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

BELL, Anthony, LIERMANN, H-P, BEDNARCIK, J and HENDERSON, CMB (2013). Synchrotron X-ray powder diffraction study on synthetic Sr-Fresnoite. Powder Diffraction, 28 (S2), S333-S338.

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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)Å (293K and 573-1223K) and 0.2079(3)Å (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.

Item Type: Article
Uncontrolled Keywords: Inorganic & Nuclear Chemistry
Identification Number:
Page Range: S333-S338
SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 07 Jan 2019 14:21
Last Modified: 18 Mar 2021 07:05

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