Structure cristalline de type alluaudite K0.4Na3.6Co(MoO4)3.
Identifieur interne : 000015 ( PubMed/Corpus ); précédent : 000014; suivant : 000016Structure cristalline de type alluaudite K0.4Na3.6Co(MoO4)3.
Auteurs : Rawia Nasri ; Noura Fakhar Bourguiba ; Mohamed Faouzi ZidSource :
- Acta crystallographica. Section E, Crystallographic communications ; 2015.
Abstract
A new triple molybdate, potassium sodium cobalt tris-(molybdate), K0.4Na3.6Co(MoO4)3, was synthesized using solid-state reactions. The Co(2+) and one Na(+) cation are located at the same general site, each with occupancy 0.5. Another site (site symmetry 2) is occupied by Na(+) and K(+) cations, with occupancies of 0.597 (7) and 0.402 (6), respectively. The other two Na(+) cations and one of the two Mo atoms lie on special positions (site symmetries -1, 2 and 2, respectively). The structure is characterized by M 2O10 (M = Co/Na) dimers, which are linked by MoO4 tetra-hedra, forming infinite layers. The latter are connected firstly by insertion of one type of MoO4 tetra-hedra and secondly by sharing corners with the other type of MoO4 tetra-hedra. This results in an open three-dimensional framework with the cavities occupied by the Na(+) and K(+) cations. The structure is isotypic with Na3In2As3O12 and Na3In2P3O12. A comparison is made with structures such as K2Co2(MoO4)3 and β-NaFe2(MoO4)3 and their differences are discussed.
DOI: 10.1107/S2056989014025894
PubMed: 25705436
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pubmed:25705436Le document en format XML
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<author><name sortKey="Nasri, Rawia" sort="Nasri, Rawia" uniqKey="Nasri R" first="Rawia" last="Nasri">Rawia Nasri</name>
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<author><name sortKey="Fakhar Bourguiba, Noura" sort="Fakhar Bourguiba, Noura" uniqKey="Fakhar Bourguiba N" first="Noura" last="Fakhar Bourguiba">Noura Fakhar Bourguiba</name>
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<author><name sortKey="Zid, Mohamed Faouzi" sort="Zid, Mohamed Faouzi" uniqKey="Zid M" first="Mohamed Faouzi" last="Zid">Mohamed Faouzi Zid</name>
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<author><name sortKey="Fakhar Bourguiba, Noura" sort="Fakhar Bourguiba, Noura" uniqKey="Fakhar Bourguiba N" first="Noura" last="Fakhar Bourguiba">Noura Fakhar Bourguiba</name>
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<front><div type="abstract" xml:lang="en">A new triple molybdate, potassium sodium cobalt tris-(molybdate), K0.4Na3.6Co(MoO4)3, was synthesized using solid-state reactions. The Co(2+) and one Na(+) cation are located at the same general site, each with occupancy 0.5. Another site (site symmetry 2) is occupied by Na(+) and K(+) cations, with occupancies of 0.597 (7) and 0.402 (6), respectively. The other two Na(+) cations and one of the two Mo atoms lie on special positions (site symmetries -1, 2 and 2, respectively). The structure is characterized by M 2O10 (M = Co/Na) dimers, which are linked by MoO4 tetra-hedra, forming infinite layers. The latter are connected firstly by insertion of one type of MoO4 tetra-hedra and secondly by sharing corners with the other type of MoO4 tetra-hedra. This results in an open three-dimensional framework with the cavities occupied by the Na(+) and K(+) cations. The structure is isotypic with Na3In2As3O12 and Na3In2P3O12. A comparison is made with structures such as K2Co2(MoO4)3 and β-NaFe2(MoO4)3 and their differences are discussed.</div>
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<Abstract><AbstractText>A new triple molybdate, potassium sodium cobalt tris-(molybdate), K0.4Na3.6Co(MoO4)3, was synthesized using solid-state reactions. The Co(2+) and one Na(+) cation are located at the same general site, each with occupancy 0.5. Another site (site symmetry 2) is occupied by Na(+) and K(+) cations, with occupancies of 0.597 (7) and 0.402 (6), respectively. The other two Na(+) cations and one of the two Mo atoms lie on special positions (site symmetries -1, 2 and 2, respectively). The structure is characterized by M 2O10 (M = Co/Na) dimers, which are linked by MoO4 tetra-hedra, forming infinite layers. The latter are connected firstly by insertion of one type of MoO4 tetra-hedra and secondly by sharing corners with the other type of MoO4 tetra-hedra. This results in an open three-dimensional framework with the cavities occupied by the Na(+) and K(+) cations. The structure is isotypic with Na3In2As3O12 and Na3In2P3O12. A comparison is made with structures such as K2Co2(MoO4)3 and β-NaFe2(MoO4)3 and their differences are discussed.</AbstractText>
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