Crystal structure of CsCrAs2O7, a new member of the diarsenate family

[摘要] Caesium chromium(III) diarsenate(V), CsCrAs2O7, was prepared by solid-state reactions. The title structure consists of isolated CrO6 octa­hedra and As2O7 diarsenate groups, sharing corners to build up a three-dimensional [CrAs2O7]− anionic framework. In this framework, channels extending parallel to [001] are present in which the ten-coordinate Cs+ ions reside. CsCrAs2O7 is isotypic with the monoclinic AIMIIIX2O7 (AI = alkali metal; MIII = Al, Cr, Fe; X = As, P) type I family of compounds crystallizing in the space group P21/c.

[学科分类] 数学（综合）

[关键词] CRYSTAL STRUCTURE;ISOTYPISM;CHROMIUM;CAESIUM;DIARSENATE;CHANNEL STRUCTURE