Unit-cell intergrowth of pyrochlore and hexagonal tungsten bronze structures in secondary tungsten minerals
Identifieur interne : 009B17 ( Main/Exploration ); précédent : 009B16; suivant : 009B18Unit-cell intergrowth of pyrochlore and hexagonal tungsten bronze structures in secondary tungsten minerals
Auteurs : Ian E. Grey [Australie] ; William D. Birch [Australie] ; Catherine Bougerol [France] ; Stuart J. Mills [Australie]Source :
- Journal of solid state chemistry : (Print) [ 0022-4596 ] ; 2006.
Descripteurs français
- Pascal (Inist)
- Maille cristalline, Intercroissance, Minéral nouveau, Fer, Actinide, Groupe espace, Pyrochlore, Epaisseur, Effet dimensionnel, Maclage, Défaut cristallin, Macle, Structure cellulaire, Métal transition, Pyrochlores, Réseau hexagonal, Bronze tungstène, Bronzes, Tungstène oxyde, Composé minéral, Métal transition composé, W, O W, WO3, 6166.
- Wicri :
- topic : Fer, Composé minéral.
English descriptors
- KwdEn :
- Actinides, Bronze type compound, Cellular structure, Crystal defects, Crystal twin, Hexagonal lattices, Inorganic compounds, Intergrowth, Iron, New mineral, Pyrochlore, Pyrochlore type compound, Size effect, Space groups, Thickness, Transition element compounds, Transition elements, Tungsten bronze, Tungsten oxides, Twinning, Unit cell.
Abstract
Structural relations between secondary tungsten minerals with general composition Ax[(W,Fe)(O,OH)3]yH2O are described. Phyllotungstite (A = predominantly Ca) is hexagonal, a = 7.31(3)Å, c = 19.55(1)Å, space group P63/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)Å, c = 50.49(1)Å, space group P-6m2. The structures of both minerals can be described as unit-cell scale intergrowths of (111)py pyrochlore slabs with pairs of hexagonal tungsten bronze (HTB) layers. In phyllotungstite, the (111)py blocks have the same thickness, 6 Å, whereas pittongite contains pyrochlore blocks of two different thicknesses, 6 and 12 Å. The structures can alternatively be described in terms of chemical twinning of the pyrochlore structure on (111)py oxygen planes. At the chemical twin planes, pairs of HTB layers are corner connected as in hexagonal WO3.
Affiliations:
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Grey</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>CSIRO Minerals, Box 312</s1><s2>Clayton South, Vic. 3169</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Clayton South, Vic. 3169</wicri:noRegion></affiliation></author><author><name sortKey="Birch, William D" sort="Birch, William D" uniqKey="Birch W" first="William D." last="Birch">William D. Birch</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Geosciences Department, Museum Victoria, GPO Box 666</s1><s2>Melbourne, Vic. 3001</s2><s3>AUS</s3><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Melbourne, Vic. 3001</wicri:noRegion></affiliation></author><author><name sortKey="Bougerol, Catherine" sort="Bougerol, Catherine" uniqKey="Bougerol C" first="Catherine" last="Bougerol">Catherine Bougerol</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Equipe CEA-CNRS NPSC SP2M/DRFMC/CEA, 17 rue des Martyrs</s1><s2>38054 Grenoble</s2><s3>FRA</s3><sZ>3 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>38054 Grenoble</wicri:noRegion><placeName><settlement type="city">Grenoble</settlement><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region></placeName></affiliation></author><author><name sortKey="Mills, Stuart J" sort="Mills, Stuart J" uniqKey="Mills S" first="Stuart J." last="Mills">Stuart J. Mills</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>CSIRO Minerals, Box 312</s1><s2>Clayton South, Vic. 3169</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Clayton South, Vic. 3169</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Geosciences Department, Museum Victoria, GPO Box 666</s1><s2>Melbourne, Vic. 3001</s2><s3>AUS</s3><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Melbourne, Vic. 3001</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Journal of solid state chemistry : (Print)</title><title level="j" type="abbreviated">J. solid state chem. : (Print)</title><idno type="ISSN">0022-4596</idno><imprint><date when="2006">2006</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of solid state chemistry : (Print)</title><title level="j" type="abbreviated">J. solid state chem. : (Print)</title><idno type="ISSN">0022-4596</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Actinides</term><term>Bronze type compound</term><term>Cellular structure</term><term>Crystal defects</term><term>Crystal twin</term><term>Hexagonal lattices</term><term>Inorganic compounds</term><term>Intergrowth</term><term>Iron</term><term>New mineral</term><term>Pyrochlore</term><term>Pyrochlore type compound</term><term>Size effect</term><term>Space groups</term><term>Thickness</term><term>Transition element compounds</term><term>Transition elements</term><term>Tungsten bronze</term><term>Tungsten oxides</term><term>Twinning</term><term>Unit cell</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Maille cristalline</term><term>Intercroissance</term><term>Minéral nouveau</term><term>Fer</term><term>Actinide</term><term>Groupe espace</term><term>Pyrochlore</term><term>Epaisseur</term><term>Effet dimensionnel</term><term>Maclage</term><term>Défaut cristallin</term><term>Macle</term><term>Structure cellulaire</term><term>Métal transition</term><term>Pyrochlores</term><term>Réseau hexagonal</term><term>Bronze tungstène</term><term>Bronzes</term><term>Tungstène oxyde</term><term>Composé minéral</term><term>Métal transition composé</term><term>W</term><term>O W</term><term>WO3</term><term>6166</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Fer</term><term>Composé minéral</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Structural relations between secondary tungsten minerals with general composition A<sub>x</sub>[(W,Fe)(O,OH)<sub>3</sub>]<sub>y</sub>H<sub>2</sub>O are described. Phyllotungstite (A = predominantly Ca) is hexagonal, a = 7.31(3)Å, c = 19.55(1)Å, space group P6<sub>3</sub>/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)Å, c = 50.49(1)Å, space group P-6m2. The structures of both minerals can be described as unit-cell scale intergrowths of (111)<sub>py</sub> pyrochlore slabs with pairs of hexagonal tungsten bronze (HTB) layers. In phyllotungstite, the (111)<sub>py</sub> blocks have the same thickness, 6 Å, whereas pittongite contains pyrochlore blocks of two different thicknesses, 6 and 12 Å. The structures can alternatively be described in terms of chemical twinning of the pyrochlore structure on (111)<sub>py</sub> oxygen planes. At the chemical twin planes, pairs of HTB layers are corner connected as in hexagonal WO<sub>3</sub>.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Rhône-Alpes</li></region><settlement><li>Grenoble</li></settlement></list><tree><country name="Australie"><noRegion><name sortKey="Grey, Ian E" sort="Grey, Ian E" uniqKey="Grey I" first="Ian E." last="Grey">Ian E. Grey</name></noRegion><name sortKey="Birch, William D" sort="Birch, William D" uniqKey="Birch W" first="William D." last="Birch">William D. Birch</name><name sortKey="Mills, Stuart J" sort="Mills, Stuart J" uniqKey="Mills S" first="Stuart J." last="Mills">Stuart J. Mills</name><name sortKey="Mills, Stuart J" sort="Mills, Stuart J" uniqKey="Mills S" first="Stuart J." last="Mills">Stuart J. Mills</name></country><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Bougerol, Catherine" sort="Bougerol, Catherine" uniqKey="Bougerol C" first="Catherine" last="Bougerol">Catherine Bougerol</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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