Abstract

A specific heat investigation of nickel perchlorate hexahydrate was performed between 2 and 17 K. Lattice vibration and magnetic contributions were separated. The lattice term obeys a Debye α T 3 law, with α = 4.04 × 10 −3 J K 4 mol. The magnetic contribution comes from the splitting of the ground state triplet of the Ni 2+ ions, by axial and rhombic crystal field distortions, which can be explained by a Schottky specific heat with D = 1.72 K and E = 0.06 K.

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