Thermoelastic properties of minerals at high temperature

Pramana

Deepika P Joshi1¹  Hem Chandra¹  Meenakashi Joshi¹  Sanjay Upadhyay¹ 

[1] Department of Physics, G.B. Pant University of Agriculture & Technology, Pantnagar 263 145, India$$

关键词: Elastic constants;    bulk modulus;    minerals.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

The knowledge of elasticity of the minerals is useful for interpreting the structure and composition of the lower mantle and also in seismic studies. The purpose of the present study is to discuss a simple and straightforward method for evaluating thermoelastic properties of minerals at high temperatures. We have extended the Kumar’s formulation by taking into the account the concept of anharmonicity in minerals above the Debye temperature (𝜃D). In our present study, we have investigated the thermophysical properties of two minerals (pyrope-rich garnet and MgAl2O4) under high temperatures and calculated the second-order elastic constant (𝐶𝑖𝑗) and bulk modulus (𝐾T) of the above minerals, in two cases first by taking Anderson–Gruneisen parameter (𝛿T) as temperature-independent and then by treating 𝛿T as temperature-dependent parameter. The results obtained when 𝛿T is temperature-dependent are in close agreement with experimental data.

【 授权许可】

Unknown