CaMnO2.5 and Ca2MnO3.5: New oxygen-defect perovskite-type oxides

Kenneth R Poeppelmeier, M. E. Leonowicz, J. M. Longo

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Abstract

We found that when the precursors CaMnO3 and Ca2MnO4 are reduced with any one of a variety of inorganic (H2, NH3) or organic (C2H4, C3H6) reducing agents between 300 and 500°C, topotactic reaction occurs to produce the ordered oxygen-defect phases CaMnO2.5 and Ca2MnO3.5, respectively. Orthorhombic cell constants for CaMnO2.5 are a = 5.43(1), b = 10.24(1), and c = 3.74(1) Å, and for Ca2MnO3.5 are a = 5.30(1), b = 10.05(1), and c = 12.24(1)Å. These compounds were characterized by powder X-ray diffraction, thermogravimetric analysis, magnetic susceptibility, and infrared spectroscopy. The reduced compounds reversibly oxidize to their respective precursor in oxygen at low temperatures.

Original languageEnglish
Pages (from-to)89-98
Number of pages10
JournalJournal of Solid State Chemistry
Volume44
Issue number1
DOIs
Publication statusPublished - 1982

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ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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