Å, c=3.94 Å, y=77°. The Hß phase has a monoclinic structure, Cm, a = 17.88̊Å̊, b = 7.21Å, c = 3.94 Å̊̊̊, y =82°. Both [gamma]y and Hß phases have four different oriented domains. The orientation relationship between domains and MgO substrate is discussed. Initail study shows that these new phases possess novel and interesting properties. The doped BTO films with different dopant (Sr2 and Zr4) fabricated using pulsed laser deposition (PLD) have been studied for doping effects, interface effects and film growth mechanism. The (Ba, Sr)TiO3 (BST) epitaxial films grown on 1.2° and 5.3° miscut substrates consist of lager commensurate domains, and correspondly show higher dielectric constant and dielectric tunability, and lower average modulus and hardness than those of the films grown on the 3.5° miscut substrate. The results suggest that the differences on the interfacial structure have a tremendous effect on the properties of the films. The investigation on epitaxial Ba(Zr, Ti)O3 (BZT) and 2% Mn doped Ba(Zr, Ti)O3 (Mn:BZT) thin films grown on MgO substrate revealed the formation of twin-coupled domains on the epilayer by sharing their {111}/{110} planes as common planes. The structure evolution from epilayer to nanopillars is accomplished by alternatively introducing {111} and {110} twin boundaries, resulting in gradual shrinking or enlarging of the lateral size of the epitaxial grains/twin coupled nanopillars. The formations of twin domains, sharing planes and structure transition mechasim have been discussed in detail. Eventually, the microstructures and layer interfaces of [Mn:BZT//Mn:BST]N multilayer films consisting of 2% Mn doped (Ba, Sr)TiO3 (Mn:BST) and Mn:BZT layers on MgO (001) substrates with various deposition rates, deposition period numbers N were studied to provide an integral view of the formation of multilayer films in BTO system. All the [Mn:BZT//Mn:BST]N multilayer films present epitaxial quality and induced {111}/{110} twin-coupled domains initially formed at different film thickness/layers. The film/substrate interface has an important role for the formation of twin domains and the proportion of twin domain structures in the entire films. The layer interfaces between Mn:BST and Mn:BZT with period compression and extension strains were observed and discussed. The microstructure evolution and structure-related nano-mechanical properties of the multilayer films have been systematically investigated.
Author : Adriana Eleni Lita
Publisher :
ISBN 13 :
Total Pages : 408 pages
Book Rating : 4.3/5 (91 download)
Download or read book Correlation Between Microstructure and Surface Structure Evolution in Polycrystalline Films written by Adriana Eleni Lita and published by . This book was released on 2000 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Polly Wanda Chu
Publisher :
ISBN 13 :
Total Pages : 434 pages
Book Rating : 4.E/5 ( download)
Download or read book Ultrahigh Vacuum Metalorganic Chemical Vapor Deposition and in Situ Characterization of Nanoscale Titanium Dioxide Films written by Polly Wanda Chu and published by . This book was released on 1994 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thin titanium dioxide films were produced by metalorganic chemical vapor deposition on sapphire(0001) in an ultrahigh vacuum (UHV) chamber. A method was developed for producing controlled submonolayer depositions from titanium isopropoxide precursor. Film thickness ranged from 0.1 to 2.7 nm. In situ X-ray photoelectron spectroscopy (XPS) was used to determine film stoichiometry with increasing thickness. The effect of isothermal annealing on desorption was evaluated. Photoelectron peak shapes and positions from the initial monolayers were analyzed for evidence of interface reaction. Deposition from titanium isopropoxide is divided into two regimes: depositions below and above the pyrolysis temperature. This temperature was determined to be 300 deg C. Controlled submonolayers of titanium oxide were produced by cycles of dosing with titanium isopropoxide vapor below and annealing above 300 deg C. Precursor adsorption below the pyrolysis temperature was observed to saturate after 15 minutes of dosing. The quantity absorbed was shown to have an upper limit of one monolayer. The stoichiometry of thin films grown by the cycling method were determined to be TiO2. Titanium dioxide film stoichiometry was unaffected by isothermal annealing at 700 deg C. Annealing produced a decrease in film thickness. This was explained as due to desorption. Desorption ceased at approximately 2.5 to 3 monolayers, suggesting bonding of the initial monolayers of film to sapphire is stronger than to itself. Evidence of sapphire reduction at the interface by the depositions was not observed. The XPS O is peak shifted with increased film thickness. The shifts were consistent with oxygen in sapphire and titanium dioxide having different O is photoelectron peak positions. Simulations showed the total shifts for thin films ranging in thickness of 0.1 to 2.7 nm to be -0.99 to -1.23 eV. Thick films were produced for comparison.
