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Study of Anharmonic Properties and Melting Law for Solids

Author: LiuQuan
Tutor: ChenLi
School: Anhui Normal University
Course: Atomic and Molecular Physics
Keywords: Solid High temperature and pressure Anharmonic nature Melting law
CLC: O482
Type: Master's thesis
Year: 2005
Downloads: 41
Quote: 0
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Abstract


Anharmonic nature has important practical value, it is able to give a specific mechanical thermal properties of the material under high temperature and pressure system solid melting at high temperatures are common in everyday life phenomenon and other important laws of physics research its research is a long time. use of phenomenological method anharmonic properties of solids in the macroeconomic conditions of high temperature and pressure as well as melting law has made a systematic study. the Preface section provides a brief introduction to the origin of this study, the purpose of a brief history of the anharmonic nature and melted law of study, theoretical significance and practical value of the research methods and tools, as well as paper used first chapter, from a solid concept and its basic nature, basic thermodynamic theory and particle interaction potential energy The three angle on the solid basis of knowledge of the thermodynamic properties of the introduction of the system. second chapter, on the basis of previous work based Jeanloz and Anderson proposed second grid Lin Naisen parameters q expression derived The new calculation Grüneisen parameter expressions according to the relationship between the Debye temperature and grid Lin Naisen parameters can be calculated Debye temperature expressions. bulk modulus formula proposed combination Cui-Chen Also, this chapter, and then get a new calculation of the coefficient of thermal expansion of the expression. three new expressions five NaCl, Li, Na, K and ε-Fe materials, The results showed that with the experiments very good. combination of He-Yan formula and Tallon model, gives new expressions for the elastic constants vary with temperature. calculated the secondary elastic constants of NaCl, KCl, CaF2, MgO, CaO, Mg2SiO4 six substances at different temperatures. calculated results and experimental results are kept in good agreement Chapter based Bosi diffusion force theory, on the basis of the work done by Sharma, Fang, Singh et al, the use of more accurate potential energy and ion spacing formula , and more rational method of calculating to obtain a set of improved melting theory to calculate the melting temperature of the solid to be applied to the IA-VII, IA-VII and type 49 compounds IA-VI, calculated results available small relative error between the experimental data and short, high temperature high pressure anharmonic nature and melting of solids under Law of useful discussion, and provide some new perspective for the theoretical prediction of the behavior of the system of solid matter. Of course, to get some parameters due to the use of the phenomenological theory calculation is often necessary to fit the experimental data, and sometimes the introduction of certain approximate relationship, damage the entire theory of strict careful, this further work will be meaningful closing remarks that the anharmonic nature and melted law of the research that worth to continue to explore the subject.

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