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

Published online by Cambridge University Press:  14 November 2013

A.M.T. Bell ,
H-P. Liermann ,
J. Bednarcik  and
C.M.B. Henderson
A.M.T. Bell*
Affiliation:
Photon Science/DESY, Notkestraße 85, 22607 Hamburg, Germany
H-P. Liermann
Affiliation:
Photon Science/DESY, Notkestraße 85, 22607 Hamburg, Germany
J. Bednarcik
Affiliation:
Photon Science/DESY, Notkestraße 85, 22607 Hamburg, Germany
C.M.B. Henderson
Affiliation:
SEAES, University of Manchester, Manchester M13 9PL, UK
*
Contact author; e-mail:ynotlleb1@mac.com.

Abstract

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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.

Keywords

Rietveld refinementmineralssynchrotron radiation

Information

Type
Technical Articles
Information
Powder Diffraction , Volume 28 , Supplement S2 , September 2013 , pp. S333 - S338
Copyright
Copyright © International Centre for Diffraction Data 2013 

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