Issue 6, 2003
From the journal:

Journal of Materials Chemistry

Hydrothermal synthesis, crystal structure and aqueous stability of two cadmium arsenate phases, CdNH4(HAsO4)OH and Cd5H2(AsO4)4·4H2O

Christopher D. Johnson,*a   Janet M. S. Skakle,b   Magnus G. Johnston,b   Jörg Feldmannb  and  Donald E. Macpheeb  

* Corresponding authors

a Dept of Geological Sciences, University of Durham, Science Laboratories, South Road, Durham, UK
E-mail: c.d.johnson@durham.ac.uk
Fax: +44 191 3742520
Tel: +44 1913747411

b Dept of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen, Scotland, UK

Abstract

As part of a waste immobilisation study, single crystals of two cadmium arsenate phases have been prepared by hydrothermal methods. CdNH4(HAsO4)OH is orthorhombic with space group Pnma, a = 17.682(4), b = 6.0098(12), c = 5.1917(10) Å. Cd5H2(AsO4)4·4H2O is monoclinic with space group C2/c, a = 18.382(2), b = 9.7192(13), c = 9.9791(13) Å, β = 96.369(3)°. Both structures were determined using single crystal X-ray diffraction and are isostructural with the analagous phosphates. CdNH4(HAsO4)OH easily converts to Cd5H2(AsO4)4·4H2O on reaction with water and even in moist air. The latter phase is relatively stable by comparison and can be shown to continue to crystallise from amorphous material without substantial leaching of cadmium or arsenic.

Graphical abstract: Hydrothermal synthesis, crystal structure and aqueous stability of two cadmium arsenate phases, CdNH4(HAsO4)OH and Cd5H2(AsO4)4·4H2O

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Article information

DOI
https://doi.org/10.1039/B302154H
Article type
Paper
Submitted
24 Feb 2003
Accepted
03 Apr 2003
First published
17 Apr 2003

J. Mater. Chem., 2003,13, 1429-1432

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Hydrothermal synthesis, crystal structure and aqueous stability of two cadmium arsenate phases, CdNH4(HAsO4)OH and Cd5H2(AsO4)4·4H2O

C. D. Johnson, J. M. S. Skakle, M. G. Johnston, J. Feldmann and D. E. Macphee, J. Mater. Chem., 2003, 13, 1429 DOI: 10.1039/B302154H

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