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

Autor(en)

Karolina Schwendtner, Uwe Kolitsch

Abstrakt

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(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

Technische Universität Wien, Naturhistorisches Museum Wien (NHM)

Journal

Acta Crystallographica. Section C: Structural Chemistry

Band

C74

Seiten

721-727

Anzahl der Seiten

7

ISSN

0108-2701

DOI

https://doi.org/10.1107/S2053229618007064

Publikationsdatum

06-2018

Peer-reviewed

Ja

ÖFOS 2012

104003 Anorganische Chemie, 104011 Materialchemie, 105113 Kristallographie

Schlagwörter

ASJC Scopus Sachgebiete

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

Link zum Portal

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