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• W2034339940 abstract "Abstract A number of mixed perovskites of the types Ba2B′B″O6 (BaB′1/2B″1/2O3) and Ba3B*B″2O9 (BaB*1/3B″2/3O3) where B′=Gd, La, Nd, Sm, or Y; B″=Nb and B*=Ca were synthesized by a conventional calcination process, as well as by the molten salt method. The former consists of calcining appropriate mixtures of oxide or carbonate precursors in air at elevated temperatures (∼1250°C). The latter method consists of adding appropriate mixtures of oxide or carbonate precursors to a molten salt bath at relatively low temperatures (on the order of 300 to 500°C) so that the requisite compound is formed by dissolution–reprecipitation. X-ray diffraction confirmed the formation of a single-phase perovskite in each case with calcination at 1250°C. In a molten salt bath, however, all except Ba2LaNbO6 and Ba2NdNbO6 formed the perovskite structure. On the contrary, powders of Ba2LaNbO6 and Ba2NdNbO6 formed by a high-temperature calcination process readily decomposed when introduced into the molten salt bath. The formation of the requisite perovskite at a temperature as low as 350°C in a molten salt suggests that: (a) The perovskite is stable at 350°C. (b) The molten salt exhibits sufficient precursor solubility for the dissolution–reprecipitation process to occur in a reasonable time. Similarly, the decomposition of Ba2LaNbO6 and Ba2NdNbO6 in a molten salt bath shows that these materials are thermodynamically unstable at the temperature of the molten salt bath." @default.
• W2034339940 created "2016-06-24" @default.
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• W2034339940 date "1999-12-01" @default.
• W2034339940 modified "2023-09-27" @default.
• W2034339940 title "Synthesis and Thermodynamic Stability of Ba2B′B″O6 and Ba3B*B″2O9 Perovskites Using the Molten Salt Method" @default.
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• W2034339940 doi "https://doi.org/10.1006/jssc.1999.8485" @default.
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