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New mixed aluminium-chromium diarsenate.

ABSTRACT: Potassium chromium aluminium diarsenate, KCr1/4Al3/4As2O7, was prepared by solid-state reaction. The structure consists of (Cr1/4/Al3/4)O6 octa-hedra and As2O7 diarsenate groups sharing corners to build up a three-dimensional anionic framework. The potassium cations are located in wide channels running along the c-axis direction. The crystal structure is isostructural with the triclinic AIMIIIX2O7 (AI = alkali metal; MIII = Al, Cr, Fe; X = As, P) compounds. However, the MIII octa-hedrally coordinated site is 25% partially occupied by chromium and 75% by aluminium.

SUBMITTER: Bouhassine MA 

PROVIDER: S-EPMC5347050 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature

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New mixed aluminium-chromium diarsenate.

Bouhassine Mohamad Alem MA   Boughzala Habib H  

Acta crystallographica. Section E, Crystallographic communications 20170210 Pt 3

Potassium chromium aluminium diarsenate, KCr<sub>1/4</sub>Al<sub>3/4</sub>As<sub>2</sub>O<sub>7</sub>, was prepared by solid-state reaction. The structure consists of (Cr<sub>1/4</sub>/Al<sub>3/4</sub>)O<sub>6</sub> octa-hedra and As<sub>2</sub>O<sub>7</sub> diarsenate groups sharing corners to build up a three-dimensional anionic framework. The potassium cations are located in wide channels running along the <i>c</i>-axis direction. The crystal structure is isostructural with the triclinic <i>A  ...[more]

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