Coprecipitation from aqueous solutions to prepare binary fluoridesстатья
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Дата последнего поиска статьи во внешних источниках: 7 декабря 2013 г.
Аннотация:The synthesis of binary fluoride phases, specifically nanofluorides, by coprecipitation from aqueous solutions is considered in terms of phase equilibria. Phases have been precipitated in NaF-RF(3) systems (where R stands for a rare-earth element), MF(2)-YF(3) systems (where M = Ca, Sr, Ba), BaF(2)-ScF(3), and CaF(2)-BaF(2) systems. In the MF(2)-YF(3) systems, unordered metastable congruently soluble phases are precipitated instead of ordered fluorite-like phases. In the BaF(2)-ScF(3) system, the congruently soluble compound Ba(3)Sc(2)F(12) is precipitated. In the NaF-RF(3) systems, incongruently soluble metastable phases with a fluorite-like structure (for R = Er, Lu, Y) and the gagarinite structure (NaGdF(4)) are formed. In the CaF(2)-BaF(2) system, intermediate phases have not been formed.