Structural phase transitions of SrF2 at high pressure

The high-pressure behavior of SrF2 has been investigated by angle-dispersive synchrotron X-ray powder diffraction measurement up to 50.3GPa at room temperature. Two phase transformations were observed at 6.8 and 29.5GPa, and the two high pressure phases were identified as orthorhombic (Pnma) phase a...

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Bibliographic Details
Published in:Journal of solid state chemistry 2012-02, Vol.186, p.231-234
Main Authors: Wang, J.S., Ma, C.L., Zhou, D., Xu, Y.S., Zhang, M.Z., Gao, W., Zhu, H.Y., Cui, Q.L.
Format: Article
Language:English
Subjects:
Bulk modulus
Compressing
Condensed matter: structure, mechanical and thermal properties
Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
Cross-disciplinary physics: materials science
rheology
Crystalline state (including molecular motions in solids)
Crystallographic aspects of phase transformations
pressure effects
Diffraction
Exact sciences and technology
High-pressure and shock-wave effects in solids and liquids
Materials science
Mechanical and acoustical properties of condensed matter
Metal matrix composites
Orthorhombic phase
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Phase transformations
Phase transition
Physics
SrF2
Structure of solids and liquids
crystallography
Synchrotron radiation
Synchrotrons
Transformations
X-rays
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Summary:The high-pressure behavior of SrF2 has been investigated by angle-dispersive synchrotron X-ray powder diffraction measurement up to 50.3GPa at room temperature. Two phase transformations were observed at 6.8 and 29.5GPa, and the two high pressure phases were identified as orthorhombic (Pnma) phase and hexagonal (P63/mmc) phase by Rietveld refinement. Upon decompression, retransformation was observed and the sample recovered under ambient conditions consisted of a mixture of cubic phase and orthorhombic phase. The compressing characteristics of SrF2 as the pressure increases were discussed, indicating higher incompressibility of SrF2 under high pressure. The high-pressure behavior of SrF2 has been investigated by angle-dispersive synchrotron X-ray powder diffraction measurement up to 50.3GPa at room temperature. [Display omitted] ► The high-pressure study on SrF2 up to 50.3GPa at room temperature. ► Two first-order phase transformations were observed at 6.8 and 29.5GPa. ► The three stable structures are confirmed by Rietveld refinements. ► The cubic and orthorhombic phase co-exist at pressures down to ambient pressure. ► The bulk modulus indicates higher incompressibility of SrF2 under high pressure.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2011.12.015