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The heat capacities of Tb, Lu and Y, refined by solid state electro-transport processing have been measured between 1.5 and 16K. Below 4K the results were fitted to the expression C= gamma T+AT 3 where for Tb the nuclear and magnetic contributions were first calculated and subtracted from the total heat capacity. The resultant values of gamma (mJ mol -1 K -2 ) and limiting Debye temperatures theta D (T to 0) were as follows. Tb: gamma =4.4+or-0.1, theta D =178+or-2K; Lu: gamma =6.8+or-0.1, theta D =205+or-3K; Y: gamma =8.2+or-0.1, theta D =248+or-3K. The Debye temperature was found in all instances to decrease by about 10% between 4 and 16K.
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Wells et al. (1976) studied this question.
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