M⁺M³⁺₂As(HAsO₄)₆ and α- and β-M⁺M³⁺(HAsO₄)₂ (M⁺M³⁺= RbAl or CsFe)

Author(s)

Karolina Schwendtner, Uwe Kolitsch

Abstract

The crystal structures of hydrothermally synthesized (T = 493 K, 7-9 d) rubidium aluminium bis[hydrogen arsenate(V)], RbAl(HAsO4)(2), caesium iron bis[hydrogen arsenate(V)], CsFe(HAsO4)(2), rubidium dialuminium arsenic(V) hexakis[hydrogen arsenate(V)], RbAl2As(HAsO4)(6), and caesium diiron arsenic(V) hexakis[hydrogen arsenate(V)], CsFe2As(HAsO4)(6), were solved by single-crystal X-ray diffraction. The four compounds with the general formula M+M3+(HAsO4)(2) adopt the RbFe(HPO4)(2) structure type (R) and a closely related new structure type, which is characterized by a different stacking order of the building units, leading to noncentrosymmetric space-group symmetry R32. The second new structure type, with the general formula M+M23+As-(HAsO4)(6) (R), is also a modification of the RbFe(HPO4)(2) structure type, in which one third of the M3+O6 octahedra are replaced by AsO6 octahedra, and two thirds of the voids in the structure, which are usually filled by M+ cations, remain empty to achieve charge balance.

Organisation(s)

Department of Mineralogy and Crystallography

External organisation(s)

Technische Universität Wien, Naturhistorisches Museum Wien (NHM)

Journal

Acta Crystallographica. Section C: Structural Chemistry

Volume

C74

Pages

721-727

No. of pages

7

ISSN

0108-2701

DOI

https://doi.org/10.1107/S2053229618007064

Publication date

06-2018

Peer reviewed

Yes

Austrian Fields of Science 2012

104003 Inorganic chemistry, 104011 Materials chemistry, 105113 Crystallography

Keywords

ASJC Scopus subject areas

Condensed Matter Physics, Materials Chemistry, Inorganic Chemistry, Physical and Theoretical Chemistry

Portal url

https://ucrisportal.univie.ac.at/en/publications/1e1f3405-5132-4699-bee0-52b21f13ccf7