The crystal chemistry of the uranyl carbonate mineral grimselite, (K,Na)(3)Na[(UO2)(CO3)(3)](H2O), from Jachymov, Czech Republic

• Autoři: PLÁŠIL Jakub; FEJFAROVÁ Karla; SKALA Roman; ŠKODA Radek; MEISSER Nicolas; HLOUŠEK Jan; CÍSAŘOVÁ Ivana; DUŠEK Michal; VESELOVSKÝ František; ČEJKA Jiří; SEJKORA Jiří; ONDRUŠ Petr
• Rok publikování: 2012
• Druh: Článek v odborném periodiku
• Časopis / Zdroj: Mineralogical Magazine
• Fakulta / Pracoviště MU: Přírodovědecká fakulta
• Doi: http://dx.doi.org/10.1180/minmag.2012.076.3.01
• Obor: Fyzika pevných látek a magnetismus
• Klíčová slova: uranyl carbonate; grimselite; crystal structure; chemical composition; Jachymov
• Popis: 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)3.00Na[(UO2)(CO3)3](H2O). The unit-cell parameters, refined in space group P62c, are a = 9.2507(1), c = 8.1788(1) Angstr., V = 606.14(3) A^3 and Z = 2. The crystal structure was refined toR1 = 0.0082 and wR1 = 0.0185 with a GOF = 1.33, based on 626 observed diffraction peaks [Iobs>3sigma(I)].

Související projekty

• Interakce mezi chemickými látkami, prostředím a biologickými systémy a jejich důsledky na globální , regionální a lokální úrovni