| A Stucture—mineralogical Study of Ringwoodite |
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| 引用本文： | 傅平秋,谢鸿森,等.A Stucture—mineralogical Study of Ringwoodite[J].中国地球化学学报,1990,9(2):99-104. |
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| 作者姓名： | 傅平秋 谢鸿森 |
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| 作者单位： | InstituteofGeochemistry,AcademiaSinica |
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| 摘 要： | The powder XRD analysis of ringwoodite(γ-Fe2SiO4),which was synthesized in a II-stage anvil high-pressure capsule,was made,Its unit-cell parameter was calculated:a=8.219A,After the refinements,for several cycles,of the oxygen parameter x and the occupancy rate of Si in octahedron site,i.e.,the iversion degree u,the final result is R=0.077,when x=0.379A and u=27.5%,with the structural formula (Fe1.725 Si0.275)VI(Si0.725Fe0.275)IV O4 and atomic distances(Fe,Si)VI-O=2.022 A and (Si,Fe)IV-O=1.836A,Meanwhile,the Moessbauer spectroscopic analysis of the sample was conducted and the results obtained are in good agreement with those of X-ray structural analysis ,This paper focuses on the phase transformation and the properties of bonds of α－Fe2SiO4→γ-Fe2SiO4.
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| 关 键 词： | 矿物学研究 X射线结构分析 XRD分析 橄榄石 晶胞参数 |
A structure — mineralogical study of Ringwoodite |
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| Fu Pingqiu,Xie Hongsen,Zhang Liming.A structure — mineralogical study of Ringwoodite[J].Chinese Journal of Geochemistry,1990,9(2):99-104. |
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| Authors: | Fu Pingqiu Xie Hongsen Zhang Liming |
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| Institution: | (1) Institute of Geochemistry, Academia Sinica, China |
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| Abstract: | The powder XRD analysis of ringwoodite (γ-Fe2SiO4), which was synthesized in a II-stage anvil high — pressure capsule.was made. Its unit-cell parameter was calculated:a = 8.219 Å. After the refinements, for several cycles, of the oxygen parameterx and the occupancy rate of Si in octahedron site, i.e., the iversion degreeu, the final result is R=0.077, when x = 0.379 Å and u=27.5%, with the structural formula (Fe1.725Si0.275)VI (Si0.725Fe0.275)IVO4 and atomic distances (Fe, Si)VI-O = 2.022 Å and (Si, Fe)VI-O = 1.836 Å. Meanwhile, the Mössbauer spectroscopic analysis of the sample was conducted and the results obtained are in good agreement with those of X-ray structural analysis. This paper focuses on the phase transformation and the properties of bonds of α - Fe2 SiO4 →γ- Fe2 SiO4. |
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