Temperature variation of Grüneisen parameter in alkali metals

1980 ◽  
Vol 48 (1) ◽  
pp. 109-116
Author(s):  
L. P. Pathak ◽  
B. P. Singh ◽  
M. P. Hemkar
Keyword(s):  
Temperature Variation ◽  
Alkali Metals ◽  
Grüneisen Parameter ◽  
Gruneisen Parameter

Grüneisen parameter for liquid alkali metals

1972 ◽  
Vol 41 (2) ◽  
pp. 161-162 ◽  
Author(s):  
U.S. Tandon ◽  
S.K. Pandey
Keyword(s):  
Alkali Metals ◽  
Grüneisen Parameter ◽  
Gruneisen Parameter ◽  
Liquid Alkali Metals

Temperature variation of the Grüneisen parameter of copper

1966 ◽  
Vol 18 (1) ◽  
pp. 119-124 ◽  
Author(s):  
R. P. Gupta ◽  
P. K. Sharma ◽  
S. Pal
Keyword(s):  
Temperature Variation ◽  
Grüneisen Parameter ◽  
Gruneisen Parameter

Temperature variation of the effective Grüneisen parameter in caesium chloride structures

1963 ◽  
Vol 271 (1345) ◽  
pp. 154-169 ◽  
Keyword(s):  
Temperature Variation ◽  
Temperature Limit ◽  
Systematic Investigation ◽  
Grüneisen Parameter ◽  
Gruneisen Parameter ◽  
High Temperature Limit ◽  
Caesium Chloride ◽  
Grüneisen Parameters ◽  
The Individual ◽  
Gruneisen Parameters

A systematic investigation of the temperature variation of the effective Grüneisen parameter, γ eff. , has been carried out for the caesium chloride structure, on a model incorporating the Coulomb potential between the ions and a nearest neighbour interaction varying as r -n . As the value of n is increased from 8 to 30, the low temperature limit γ 0 of γ eff. is progressively reduced, while the high temperature limit γ ∞ increases. The value of γ 0 — γ ∞ is positive for n ≤ 15 and changes sign for n ≥ 20. Thus the trend and the extent of the temperature variation of γ eff. are sensitive to the value of n in the caesium chloride lattice. On the other hand in the NaCl lattice, the trend of the temperature variation of γ eff. is not affected by a variation of n . For n ≈ 16, the γ eff. value appears to be independent of temperature, though the individual Grüneisen parameters for the lattice frequencies vary widely. This case is an example of a type of perfect Grüneisen solid, the condition for the existence of which was given by Blackman. The Houston method with a constant normalization factor is shown to yield the correct trend of the temperature variation of γ eff. . A more elaborate normalization procedure alters the γ eff. values only slightly. Varying the ratio of the ionic masses has only a slight effect on γ( p ) and γ eff. . From the recently measured elastic data, it appears probable that the value of n pertinent to the caesium halides is about 15. n may increase slightly with increasing size of the anion. If this value of n is correct, the effective Gruneisen parameters for the caesium halides must vary only slightly with temperature. Probably one of the caesium halides will exhibit closely the behaviour of a perfect Grüneisen solid.

Thermoelastic parameters of crystals

1984 ◽  
Vol 62 (2) ◽  
pp. 109-114 ◽  
Author(s):  
V. B. L. Mehrotra ◽  
R. M. Misra ◽  
Ram Singh ◽  
D. D. Shukla ◽  
M. N. Sharma ◽  
...  
Keyword(s):  
Experimental Data ◽  
Temperature Variation ◽  
Theoretical Estimate ◽  
Pressure Variation ◽  
Potential Functions ◽  
Ionic Crystals ◽  
Grüneisen Parameter ◽  
Gruneisen Parameter ◽  
Realistic Potential ◽  
Interaction Approach

The parameters C1 = [∂(1/KT)/∂P]T, which describes the pressure variation of the compressibility, δT, the isothermal Anderson–Grüneisen parameter, and mT = (∂ ln KT/∂T)P, which describes the temperature variation of the compressibility, have been investigated for some face-centred cubic (f.c.c.) and body-centred cubic (b.c.c.) types of ionic crystals using a central force, rigid-ion interaction approach employing fewer approximations than has been usual heretofore. A theoretical estimate of these parameters is made by using thermodynamic relationships, including the expression for the parameter q that describes the volume variation of the Grüneisen parameter, and choosing a few modified and realistic potential functions. The results compare well with the available experimental data and exhibit an essential improvement over other theoretical determinations.

Low temperature Grüneisen parameter of cubic ionic crystals

1987 ◽  
Vol 43 (3) ◽  
pp. 399-411 ◽  
Author(s):  
Alicia Batana ◽  
María C. Monard ◽  
María Rosario Soriano
Keyword(s):  
Low Temperature ◽  
Ionic Crystals ◽  
Grüneisen Parameter ◽  
Gruneisen Parameter
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