Molten salt preparation of K-Zr ternary phosphatesстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Mixed phosphates of K and Zr have been prepared by means of the reactions of hydrated ZrOCl2 and NH4H2PO4 salts with KNO3 in the temperature range 250-550 degrees C. Molten salt reactions were studied by thermogravimetry and mass spectrometry of the evolved gases. Thermal analysis of the ternary mixture demonstrated that a strongly exothermic mass loss occurs at ca. 250 degrees C, due to the reaction producing a KHZr(PO4)(2) phase. Depending on the reaction conditions, different solids can be obtained, including dispersed zirconia superficially doped with phosphate or crystalline ternary phosphates such as KZr2(PO4)(3) of NASICON structure or the layered compound K2Zr(PO4)(2). The solids obtained were characterized by X-ray diffraction, H-1 and P-31 NMR spectroscopy. A correlation of P-31 chemical shift and the mean electronegativity of the obtained solids has been proposed.