Thermal Properties of Alkali Halide Crystals with the CsCl-Type Structure. : II. Analysis of Experimental Results for CsBr and CsI
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The heat capacities of CsBr and CsI, which have the CsCl-type structure, reported in part I have been analyzed in terms of the frequency spectrum of the crystal lattice and the results have been compared with those for the alkali halides with the NaCl-type structure. Following the usual procedure the n-th moments of frequency spectrum with n= 3, -2.875, -2,75, -2.5, -2, -1.5, -1, 0, 1, 2, 4, and 6 were calculated. The Debye temperatures Θ_0 and Θ_∞, and the zero-point energy were also calculated. The values of Θ_0 agreed well with Θ(elastic). The Gruneisen parameter γ(T) for both salts appears to be nearly independent of temperature. This feature is remarkably different form other alkali halides. The appreciable anharmonic effect may be interpreted as negative contribution to heat capacity for CsBr and CsI in contrast to the positive contribution for almost all other alkali halides. This effect is discussed on the assumptions of various interionic potentials and the anharmonic coefficients are also evaluated.
- 社団法人日本物理学会の論文
- 1968-08-05
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