Structural, elastic and vibrational properties of celestite, SrSO4, from synchrotron x-ray diffraction, thermal diffuse scattering and Raman scattering

In order to resolve inconsistencies encountered in published data for SrSO, the elasticity and the phase stability of celestite has been studied using thermal diffuse scattering, high pressure powder synchrotron x-ray diffraction, Raman scattering and DFT calculations. The structure of SrSO is found...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2019-02, Vol.31 (5), p.055703-055703
Main Authors: Girard, Adrien, Stekiel, Michal, Spahr, Dominik, Morgenroth, Wolfgang, Wehinger, Björn, Milman, Victor, Tra Nguyen-Thanh, Mirone, Alessandro, Minelli, Arianna, Paolasini, Luigi, Bosak, Alexei, Winkler, Bjoern
Format: Article
Language:English
Subjects:
celestite
elastic tensor
elasticity
high pressure
Raman scattering
thermal diffuse scattering
x-ray diffraction
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Summary:In order to resolve inconsistencies encountered in published data for SrSO, the elasticity and the phase stability of celestite has been studied using thermal diffuse scattering, high pressure powder synchrotron x-ray diffraction, Raman scattering and DFT calculations. The structure of SrSO is found to be stable up to 62 GPa at ambient temperature. The preferred values for the components of the elastic stiffness tensor have been determined using x-ray thermal diffuse scattering and are (in GPa): , , , , , , , , . The preferred value for the bulk modulus is GPa. This work shows that thermal diffuse scattering collected at two temperatures allows the determination of the full elastic tensor of crystals with low space group symmetry.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/aaf0ef