A. Krupska and M. Krupski
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Studies of two nickel compounds NiSiF6(6H2O and NiSnCl6(6H2O were carry out by electron paramagnetic resonance method under pressure up to 700 MPa and in the temperature range 80 - 400 K. Studies of nickel fluosilicate at low temperatures show considerable narrowing of the EPR line when the zero-field splitting parameter D passes through zero. This effect is explained by exchange interactions between ions Ni2+. For nickel chlorostannate hexahydrate the pressure dependence of D, dD/dp, is higher than for nickel fluosilicate, and this phenomenon is connected with high compressibility anisotropy of this compound. The separation of the geometrical contribution from the phonon effect is also considered for both compounds.

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