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• W1990325403 abstract "Barium and strontium zirconates and niobates were prepared by means of an economic and ecologic aqueous solution-gel route with high compositional flexibility. The synthesis of precursor solutions and gels, and thermal analysis of the gels are presented. The crystallization of the different oxides was studied in situ using high-temperature X-ray diffraction measurements (HT-XRD). Zirconate crystallization was observed between 600 deg. C and 700 deg. C. Small amounts of Ba(II)- and Sr(II)-carbonate crystallized before the oxide did, and decomposed between 700 deg. C and 800 deg. C. More sensitive Fourier transform infrared spectra, showed that very small traces of carbonate remain at 900 deg. C. The crystallization behavior of strontium niobates was strongly dependent on the Sr:Nb ratios, as observed in HT-XRD. Phase pure SrNb{sub 2}O{sub 6} was obtained at low temperature (600 deg. C). Sr{sub 2}Nb{sub 2}O{sub 7} and Sr{sub 5}Nb{sub 4}O{sub 15} were formed at 900 deg. C from an intermediate phase, with a minor secondary phase. Nb{sub 2}Sr{sub 4}O{sub 9} crystallized at 600 deg. C, but transformed to a mixture of phases at high temperature (1000 deg. C). By off-line furnace annealing, phase pure strontium niobates of all four compositions were obtained. The presented work demonstrates the highmore » compositional flexibility of the aqueous solution-gel route, allowing fast synthesis of different multimetal oxides with high purity.« less" @default.
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• W1990325403 date "2009-04-01" @default.
• W1990325403 modified "2023-09-26" @default.
• W1990325403 title "Crystallization of alkaline earth zirconates and niobates from compositionally flexible aqueous solution-gel syntheses" @default.
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• W1990325403 doi "https://doi.org/10.1016/j.materresbull.2008.09.035" @default.
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