Abstract
Two perovskite rare-earth manganites RMnO 3 ( R=Ho, Dy) were synthesized from the hydrothermal redox reactions of KMnO 4 and MnCl 2 at 250 °C and characterized by means of X-ray diffraction, scanning electron microscopy and SQUID. They are orthorhombic, whereas the hexagonal phases, which were competitive strongly with the orthorhombic phases in solid-state reactions, are avoided in the hydrothermal systems. The pure metastable manganites may serve as a model for understanding the magnetisms of Jahn–Teller distortion and charge ordering. This new synthetic approach leaves many rooms for new doped or undoped RMnO 3 compounds.
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