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Volume dependence of thermal expansivity for hep iron

机译:庚铁热膨胀系数的体积依赖性

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It is emphasized in the present study that the earlier models for the isothermal volume dependence of thermal expansivity a, developed by Tallon, Chopelas and Boehler, Anderson and Isaak, and Liu and Chen do not satisfy the thermodynamic constraint, i.e., α→Owhen P→∞ or V→0. The volume dependence of isothermal Anderson-Gruneisen parameter δ_T has been generalized in the present study. We have formulated a relation to compute the values of volume dependence of thermal expansivity. We have calculated thermal expansivity for Thomas-Fermi model, i.e., δ_(T∞) = 2/3 for K′_∞= 5/3 and Stacey and Davis model δT_∞ = 2 for K′∞ = 3 up to a wide range of pressure 359.5 GPa for hcp iron. It is found that the present formulation satisfies the thermodynamic constraint, i.e.,α→0 when P→ ∞ or V→0.
机译:在本研究中要强调的是,由Tallon,Chopelas和Boehler,Anderson和Isaak以及Liu和Chen建立的较早模型对热膨胀系数a的等温体积依赖性不满足热力学约束,即α→Owhen P →∞或V→0。等温Anderson-Gruneisen参数δ_T的体积依赖性已在本研究中得到了概括。我们制定了一种关系来计算热膨胀率的体积依赖性值。我们已经计算出了Thomas-Fermi模型的热膨胀系数,即对于K'_∞= 5/3,δ_(T∞)= 2/3;对于K'∞= 3,Stacey and Davis模型,δT_∞= 2,直到宽hcp铁的压力范围为359.5 GPa。发现本发明的公式满足热力学约束,即当P→∞或V→0时,α→0。

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