Resumo

REQUENA YANEZ, J.L. et al. Synthesis of Potassium and Calcium Uranovanadates, analogues of Carnotite and Metatyuyamunite Minerals. Rev. mex. fis. [online]. 2012, vol.58, n.3, pp.253-257. ISSN 0035-001X.

The aim of this study was to develop a synthesis of metatyuyamunite (Ca(VUO₆)₂·3-5H₂O) and carnotite (KVUO₆·1-3H₂O) under hydrothermal conditions. Also, crystals obtained from this synthesis were compared with crystals from melting method. The analyses of synthesis products were performed by X-Ray techniques. X-Ray Diffraction was used for both species identification, whereas Scanning Electron Microscopy was used to analyze their morphology and elemental composition. Both uranovanadates were positive synthesized under hydrothermal conditions; besides, their morphology presents particles agglomerates. Calcium uranovanadate agglomerates contain well-defined crystals, whereas potassium uranovanadate agglomerates consist in fine powder particles.

Palavras-chave : Uranium; carnotite; metatyuyamunite; hydrothermal synthesis; crystallization.

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