Author : Viktor Elofsson
Publisher : Linköping University Electronic Press
ISBN 13 : 9176856399
Total Pages : 92 pages
Book Rating : 4.1/5 (768 download)
Download or read book Nanoscale structure forming processes written by Viktor Elofsson and published by Linköping University Electronic Press. This book was released on 2016-11-30 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thin film growth from the vapor phase has for a long time intrigued researchers endeavouring to unravel and understand atomistic surface processes that govern film formation. Their motivation has not been purely scientific, but also driven by numerous applications where this understanding is paramount to knowledge-based design of novel film materials with tailored properties. Within the above framework, this thesis investigates growth of metal films on weakly bonding substrates, a combination of great relevance for applications concerning e.g., catalysis, graphene metallization and architectural glazing. When metal vapor condenses on weakly bonding substrates three dimensional islands nucleate, grow and coalesce prior to forming a continuous film. The combined effect of these initial growth stages on film formation and morphology evolution is studied using pulsed vapor fluxes for the model system Ag/SiO2. It is shown that the competition between island growth and coalescence completion determines structure evolution. The effect of the initial growth stages on film formation is also examined for the tilted columnar microstructure obtained when vapor arrives at an angle that deviates from the substrate surface normal. This is done using two metals with distinctly different nucleation behaviour, and the findings suggest that the column tilt angle is set by nucleation conditions in conjunction with shadowing of the vapor flux by adjacent islands. Vapor arriving at an angle can in addition result in films that exhibit preferred crystallographic orientations, both out-of-plane and in-plane. Their emergence is commonly described by an evolutionary growth model, which for some materials predict a double in-plane alignment that has not been observed experimentally. Here, an experiment is designed to replicate the model’s growth conditions, confirming the existence of double in-plane alignment. New and added film functionalities can further be unlocked by alloying. Properties are then largely set by chemistry and atomic arrangement, where the latter can be affected by thermodynamics, kinetics and vapor flux modulation. Their combined effect on atomic arrangement is here unravelled by presenting a research methodology that encompasses high resolution vapor flux modulation, nanoscale structure v vi probes and growth simulations. The methodology is deployed to study the immiscible Ag-Cu and miscible Ag-Au model systems, for which it is shown that capping of Cu by Ag atoms via near surface diffusion processes and rough morphology of the Ag-Au growth front are the decisive structure forming processes in each respective system. The results generated in this thesis are of relevance for tuning structure of metal films grown on weakly bonding substrates. They also indicate that improved growth models are required to accurately describe structure evolution and emergence of a preferred in-plane orientation in films where vapor arrives at an angle that deviates from the substrate surface normal. In addition, this thesis presents a methodology that can be used to identify and understand structure forming processes in multicomponent films, which may enable tailoring of atomic arrangement and related properties in technologically relevant material systems.
Author : K. N. Tu
Publisher : Elsevier
ISBN 13 : 1483218295
Total Pages : 351 pages
Book Rating : 4.4/5 (832 download)
Download or read book Preparation and Properties of Thin Films written by K. N. Tu and published by Elsevier. This book was released on 2013-10-22 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: Treatise on Materials Science and Technology, Volume 24: Preparation and Properties of Thin Films covers the progress made in the preparation of thin films and the corresponding study of their properties. The book discusses the preparation and property correlations in thin film; the variation of microstructure of thin films; and the molecular beam epitaxy of superlattices in thin film. The text also describes the epitaxial growth of silicon structures (thermal-, laser-, and electron-beam-induced); the characterization of grain boundaries in bicrystalline thin films; and the mechanical properties of thin films on substrates. The ion beam modification of thin film; the use of thin alloy films for metallization in microelectronic devices; and the fabrication and physical properties of ultrasmall structures are also encompassed. Materials scientists and materials engineers will find the book invaluable.
Author : J. Dumas
Publisher : Elsevier
ISBN 13 : 0444596542
Total Pages : 763 pages
Book Rating : 4.4/5 (445 download)
Download or read book High Tc Superconductors written by J. Dumas and published by Elsevier. This book was released on 1993-05-05 with total page 763 pages. Available in PDF, EPUB and Kindle. Book excerpt: A wide range of progress in materials development [single crystals, ceramics, thin films, wire and tapes] is reported in the 169 papers in this volume. The main focus of the papers is in attaining a better understanding of the relationship between microstructure and electrical properties. Invited papers cover topics such as the effects of substitution and doping; multilayers; nanostructure characterisation; electric field effects in High Tc Superconductors [HTS]; surface stability; critical currents; flux pinning and magnetooptic imaging of flux patterns; effects of irradiation induced defects; properties and preparation of materials; microwave properties and electronic devices. A clearly broadened basis for understanding processes and mechanisms in [HTS] is portrayed. Appreciable progress has been achieved in the reproducible manufacturing of high quality materials supported by very efficient methods in microstructural analysis. This essential improvement is reflected in the increased number of practical devices encouraging the use of HTS in applications for electronics and power engineering, all of which are reviewed in depth in this work.
