Magnetic Properties of Hydroxy Ni-Mica Intercalation

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Abstract
The magnetic properties of hydroxy Ni-mica intercalation complexes in which Ni forms two-dimensional lattices between mica layers have been investigated. The concentration of Ni was varied up to 21 wt%. The magnetic moment per Ni was evaluated from the Curie constants to be between 2 and 3 µB (dependent on the Ni content). Paramagnetic Curie temperatures obtained by the temperature dependence of the initial susceptibility are about 7-13 K for all the samples, while an apparent ferromagnetism is defined only for a sample with 2.6 wt% Ni by Arrott plots. These magnetic properties were explained by the formation of a Ni triad in a two-dimensional lattice because of the chemical stability of [Ni3(OH)5H2O]+ as an intercalant, and by a coaguration of triads with increasing Ni content.

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