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- W2316172648 abstract "Abstract The crystal structure of the spinel polymorph of Fe 2 SiO 4 , synthesized at high temperature (900°C) and high pressure (70 kbar), was studied by the Rietveld analysis of X-ray powder diffraction data collected with a Guinier-Hägg camera. The compound is cubic, space group , with cell dimension: a = 8.2413(6) Å, V = 559.8(1) Å 3 , Z = 8, Cell Wt. = 1630.2, D x = 4.835 g·cm −3 , D o = 4.75 g·cm −3 . The figure of merit is F 10 = 92(0.011, 10). The final R value is R F = 0.058. The crystal has a mixed normal-inverse spinel structure. The site occupancy refinement showed that 37.9% of the silicon was found in the octahedral site (M site), while 18.9% of the iron occupied the tetrahedral site (T site). Due to the larger displacement of Si 4+ ion by Fe 2+ ion, the positional parameter of oxygen atom (0.3689) is smaller than that of X-ray single crystal structure (0.3658), and the average Si-O bond (1.697(1)Å) is longer and Fe-O bond (2.112(1)Å) is shorter than those of X-ray single crystal structure." @default.
- W2316172648 created "2016-06-24" @default.
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- W2316172648 date "1990-12-01" @default.
- W2316172648 modified "2023-09-27" @default.
- W2316172648 title "X-Ray Powder Structural Analysis of the Spinel Polymorph of Fe2SiO4" @default.
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- W2316172648 doi "https://doi.org/10.1017/s0885715600015852" @default.
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