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The low temperature heat capacities of two diamagnetic alums

✍ Scribed by D.G. Kapadnis; R. Hartmans

Publisher
Elsevier Science
Year
1956
Weight
387 KB
Volume
22
Category
Article
ISSN
0031-8914

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✦ Synopsis

A calorimetric determination of the specific heats of polycrystalline potassium aluminium alum and ammonium aluminium alum has been made in the temperature regions from 1.1 to 4.2Β°K and 14 to 20Β°K. The experimental results in the liquid helium temperature range have been represented by c~ = 3.35 x 10 -* T 3 J/mole-deg and c~ ----3.18 Γ— 10 -~ T 8 J/mole-deg respectively for the two alums. The Debye characteristic temperature computed for KA1 alum is 83.4Β°K and that for NH4A1 alum is 84.9Β°K. The observed deviations from the Debye formula of the heat capacities of a series of alums have been discussed.

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