Abstract
The subsolidus phase relations in the Y2O3-Mn3O4-CoOx system in air were investigated by X-ray powder diffraction. All the samples were prepared by solid state reaction method. There are 8 single-phases, 9 two-phase regions and 8 three-phase regions in this system. Two solid solutions, namely o-YCoxMn1-xO3-δ with a narrow range of 0.70 ≤ x ≤ 0.76 and m-YCoxMn1-xO3-δ with a wider range of 0.28 ≤ x ≤ 0.60, were found to form. o-YCoxMn1-xO3-δ crystallizes in an orthorhombic Pnma perovskite structure, while m-YCoxMn1-xO3-δ exhibits diffraction features of either monoclinic P21/n or/and orthorhombic Pnma perovskite structure. The homogeneity ranges for hexagonal YMnO3 (less than 3 at. % CoO), orthorhombic YMn2O5 (less than 4 at. % CoO) and the tetragonal spinel phase t-CoxMn3-xO4 (0-31 at. % CoO), the cubic spinel phase c-CoxMn3-xO4 (65-69 at. % CoO) were determined.
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