TEMPERATURE-DEPENDENCE OF ELASTIC-CONSTANTS IN ALKALI-METALS

被引:43
作者
VAKS, VG [1 ]
ZAROCHENTSEV, EV [1 ]
KRAVCHUK, SP [1 ]
SAFRONOV, VP [1 ]
机构
[1] ACAD SCI UKSSR,INST ENGN PHYS,DONETSK,UKSSR
来源
JOURNAL OF PHYSICS F-METAL PHYSICS | 1978年 / 8卷 / 05期
关键词
D O I
10.1088/0305-4608/8/5/006
中图分类号
O59 [应用物理学];
学科分类号
摘要
The isothermal elastic constants Cik(T) in alkali metals are calculated in the pseudopotential model previously described. The standard second approximation in the pseudopotential and the first one in the anharmonicity are used. An expression for Cik(T) convenient for calculations is given in terms of the strain derivatives of the dynamical matrix. The results for the bulk modulus B(T) and shear constant C 44(T) agree well with experiment. The shear constants C'= 1/2(C11-C12) decrease with increasing T more rapidly than in experiment. For Li this disagreement is large and may again indicate the inadequacy of the local pseudopotential model. For the other alkali metals the discrepancies are much smaller and may be connected, at least partly, with the higher-order anharmonic contributions. The volume dependence of the elastic constants at finite T, the temperature dependence of their pressure derivatives and the sensitivity of the results to the approximations for the dielectric function are also discussed.
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页码:725 / 742
页数:18
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