Synthesis of metastable perovskite-type YMnO{sub 3} and HoMnO{sub 3}

Journal Article · Sat Mar 01 04:00:00 EST 1997 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1996.7261· OSTI ID:569209

Brinks, H W; Fjellvag, H; Kjekshus, A ^[1]

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1. Univ. of Oslo (Norway)

Metastable, orthorhombic YMnO{sub 3} and HoMnO{sub 3} with the perovskite-type structure have been prepared by a solution-based procedure via complexation by citrates. The crystallization process has been investigated to obtain knowledge about what happens and how to control the process. Powder X-ray diffraction, thermoanalytical, and magnetic susceptibility data have been recorded for characterization of the reaction products. The oxygen partial pressure during crystallization seems to be the parameter which largely controls the yield of the metastable modification YMnO{sub 3} and HoMnO{sub 3}. The inorganic precursor appears to consist of an oxide carbonate just prior to the crystallization, however, with manganese in an average oxidation state higher than 3. The crystallization does not occur during the decomposition stage unless a parallel reduction takes place. Cation-deficient o-Y{sub 1-u}Mn{sub 1-v}O{sub 3} and Ho{sub 1-u}Mn{sub 1-v}O{sub 3} may be formed as intermediates and enhance the amount of the o-modification in an oxidizing atmosphere.

• OSTI ID: 569209
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 129; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTALLIZATION
HOLMIUM OXIDES
MAGNETIC SUSCEPTIBILITY
MANGANESE OXIDES
SYNTHESIS
X-RAY DIFFRACTION
YTTRIUM OXIDES