Analysis of volume expansion data for periclase, lime, corundum and spinel at high temperatures

Bulletin of materials science

B P Singh¹  H Chandra¹  A Singh¹  R Shyam¹ 

[1]Department of Physics, Institute of Basic Sciences, Khandari, Agra-282002, India$$Department of Physics, Institute of Basic Sciences, Khandari, Agra-282002, IndiaDepartment of Physics, Institute of Basic Sciences, Khandari, Agra-282002, India$$

关键词: Volume expansion;    thermal equation of state;    thermal pressure;    geophysical minerals.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

We have presented an analysis of the volume expansion data for periclase (MgO), lime (CaO), corundum (Al₂O₃) and spinel (MgAl₂O₄) determined experimentally by Fiquet et al (1999) from 300K up to 3000K. The thermal equation of state due to Suzuki et al (1979) and Shanker et al (1997) are used to study the relationships between thermal pressure and volume expansion for the entire range of temperatures starting from room temperature up to the melting temperatures of the solids under study. Comparison of the results obtained in the present study with the corresponding experimental data reveal that the thermal pressure changes with temperature almost linearly up to quite high temperatures. At extremely high temperatures close to the melting temperatures thermal pressure deviates significantly from linearity. This prediction is consistent with other recent investigations. A quantitative analysis based on the theory of anharmonic effects has been presented to account for the nonlinear variation of the thermal pressure at high temperatures.

【 授权许可】

Unknown