Počet záznamů: 1  

The crystal chemistry of the uranyl carbonate mineral grimselite, (K,Na).sub.3./sub.Na[(UO.sub.2./sub.)(CO.sub.3./sub.).sub.3./sub.](H.sub.2./sub.O), from Jáchymov, Czech Republic

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    0379239 - FZÚ 2013 RIV GB eng J - Článek v odborném periodiku
    Plášil, J. - Fejfarová, Karla - Skála, Roman - Škoda, R. - Meisser, N. - Hloušek, J. - Císařová, I. - Dušek, Michal - Veselovský, F. - Čejka, J. - Sejkora, J. - Ondruš, P.
    The crystal chemistry of the uranyl carbonate mineral grimselite, (K,Na)3Na[(UO2)(CO3)3](H2O), from Jáchymov, Czech Republic.
    Mineralogical Magazine. Roč. 76, č. 3 (2012), s. 443-453. ISSN 0026-461X. E-ISSN 1471-8022
    Grant CEP: GA ČR(CZ) GAP204/11/0809
    Výzkumný záměr: CEZ:AV0Z10100521; CEZ:AV0Z30130516
    Klíčová slova: uranyl carbonate * grimselite * crystal structure * chemical composition * Jáchymov
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 2.212, rok: 2012

    Two crystals of the uranyl carbonate mineral grimselite, ideally K3Na[(UO2)(CO3)3](H2O), from Jáchymov in the Czech Republic were studied by single-crystal X-ray diffraction and electron-probe microanalysis. One crystal has considerably more Na than the ideal chemical composition due to substitution of Na into KO8 polyhedra; the composition of the other crystal is nearer to ideal, and similar to synthetic grimselite. The presence of Na atoms in KO8 polyhedra, which are located in channels in the crystal structure, reduces their volume, and as a result the unit-cell volume also decreases. Structure refinement shows that the formula for the sample with the anomalously high Na content is (K2.43Na0.57)<Σ3.00Na[(UO2)(CO3)3](H2O).
    Trvalý link: http://hdl.handle.net/11104/0210494

     
     
Počet záznamů: 1  

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