Raman spectroscopic study of the uranyl titanate mineral betafite (Ca,U)2(Ti,Nb)2O6(OH): effect of metamictization

被引：5
|
作者：
Frost, Ray L. [1 ]
Reddy, B. Jagannadha [1 ]
机构：
[1] Queensland Univ Technol, Fac Sci & Technol, Brisbane, Qld 4001, Australia
来源：
RADIATION EFFECTS AND DEFECTS IN SOLIDS | 2010年 / 165卷 / 11期
基金：
澳大利亚研究理事会;
关键词：
betafite; metamictization; holfertite; brannerite; uranyl; titanium; mineral; metamict; Raman spectroscopy; U-O bond length; MAGNESIUM-CARBONATE MINERALS; SPENT NUCLEAR-FUEL; CRYSTAL-STRUCTURE; MOLECULAR-STRUCTURE; CURITE; VANDENDRIESSCHEITE; PARAGENESIS; PHOSPHATE; SCHOEPITE; CORROSION;
D O I：
10.1080/10420150.2010.502171
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
Raman spectra of the uranyl titanate mineral betafite were obtained and related to the mineral structure. A comparison is made with the spectra of uranyl oxyhydroxide hydrates. Observed bands are attributed to the (UO2)2+ stretching and bending vibrations, U-OH bending vibrations and H2O and (OH)- stretching, bending and libration modes. U-O bond lengths in uranyls and O-H center dot center dot center dot O bond lengths are calculated from the wavenumbers assigned to the stretching vibrations. Raman bands of betafite are comparable with those of the uranyl oxyhydroxides. The mineral betafite is metamict as is evidenced by the intensity of the UO stretching and bending modes being of lower intensity than expected and by bands that are significantly broader.
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页码：868 / 875
页数：8
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