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Synthesis of Ba 4 R 3 F 17 (R stands for rare-earth elements) powders and transparent compacts on their base

Synthesis of Ba 4 R 3 F 17 (R stands for rare-earth elements) powders and transparent compacts on their base,10.1134/S0036023610040029,Russian Journal

Synthesis of Ba 4 R 3 F 17 (R stands for rare-earth elements) powders and transparent compacts on their base   (Citations: 1)
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Single-phase samples of Ba4R3F17 · nH2O (R = La, Ce, Pr, Nd, Eu, Gd, Y, Er, or Yb; n = 2.5−3.2) were prepared by coprecipitation from nitrate solutions using hydrofluoric acid. The phases crystallize in a fluorite-type face-centered cubic lattice. The dried precipitates are transparent. Scanning electron and atomic-force microscopy and X-ray diffraction line broadening show a hierarchic structure in the samples: primary nanoparticles join into agglomerates with characteristic sizes of about 150–200 nm, these agglomerates being self-packed into parallel layers with a thickness on the order of 500 nm.
Journal: Russian Journal of Inorganic Chemistry - RUSS J INORG CHEM , vol. 55, no. 4, pp. 484-493, 2010
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    • ...In particular, in [8] the method of coprecipitation of single�phase Ba 4 R 3 F 17 · nH2O samples (R = La, Ce, Pr, Nd, Eu, Gd, Y, Er, Yb; n = 2.5–3.2) was elaborated when the ratio Ba : R = 4 : 3 was used in the initial solution...
    • ...The system under study resembles systems of bar� ium fluoride with rare�earth fluorides: unlike systems with calcium and strontium fluorides, fluorite solid solutions M 1– xRxF 2+ x are not formed upon chemical precipitation, but a mixture of almost pure barium flu� oride with the intermediate face�centered cubic phase is precipitated [8]...
    • ...The cubic modification is probably stabilized by adsorbed water, but, as was shown in [8], the removal of water...

    P. P. Fedorovet al. Coprecipitation of barium-bismuth fluorides from aqueous solutions: Na...

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