Title

Pressure and temperature dependence of the static dielectric constants of KCl, NaCl, LiF, and MgO

Document Type

Article

Publication Date

1-1-1973

Abstract

The static dielectric constants and their pressure derivatives of KCl, NaCl, LiF, and MgO have been measured at several temperatures ranging from 15 to 295°K. The samples were prepared in the form of three-terminal parallel-plate capacitors and the dielectric constants were determined from measurements of the capacitance with a high-precision bridge. In all cases the dielectric constants decrease with temperature as does the magnitude of the pressure dependence. Effects of permanent-dipole impurities in NaCl were seen at temperatures around 20°K. The data were used to calculate the fixed-volume temperature derivative of the dielectric constants. This quantity (T)V, apparently exhibiting the effects of lattice anharmonicity, has a similar temperature dependence for all four compounds: It increases from its room-temperature value as the temperature is lowered, reaches a maximum value at TD 0.15 (D=Debye temperature), and then decreases rapidly toward zero at lower temperatures. © 1973 The American Physical Society.

Publication Name

Physical Review B

Volume Number

7

First Page

3885

Last Page

3892

Issue Number

8

DOI

10.1103/PhysRevB.7.3885

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