Abstract
The heat capacity and magnetization of a spherical crystalline powder sample of MnBr2·4H2O has been determined as a function of temperature in applied magnetic fields up to 30 000 G. The H−T diagram for the magnetic transformations has been obtained from the loci of the points inflection in the derived values of the rate of change of the entropy and magnetization with temperature at constant applied magnetic field. The loci of these points of inflection exhibit an abrupt change in slope, indicative of a transition occuring in the portion of the sample having the spin axis aligned parallel with the applied field. The observed phenomena are in agreement with the data reported for optical and microwave absorption.
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