Synchrotron X-ray powder diffraction study on synthetic Sr-Fresnoite

被引：3

作者：

Bell, A. M. T. ^{[1
]}

Liermann, H-P. ^{[1
]}

Bednarcik, J. ^{[1
]}

Henderson, C. M. B. ^{[2
]}

机构：

[1] Photon Sci DESY, D-22607 Hamburg, Germany

[2] Univ Manchester, SEAES, Manchester M13 9PL, Lancs, England

来源：

POWDER DIFFRACTION | 2013年 / 28卷

关键词：

Rietveld refinement; minerals; synchrotron radiation;

D O I：

10.1017/S0885715613000936

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The Sr analogue of the mineral fresnoite (Sr2TiSi2O8) is of interest as a potential storage medium for radioactive Sr from nuclear waste. No high or low temperature crystal structure information is known on this phase. Therefore high-resolution synchrotron X-ray powder diffraction measurements have been done on a synthetic sample of Sr-fresnoite in the temperature range 87-1223K. This was done as a test experiment using the HRPD beamline P02.1 at PETRA-III, DESY. Synchrotron X-ray wavelengths of 0.2067(3)angstrom (293K and 573-1223K) and 0.2079(3)angstrom (87-499K) were used. Powder diffraction data were collected with a counting time of 30s using a PerkinElmer XRD 1621 flat panel image plate detector. CeO2 was included as an internal standard to calibrate the sample to detector distance. The P4bm tetragonal crystal structure of fresnoite (Ba2TiSi2O8) was used as a starting model for Sr-fresnoite. Small amounts of SrTiO3 and SrSiO3 were also found as impurities in this sample; therefore four-phase Rietveld refinements were done. The P4bm fresnoite structure is retained over the temperature range 87-1223K.

引用

页码：S333 / S338

页数：6

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