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Orthorhombic Inverse Perovskitic Ba3TtO (Tt = Ge, Si) as Zintl Phases

✍ Scribed by Baoquan Huang; John D. Corbett

Publisher
John Wiley and Sons
Year
1998
Tongue
German
Weight
147 KB
Volume
624
Category
Article
ISSN
0372-7874

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✦ Synopsis

The isotypic title compounds are obtained in high yield from the reactions of Ba, BaO, and Ge (Si) in welded Ta containers slowly cooled from 1100 °C. The structure of Ba 3 GeO was determined by single-crystal X-ray diffraction (orthorhombic symmetry; Pnma (No. 62); a = 7.591(1), b = 10.728(1), c = 7.551(1) A Ê ; Z = 4; R = 0.058, R w = 0.065 for 780 reflections (I > 3r(I)) with 2h max = 60°)). The structure consists of slightly deformed OBa 6 octahedra that are tilted by ≈ 14°with respect to their positions in the ideal inverse perovskite structure. These distortions optimize eight of the original twelve equal Ba±Ge distances. The ideal cubic Ca 3 SiO (a = 4.699(1) A Ê ) has also been synthesized.

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