Despite the significant progress in the study of point defects in metals, some important problems still do not have unambiguous solutions. One of the most practically important questions relates to equilibrium defect concentrations. There exist two opposite viewpoints: (1) defect contributions to physical properties of metals at high temperatures are small and cannot be separated from the effects of anharmonicity; the equilibrium defect concentrations at the melting points are in the range of 10a4 to 10a3; (2) in many cases, defect contributions to the specific heat of metals are much larger than nonlinear effects of anharmonicity and can be separated without crucial errors; the equilibrium concentrations at the melting points are of the order of 10a3 in low-melting-point metals and 10a2 in high-melting-point metals. This book discusses the experimental results and theoretical considerations favoring each claim. At present, the majority of the scientific community hold the first viewpoint. Regrettably, the data supporting the second viewpoint have never been displayed and discussed together, and the criticism of this viewpoint has never included a detailed analysis. Important arguments supporting this viewpoint have appeared in the last decade. It may turn out that just calorimetric determinations provide the most reliable values of equilibrium defect concentrations in metals. In this book, the main attention is paid to equilibrium point defects in metals and their relation to thermophysical properties of metals. Along with a discussion on experimental data and theoretical estimates now available, some approaches are proposed that seem to be most suitable for settling the question. Contents:Basic Theory of Point-Defect FormationMethods for Studying Point DefectsModulation Calorimetry and Related TechniquesEnthalpy and Specific Heat of MetalsThermal Expansion of MetalsElectrical Resistivity of MetalsPositron AnnihilationOther MethodsEquilibration of Point DefectsParameters of Vacancy Formation Readership: Researchers, lecturers and students of materials science, condensed matter physics and statistical physics. Keywords:Point Defects;Vacancies;Vacancy Equilibration;Relaxation Phenomena;Thermophysical Properties;Metals;High Temperatures;Modulation Techniques;Specific Heat;Thermal Expansion;Electrical Resistivityheterodyne * frequency Converter Converter difference J lock-in *a difference frequency amplifier T frequency amplifier p amplifier V W recorder Fig. 10.2. Block diagram of setup to observe relaxation in hightemperature specific heat of metalsanbsp;...
|Title||:||Lecture Notes on Equilibrium Point Defects and Thermophysical Properties of Metals|
|Publisher||:||World Scientific - 2000-07-31|