Abstract
A series of compound Cu2xCr2xZr2-2xSe4 with x = 0.500–0.650 were prepared by solid-state reaction in sealed quartz tubes. The Rietveld refinements of XRD patterns show that Cu2xCr2xZr2-2xSe4 forms a solid solution of a single phase with the spinel structure (space group Fd3‾m). The lattice parameter (a) gradually decreases with increasing x from 0.500 to 0.625 but does not follow Vegard's law. Later, a increases for x > 0.625. Our investigation revealed the development of clusters with short metal-metal distances. The variation of the cation distribution is discussed as per site preference and the Zr substitution. The magnetic properties of Cu2xCr2xZr2-2xSe4 have been investigated for x = 0.525, 0.600, and 0.625 compositions using SQUID magnetometer. Temperature-dependent magnetic susceptibility indicates a spin-glass for x = 0.525 and 0.600 compositions, but a ferromagnetic ground state for x = 0.625 composition.
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