New mixed aluminium–chromium diarsenate

Potassium chromium aluminium diarsenate, KCr(1/4)Al(3/4)As(2)O(7), was prepared by solid-state reaction. The structure consists of (Cr(1/4)/Al(3/4))O(6) octa­hedra and As(2)O(7) diarsenate groups sharing corners to build up a three-dimensional anionic framework. The potassium cations are located in...

Descripción completa

Detalles Bibliográficos
Autores principales: Bouhassine, Mohamad Alem, Boughzala, Habib
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2017
Materias:
Research Communications
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5347050/
https://www.ncbi.nlm.nih.gov/pubmed/28316805
http://dx.doi.org/10.1107/S2056989017001797
Descripción
Sumario:Potassium chromium aluminium diarsenate, KCr(1/4)Al(3/4)As(2)O(7), was prepared by solid-state reaction. The structure consists of (Cr(1/4)/Al(3/4))O(6) octa­hedra and As(2)O(7) 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 A (I) M (III) X (2)O(7) (A (I) = alkali metal; M (III) = Al, Cr, Fe; X = As, P) compounds. However, the M (III) octa­hedrally coordinated site is 25% partially occupied by chromium and 75% by aluminium.

Ejemplares similares