Abstract
The specific heat of Ni(OH) 2 considered as a quasi-two-climensional antiferromagnet was measured between 4.2 K and 35 K. The result showed a very sharp peak at 25.75±0.04 K, in contrast with the previous result of Sorai et al . which had a broad peak at 24.80±0.05 K. This disagreement may result from the reason that our sample consists of particles with the bulky property while theirs does of fine particles with the size effect. The present data are cornsistent with Fisher's relation between specific heat and magnetic susceptibility. The critical indices manifested a crossover from two-dimensional Ising value to three-dimensional Ising value as temperature approached to the Neel temperature. The magnetic entropy also suggested the quasi-two-dimensionality
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