Heterogeneous equilibria in the Y-Mn-O and Tm-Mn-O systems in air

The subsolidus phase diagrams of the systems Ln-Mn-O (Ln = Y, Tm) in air in the range 850-1400degreesC were constructed, based on the X-ray phase analysis of the homogeneous phases and heterogeneous mixtures of compositions R = N-Mn/(N-Mn + N-Ln) 1/5, 1/2 (LnMnO(3)), 3/5, 2/3 (LnMn(2)O(5)), and 4/5. The boundaries of the phase areas were outlined.