Abstract
The solubility limits of samarium and manganese oxides in SmMnO3 are determined using x-ray diffraction analysis of Sm2 − x MnxO3 samples (0.90 ≤ x ≤ 1.20, Δx = 0.02) prepared from oxide mixtures by solid-state reactions in air between 800 and 1400°C. The composition dependences of lattice parameters are presented for samarium manganite synthesized at 1400°C. The solubility of samarium oxide in SmMnO3 is tentatively attributed to structural defects, and that of manganese oxides is interpreted in terms of structural defects, oxygen nonstoichiometry of samarium manganite, the disproportionation reaction 2Mn3+ =Mn2+ + Mn4+, and partial substitution of the resulting Mn2+ for Sm3+ on the cuboctahedral site of the perovskite structure.
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