New mixed-valence chromium structure type: NH{sub 4}Cr(CrO{sub 4}){sub 2}
- Department of Chemistry, Inorganic Chemistry, Goeteborg University, SE-421 96 Goeteborg (Sweden)
- Department of Chemistry, Organic Chemistry, Royal Institute of Technology, SE 100 44 Stockholm (Sweden)
- Department of Chemical and Biological Engineering, Division of Material and Surface Chemistry, Subdivision of Inorganic Environmental Chemistry, Chalmers University of Technology, SE-421 96 Goeteborg (Sweden)
Synthesis and crystal structure of a new structure type of mixed Cr(III)/Cr(VI) chromates is reported. NH{sub 4}Cr(CrO{sub 4}){sub 2} was prepared from CrO{sub 3} in the presence of (NH{sub 4}){sub 2}Ce(NO{sub 3}){sub 6}. Since this is the first preparation of mixed valence ternary chromium oxides from aqueous solution, a reaction pathway for this synthesis is suggested. The crystal structure of NH{sub 4}Cr(CrO{sub 4}){sub 2} has been determined from three-dimensional X-ray data collected at low temperature, 173K. The structure belongs to the orthorhombic space group Pnma, with a=14.5206(10), b=5.4826(4), c=8.7041(7)A and Z=4. The title compound consists of corner-sharing chromium(III) octahedra and chromium(VI) tetrahedra forming a three-dimensional network with the composition [Cr(CrO{sub 4}){sub 2}]{sub n}{sup n-}, containing channels in which zigzag rows of ammonium ions balance the net charge.
- OSTI ID:
- 20784861
- Journal Information:
- Journal of Solid State Chemistry, Vol. 179, Issue 1; Other Information: DOI: 10.1016/j.jssc.2005.10.021; PII: S0022-4596(05)00478-0; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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