Model calculation of the pressure derivative of the high-frequency dielectric constant of alkali-halide crystals

1979 ◽  
Vol 20 (4) ◽  
pp. 1706-1712 ◽  
Author(s):  
Lalit K. Banerjee ◽  
A. N. Basu ◽  
S. Sengupta
Keyword(s):  
Dielectric Constant ◽  
Model Calculation ◽  
High Frequency ◽  
Alkali Halide ◽  
Pressure Derivative ◽  
High Frequency Dielectric Constant ◽  
Alkali Halide Crystals

Photoelastic behaviour and interionic potentials in alkali halide crystals

1981 ◽  
Vol 59 (10) ◽  
pp. 1359-1366 ◽  
Author(s):  
Jai Shanker ◽  
T. S. Verma ◽  
A. Cox ◽  
M. J. L. Sangster
Keyword(s):  
Shell Model ◽  
High Frequency ◽  
Alkali Halide ◽  
Dielectric Constants ◽  
Critical Test ◽  
Photoelastic Data ◽  
Comparison Of The Results ◽  
Alkali Halide Crystals ◽  
Derivatives Of ◽  
Photoelastic Behaviour

In order to make a critical test of some recently developed interionic potentials based on the shell model, the photoelastic behaviour of the alkali halide crystals has been investigated. Values of the strain derivatives of the static and high-frequency dielectric constants have been calculated from sets of potentials due to Catlow et al., Sangster et al., and Sangster and Atwood. A comparison of the results obtained with available experimental photoelastic data demonstrates the superiority of the second set of potentials of Catlow et al.

DIELECTRIC EVIDENCE FOR ACETONE HYDRATE

1963 ◽  
Vol 41 (2) ◽  
pp. 264-273 ◽  
Author(s):  
G. J. Wilson ◽  
D. W. Davidson
Keyword(s):  
Activation Energy ◽  
Dielectric Constant ◽  
High Frequency ◽  
Water System ◽  
Low Frequency ◽  
Water Molecules ◽  
Incongruent Melting ◽  
High Frequency Dielectric Constant ◽  
System A ◽  
Acetone Water

The phase diagram of the acetone–water system shows that acetone hydrate decomposes at an incongruent melting point. The existence of acetone hydrate is confirmed by a study of the low-frequency dielectric properties of this system. A dispersion region, related to the relaxation of water molecules in the clathrate structure, is characterized by a "static" dielectric constant and an activation energy about half as large as the corresponding values for ice, and by a limiting high-frequency dielectric constant of about 7 at 200° K. The magnitude of the latter is attributed to orientation of acetone molecules within the larger cavities of the hydrate structure.

High-frequency dielectric constant of layered Fe, Co, and Ni dihalides

1984 ◽  
Vol 29 (6) ◽  
pp. 3617-3622 ◽  
Author(s):  
I. Pollini ◽  
G. Benedek ◽  
J. Thomas
Keyword(s):  
Dielectric Constant ◽  
High Frequency ◽  
High Frequency Dielectric Constant
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