Electron Diffraction and Microscopy Studies of the Structure of Grain Boundaries in Silicon. MSC Report PDF Download
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Languages : en
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The diffraction effects expected from the periodic structure of twist boundaries in Si were determined by an examination of the reciprocal lattice of these boundaries. Methods of analysis were developed to distinguish between the real diffraction spots due to the periodic boundary structure and those due to double diffraction effects. The electron microscope images for the boundaries studied in Si bicrystals frequently were complex and contained Moire fringes which provided no information on the actual boundary structure. By analyzing the electron diffraction patterns from these boundaries for the presence of new diffraction spots it was possible to show that all the .sigma.1 (001), .sigma.1 (111), and .sigma.3 (111) twist boundaries examined have a periodic structure.
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Languages : en
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Book Description
The diffraction effects expected from the periodic structure of twist boundaries in Si were determined by an examination of the reciprocal lattice of these boundaries. Methods of analysis were developed to distinguish between the real diffraction spots due to the periodic boundary structure and those due to double diffraction effects. The electron microscope images for the boundaries studied in Si bicrystals frequently were complex and contained Moire fringes which provided no information on the actual boundary structure. By analyzing the electron diffraction patterns from these boundaries for the presence of new diffraction spots it was possible to show that all the .sigma.1 (001), .sigma.1 (111), and .sigma.3 (111) twist boundaries examined have a periodic structure.
Author: Philip A. Lamarre
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Category : Diffraction
Languages : en
Pages : 314
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Category : Power resources
Languages : en
Pages : 1472
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Languages : en
Pages :
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Electron diffraction and microscopy studies supplemented by electron spectroscopic techniques such as Auger electron spectroscopy and energy dispersive x-ray spectroscopy were used to characterize the nature of grain boundary segregation in commercial grade (Mn, Zn)Fe2O4 samples containing small quantities of CaO. Chemical analyses by AES and EDAX show an enrichment of Ca near the grain boundary region. Convergent beam electron diffraction experiments show that the crystal symmetry of the spinel structure is distorted in the vicinity of the grain boundary. In-situ heating experiments in HVEM show the existence of a disordered phase at the sintering temperature. Lorentz microscopy in TEM shows the interaction of magnetic domain wall motion with grain boundaries. These chemical and structural features are correlated with electrical resistivity and magnetic permeability of the ferrites. 4 figures.
Author: Jamie Hoyt Rose
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Languages : en
Pages : 392
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Category : Aeronautics
Languages : en
Pages : 320
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Author: Cornell University. College of Engineering
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Category : Engineering
Languages : en
Pages : 2034
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Author: Valerie Randle
Publisher: CRC Press
ISBN: 9780750302357
Category : Science
Languages : en
Pages : 182
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Book Description
As the selection of material for particular engineering properties becomes increasingly important in keeping costs down, methods for evaluating material properties also become more relevant. One such method examines the geometry of grain boundaries, which reveals much about the properties of the material. Studying material properties from their geometrical measurements, The Measurement of Grain Boundary Geometry provides a framework for a specialized application of electron microscopy for metals and alloys and, by extension, for ceramics, minerals, and semiconductors. The book presents an overview of the developments in the theory of grain boundary geometry and its practical applications in material engineering. It also covers the tunneling electron microscope (TEM), experimental aspects of data collection, data processing, and examples from actual investigations. Each step of the analysis process is clearly described, from data collection through processing, analysis, representation, and display to applications. The book also includes a glossary of terms. Exploring both the experimental and analytical aspects of the subject, this practical reference guide is essential for researchers and students involved in material properties, whether in physics, materials science, metallurgy, or physical chemistry.
Author: Wilfried Reinhold Wagner
Publisher:
ISBN:
Category : Grain boundaries
Languages : en
Pages : 324
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Author: P. E. J. Flewitt
Publisher: Wiley
ISBN: 9780471979517
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
Over recent years the understanding of grain boundaries, interphase boundaries and free surfaces has advanced greatly, leading to a clear recognition that these discontinuities make a significant contribution to the physical and mechanical properties of materials from multiphase metals and alloys to electronic materials. Grain Boundaries -Their Microstructure and Chemistry discusses the interrelationship between microstructure and chemistry of the grain boundary, with particular emphasis on the influence of the environment (air, liquid and liquid metal) and composition (bulk and impurity). This highly practical volume presents a brief background to interphase and grain boundaries, before considering in detail grain boundary composition and composition changes, and how grain boundary composition affects material properties. Very recent advances in techniques such as electron energy loss spectroscopy, high-resolution transmission electron microscopy and atom probe, and the facinating new insights into grain boundary, microstructure that they have revealed, are also discussed. Grain Boundaries - Their Microstructure and Chemistry is an indispensable text for design and safety engineers in many industries, including power and aerospace, as well as for materials scientists and engineers in academia and research institutes.
