High-pressure BaCrO3 polytypes and the 5H–BaCrO2.8 phase

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Polytypism of BaCrO3 perovskites has been investigated at 900–1100 °C and pressures up to 22 GPa. Hexagonal 5H, 4H, and 6H perovskites are observed with increasing pressure, and the cubic 3C perovskite (a=3.99503(1) Å) is observed in bulk form for the first time at 19–22 GPa. An oxygen-deficient material with limiting composition 5H–BaCrO2.8 is synthesised at 1200 °C under ambient pressure. This contains double tetrahedral Cr4+ layers and orders antiferromagnetically below 260 K with a (0 0 1/2) magnetic structure.
Original languageEnglish
Pages (from-to)236-240
Number of pages5
JournalJournal of Solid State Chemistry
Issue numberDec 2015
Early online date2 Oct 2015
Publication statusPublished - 1 Dec 2015

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