Author : Zachary Justin Reitmeier
Publisher :
ISBN 13 :
Total Pages : 247 pages
Book Rating : 4.:/5 (587 download)
Download or read book The Chemistry and Surface Microstructure of Si-based Substrates and Their Effect on the Evolution of the Microstructures of III-nitride Films Grown Via Metalorganic Vapor Phase Epitaxy written by Zachary Justin Reitmeier and published by . This book was released on 2005 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: hydrogen etching, cantilever epitaxy, lateral overgrowth, AlN, MOVPE, heteroepitaxy, threading dislocations, GaN.
Author :
Publisher :
ISBN 13 :
Total Pages : 654 pages
Book Rating : 4.3/5 (129 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John Sanchez, Jr
Publisher : Cambridge University Press
ISBN 13 : 9781107412170
Total Pages : 508 pages
Book Rating : 4.4/5 (121 download)
Download or read book Mechanisms of Surface and Microstructure Evolution in Deposited Films and Film Structures: written by John Sanchez, Jr and published by Cambridge University Press. This book was released on 2014-06-05 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: A wide variety of materials systems and deposition strategies have been developed to produce epitaxial and polycrystalline thin films. In particular, controlling the morphology and microstructure of metal films at the nanometer and/or micron scale has become crucial for applications such as giant magnetoresistive devices, contacts and diffusion barriers in integrated circuits and photovoltaics, and multilayer X-ray mirrors. This book, first published in 2001, focuses on the interactions between different mechanisms of microstructure evolution and film-growth conditions. Two sections of the volume, including a joint effort with Symposium R, Morphology and Dynamics of Crystal Surfaces in Molecular and Colloid Systems, highlight the fundamental mechanisms of epitaxial growth. Additional topics include: multilayers - stress in thin films; early stages of film growth - mechanical properties; texture in polycrystalline films; grain growth - barrier layers; and silicides and organic thin films - pulsed laser deposition.
Author : Jacques G. Amar
Publisher :
ISBN 13 :
Total Pages : 526 pages
Book Rating : 4.3/5 (91 download)
Download or read book Mechanisms of Surface and Microstructure Evolution in Deposited Films and Film Structures: Volume 672 written by Jacques G. Amar and published by . This book was released on 2001-11-12 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners. This book, first published in 2001, focuses on the interactions between different mechanisms of microstructure evolution and film-growth conditions.
Author : Tibor Braun
Publisher : World Scientific
ISBN 13 : 9814496596
Total Pages : 528 pages
Book Rating : 4.8/5 (144 download)
Download or read book Fullerene Research 1994-1996, A Computer-generated Cross-indexed Bibiliography Of Journal Literature written by Tibor Braun and published by World Scientific. This book was released on 1997-12-18 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is a follow-up to the computerized fullerene bibliography related to the 1985-1993 period. It is a well-indexed overview of the journal literature on a topic for which the 1996 Nobel Prize in Chemistry was awarded. It is an indispensable tool for any specialist interested in the literature of one of the most researched interdisciplinary topics in the sciences.
Download or read book Substrate Effects on the Structure and Optical Properties of Epitaxial PbTiO3 Thin Films Prepared by Metal-organic Chemical Vapor Deposition written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. A. Connell
Publisher :
ISBN 13 :
Total Pages : 37 pages
Book Rating : 4.:/5 (227 download)
Download or read book The Strength and Structure of Epitaxial Films written by R. A. Connell and published by . This book was released on 1966 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of epitaxial gold films was grown on sodium chloride substrates under a variety of conditions to determine effects of various types of grown-in impurities. Tensile tests were attempted on seven films of approximately 1,000 A thickness, but because of localized flaws or damage incurred during mounting, no useful tensile data were obtained. Consequently, interests centered primarily on changes in the microstructure of the films as determined by electron transmission microscopy, and on their implications for related tensile properties. Films were deposited at rates of the order of l A/sec in an all-metal bakeable system capable of operation in the ultrahigh vacuum range. Both cleaved and polished substrates were used at temperatures ranging between 280 C and 400 C. Micrographs of films prepared in a 10 to the-7th power torr vacuum were compared with those of films grown in approximately 0.00001 torr atmospheres of dry air and H2O. It was established that these contaminants produced only secondary effects on the film structure. By contrast, contamination with molybdenum-oxide produced by the reaction of the crucible with an oxidizing atmosphere change the structure completely and virtually eliminated visible stacking faults or twins. Similarly the addition of 1.5 atomic per cent Cu to the melt and subsequent evaporation to completion resulted in alloy films with very little regular structure. (Author).
