Bibliographic Citation
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| DOI | 10.1016/j.jssc.2006.08.030 |
| Title | Unit-cell intergrowth of pyrochlore and hexagonal tungsten bronze structures in secondary tungsten minerals |
| Creator/Author | Grey, Ian E. [CSIRO Minerals, Box 312, Clayton South, Vic. 3169 (Australia)]. E-mail: ian.grey@csiro.au ; Birch, William D. [Geosciences Department, Museum Victoria, GPO Box 666, Melbourne, Vic. 3001 (Australia)] ; Bougerol, Catherine [Equipe CEA-CNRS NPSC SP2M/DRFMC/CEA, 17 rue des Martyrs, 38054 Grenoble (France)] ; Mills, Stuart J. [CSIRO Minerals, Box 312, Clayton South, Vic. 3169 (Australia) ; Geosciences Department, Museum Victoria, GPO Box 666, Melbourne, Vic. 3001 (Australia)] |
| Publication Date | 2006 Dec 15 |
| OSTI Identifier | OSTI ID: 20902488 |
| Other Number(s) | Journal ID: ISSN 0022-4596; JSSCBI; TRN: US07R1188064845 |
| Resource Type | Journal Article |
| Resource Relation | Journal Name: Journal of Solid State Chemistry; Journal Volume: 179; Journal Issue: 12; Other Information: DOI: 10.1016/j.jssc.2006.08.030; PII: S0022-4596(06)00470-1; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA) |
| Subject | 36 MATERIALS SCIENCE; HCP LATTICES; LAYERS; PYROCHLORE; SPACE GROUPS; TUNGSTATES; TUNGSTEN; TUNGSTEN BRONZE; TUNGSTEN OXIDES; TWINNING; WOLFRAMITE |
| Description/Abstract | Structural relations between secondary tungsten minerals with general composition A{sub x}[(W,Fe)(O,OH){sub 3}]{sub .y}H{sub 2}O are described. Phyllotungstite (A=predominantly Ca) is hexagonal, a=7.31(3)A, c=19.55(1)A, space group P6{sub 3}/mmc. Pittongite, a new secondary tungsten mineral from a wolframite deposit near Pittong in Victoria, southeastern Australia (A=predominantly Na) is hexagonal, a=7.286(1)A, c=50.49(1)A, space group P-6m2. The structures of both minerals can be described as unit-cell scale intergrowths of (111){sub py} pyrochlore slabs with pairs of hexagonal tungsten bronze (HTB) layers. In phyllotungstite, the (111){sub py} blocks have the same thickness, 6A, whereas pittongite contains pyrochlore blocks of two different thicknesses, 6 and 12A. The structures can alternatively be described in terms of chemical twinning of the pyrochlore structure on (111){sub py} oxygen planes. At the chemical twin planes, pairs of HTB layers are corner connected as in hexagonal WO{sub 3}. |
| Country of Publication | United States |
| Language | English |
| Format | Medium: X; Size: page(s) 3860-3869 |
| System Entry Date | 2009 Dec 17 |
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