The low temperature heat capacity of thallous bromide

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Abstract
Measurements of the specific heat of TlBr between 5 and 290 K are reported. These are believed to be accurate in an absolute sense to within 1% at 290 K, falling to 5% at 5 K. The Gruneisen parameter has been calculated as a function of temperature between 290 and 30 K, and at T=0. In spite of a similarity of gamma infinity and gamma 0 between 2 and 3, a marked variation of gamma with temperature independence of gamma in caesium halides. Thermodynamic analysis reveals features of a frequency spectrum which accord qualitatively with the concept given by an application of the shell model. The quasiharmonic approximation has been applied to the calculation of the maximum frequencies nu D(n) of the Debye distributions having the same nth moments as the spectrum in the real crystal for -3<or=n<or=6.

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