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Phase equilibria in the La2O3-Ga2O3-CoO system at 1100°C

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Abstract

The phase equilibria in the La2O3-Ga2O3-CoO system have been studied at 1100°C in air, using samples prepared by a standard ceramic processing technique from oxides and by a glycine-nitrate combustion process. The composition ranges and structures of solid solutions in this system have been determined by x-ray powder diffraction: LaGa1−x Co x O3 (0 < x ≤ 0.05), LaCo1−x Ga x O3 (0 < x ≤ 0.10), La4Ga2−x Co x O9 (0 < x ≤ 0.20), Co1−x Ga2+x O4 (−0.20 ≤ x ≤ 0.05). The unit-cell parameters of the solid solutions vary little with composition, in accordance with the small difference in ionic radius between gallium and cobalt. The 1100°C section through the phase diagram of the La2O3-Ga2O3-CoO system in air is presented.

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  1. Gorki State University, pr. Lenina 51, Yekaterinburg, 620083, Russia

    A. F. Guseva & V. A. Cherepanov

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  1. A. F. Guseva
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  2. V. A. Cherepanov
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Original Russian Text © A.F. Guseva, V.A. Cherepanov, 2007, published in Neorganicheskie Materialy, 2007, Vol. 43, No. 7, pp. 838–841.

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Guseva, A.F., Cherepanov, V.A. Phase equilibria in the La2O3-Ga2O3-CoO system at 1100°C. Inorg Mater 43, 743–746 (2007). https://doi.org/10.1134/S0020168507070138

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  • DOI: https://doi.org/10.1134/S0020168507070138

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