The specific heats of ferrous and zinc ammonium sulphates have been measured from 2 to 30°K; the difference between these gives the anomalous contribution of the ferrous ion. Two maxima are found in this latter quantity, these occurring at 3.8 and 20.3°K. A scheme of energy levels capable of explaining the anomaly is put forward and the question of its uniqueness discussed.
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Hill et al. (1953) studied this question.
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