Abstract
Barium rhodium oxide, BaRhO 3, was prepared at 1175°C and 60–65 kbar by the reaction of BaO 2 and RhO 2. A hexagonal black platelet obtained in the reaction product was found to possess a four-layer stacking sequence in space group P6 3 mmc having hexagonal unit cell parameters a = 5.744(1), c = 9.642(1) Å. The structure was detemined from 707 independent reflections of which 224 were considered observed. Averaging equivalent reflections yielded 132 unique observed reflections. Refinement of the structure by least-squares methods gave a conventional R value of 4.4%. The structure consists of a four-layer stacking sequence of close-packed BaO 3 layers containing tetravalent rhodium in all the octahedral oxygen interstices. The compound was found to be isostructural with previously reported Ba MO 3 phases. This is the first single-crystal refinement of the 4 H polytype using a four-circle diffractometer.
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