Crystallographic Data on a New Series of Mixed Manganites of rare earths and alkaline earths

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Crystallographic Data on a New Series of Mixed Manganites of rare earths and alkaline earths

M.N. Deschizeaux Cheruy,C. Joubert-1981-01-01-OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)

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TL;DRAbstract

The synthesis of two new series of oxides: BaLn/sub 2/Mn/sub 2/O/sub 7/ and SrLn/sub 2/Fe/sub 2/O/sub 7/, where Ln is a rare earth, was performed. The experimental conditions are given along with some crystal data. The diffraction patterns show a close resemblance with those of the double-perovskite-block compounds BaLn/sub 2/Fe/sub 2/O/sub 7/ and SrLn/sub 2/Fe/sub 2/O/sub 7/. However, the c/a ratio of the tetragonal cell is somewhat larger for the manganese compounds than for the iron compounds, due to a Jahn-Teller distortion of the Mn/sup 3 +/O/sub 6/ octahedral sites.

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The synthesis of two new series of oxides: BaLn/sub 2/Mn/sub 2/O/sub 7/ and SrLn/sub 2/Fe/sub 2/O/sub 7/, where Ln is a rare earth, was performed. The experimental conditions are given along with some crystal data. The diffraction patterns show a close resemblance with those of the double-perovskite-block compounds BaLn/sub 2/Fe/sub 2/O/sub 7/ and SrLn/sub 2/Fe/sub 2/O/sub 7/. However, the c/a ratio of the tetragonal cell is somewhat larger for the manganese compounds than for the iron compounds, due to a Jahn-Teller distortion of the Mn/sup 3 +/O/sub 6/ octahedral sites.

Keywords

CrystallographyTetragonal crystal systemManganesePerovskite (structure)OctahedronX-ray crystallographyCrystal structureAlkaline earth metal

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