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- W2102496452 abstract "A polycrystalline single-phase sample with nominal composition Bi 24 PbO 37 was synthesized from Bi 2 O 3 and PbO by a high-temperature solid state reaction at 690 °C for 1.5 h. The compound adopts Bi 12 SiO 20 -type structure [cubic, space group I 23 (No. 197); a = 10.24957(3) Å] and was refined to R p = 7.96%, R wp = 10.4%, R exp = 8.43%, R B = 3.06%, and S = 1.23. The distributions of Pb 2+ and Bi 3+ over cationic sites based on the X-ray powder diffraction data were determined using a combination of the Rietveld refinement and bond valence calculations. The results showed that the asymmetric unit contains two mixed cation sites: the fully occupied 24 f site and the partly occupied 8 c site, with the unit-cell content (Bi 23.68 Pb 0.32 )(Bi 1.28 Pb 0.72 )O 38.48 . The structural constraints favor a preference of Pb 2+ ion for the 8 c site, i.e. only 1.3% of Bi 3+ is substituted by Pb 2+ at the 24 f site and 36% at the 8 c site. At the 24 f site, the cations are surrounded by 5 + 2 or in a very small amount by 5 + 1 + 2 oxide ions, forming a base bicapped square pyramid or a bicapped highly deformed octahedron, respectively. At the 8 c site, the cations with three oxide ions form a trigonal pyramid with the cations at the apex." @default.
- W2102496452 created "2016-06-24" @default.
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- W2102496452 date "2012-03-01" @default.
- W2102496452 modified "2023-09-24" @default.
- W2102496452 title "Improved structural model of Pb-doped γ-Bi2O3: (Bi23.68Pb0.32)(Bi1.28Pb0.72)O38.48" @default.
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- W2102496452 doi "https://doi.org/10.1017/s0885715612000073" @default.
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