Diffraction And Imaging Techniques In Material Science P1

Diffraction and Imaging Techniques in Material Science describes the various methods used to study the atomic structure of matter at an atomic scale based on the interaction between matter and radiation. It classifies the possible methods of observation by making a list of radiations on the basis of wavelength, including ions, X-ray photons, neutrons, and electrons. It also discusses transmission electron microscopy, the weak-beam method of electron microscopy, and some applications of transmission electron microscopy to phase transitions. Organized into 13 chapters, this volume begins with an overview of the kinematic theory of electron diffraction and the ways to treat diffraction by a deformed crystal. It discusses the dynamical theory of diffraction of fast electrons, the treatment of absorption in the dynamical theory of electron diffraction, the use of electron microscopy to study planar interfaces, and analysis of weak-beam images. The book also covers the use of computed electron micrographs in defect identification, crystallographic analysis of dislocation loops containing shear components, and detection and identification of small coherent particles. In addition, the reader is introduced to interpretation of diffuse scattering and short-range order, along with the crystallography of martensitic transformations. The remaining chapters focus on the working principle of the transmission electron microscope, experimental structure imaging of crystals, and the study of diffuse scattering effects originating from substitutional disorder and displacement disorder. The information on diffraction and imaging techniques in material science contained in this book will be helpful to students, researchers, and scientists.

Diffraction and Imaging Techniques in Material Science reviews recent developments in diffraction and imaging techniques used in the study of materials. It discusses advances in high-voltage electron microscopy, low-energy electron diffraction (LEED), X-ray and neutron diffraction, X-ray topography, mirror electron microscopy, and field emission microscopy. Organized into five parts encompassing nine chapters, this volume begins with an overview of the dynamical theory of the diffraction of high-energy electrons in crystals and methodically introduces the reader to dynamical diffraction in perfect and imperfect crystals, inelastic scattering of electrons in crystals, and X-ray production. It then explores back scattering effects, the technical features of high-voltage electron microscopes, and surface characterization by LEED. Other chapters focus on the kinematical theory of X-ray diffraction, techniques and interpretation in X-ray topography, and interpretation of the contrast of the images of defects on X-ray topographs. The book also describes theory and applications of mirror electron microscopy, surface studies by field emission of electrons, field ionization and field evaporation, and gas-surface interactions before concluding with a discussion on lattice imperfections. Scientists and students taking courses on diffraction and solid-state electron microscopy will benefit from this book.

This text is a companion volume to Transmission Electron Microscopy: A Textbook for Materials Science by Williams and Carter. The aim is to extend the discussion of certain topics that are either rapidly changing at this time or that would benefit from more detailed discussion than space allowed in the primary text. World-renowned researchers have contributed chapters in their area of expertise, and the editors have carefully prepared these chapters to provide a uniform tone and treatment for this exciting material. The book features an unparalleled collection of color figures showcasing the quality and variety of chemical data that can be obtained from today’s instruments, as well as key pitfalls to avoid. As with the previous TEM text, each chapter contains two sets of questions, one for self assessment and a second more suitable for homework assignments. Throughout the book, the style follows that of Williams & Carter even when the subject matter becomes challenging—the aim is always to make the topic understandable by first-year graduate students and others who are working in the field of Materials Science Topics covered include sources, in-situ experiments, electron diffraction, Digital Micrograph, waves and holography, focal-series reconstruction and direct methods, STEM and tomography, energy-filtered TEM (EFTEM) imaging, and spectrum imaging. The range and depth of material makes this companion volume essential reading for the budding microscopist and a key reference for practicing researchers using these and related techniques.

Aims and Scope of the Book This textbook was written for advanced un dergraduate students and beginning graduate students with backgrounds in physical science. Its goal is to acquaint them, as quickly as possible, with the central concepts and some details of transmission electron microscopy (TEM) and x-ray diffractometry (XRD) that are important for the characterization of materials. The topics in this book are developed to a level appropriate for most modern materials characterization research using TEM and XRD. There are, of course, many specialties that have attained a higher level of sophistication than presented here. The content of this book has been chosen in part to provide the background needed for a transition to these research specialties, or to other techniques such as neutron diffractometry. Although the book includes many practical details and examples, it does not cover some topics important for laboratory work. Perhaps the most obvious is the omission of specimen preparation methods for TEM. Beneath the details of principle and practice lies a larger goal of unifying the concepts common to both TEM and XRD. Coherence and wave interfer ence are conceptually similar for both x-ray waves and electron wavefunctions.