Abstract
Single crystals of intermediates in the mixed spinel system Co 1+δV 2−δO 4(0.11 < δ < 0.56) were grown by fused-salt electrolysis in order to test the predicted application of polytungstate fluxes to the growth of solid solution intermediates. A discussion of this application is presented in terms of solubility principles previously described and application to other systems is suggested. In addition, some of the electrical transport properties of the crystals are reported and compared with previous results obtained on polycrystalline materials. A large discrepancy between activation energies obtained on polycrystalline vs. single crystal samples was found. The single crystal data is shown to be considerably more consistent with expected behavior for “mixed-valency” semi-conductors.
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