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Préparation et structure cristalline d’un nouvel Oxyarséniate de chrome et de rubidium: Rb2Cr2O(AsO4)2

✍ Scribed by Habib Boughzala; Tahar Jouini

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
611 KB
Volume
134
Category
Article
ISSN
0022-4596

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✦ Synopsis

The rubidium oxochromium (III) arsenate Rb 2 Cr 2 O(AsO 4 ) 2 crystallizes in the Pnma (no. 62) space group with a ‫؍‬ 8.546(3) A s , b ‫؍‬ 5.665(1) A s , c ‫؍‬ 18.464(5) A s , V ‫؍‬ 893.9(4) A s 3 , Z ‫؍‬ 4, R(F 2 ) ‫؍‬ 0.037, R w (F 2 ) ‫؍‬ 0.090 for 766 reflections with F 2 > 4 (F 2 ). The structure consists of CrO 6 octahedra and AsO 4 tetrahedra sharing corners to form a two-dimensional framework. The CrO 6 octahedra are joined by edges forming puckered chains running along the [100] direction. Mixed Cr-O-As bridges link these chains together. Rb ؉ cations are located in the interlayer space.

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