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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/33585
Record Status
Checked
Record Id
33585
Title
Pressure dependence of the crystal structure of SrCeO
3
Perovskite
Contributors
KS Knight (CCLRC Rutherford Appleton Lab./UCL)
,
WG Marshall (CCLRC Rutherford Appleton Lab.)
,
N Bonanos
,
DJ Francis (CCLRC Rutherford Appleton Lab.)
Abstract
The crystal structure of SrCeO3 perovskite, orthorhombic, space group Pmcn, has been determined from Rietveld profile refinement of neutron, time-of-flight, powder diffraction data at four pressures between 0 and 7.9 GPa. The unit cell compression behaviour is anisotropic With kappa(a) = 3.14(8) x 10(-3) GPa(-1), kappa(b) = 3.18(8) x 10(-3) GPa(-1) and kappa(c) = 1.78(6) x 10(-3) GPa(-1), and fitting the pressure dependence of the unit cell volume using a second-order Birch-Murnaghan equation of state, the bulk modulus has been determined as 110.1(6) GPa. Contrary to a model based on EXAFS results, which predicts octahedral tilting as the dominant compression mechanism in perovskites with excess A-site volume, SrCeO3 undergoes bond compression with increasing pressure in agreement with the results obtained in a recent Raman investigation. SrCeO3 behaves atypically when compared to other A(II)B(IV)O(3) perovskites in both temperature and pressure, which is attributed to the magnitude of the Ce-O bond length.
Organisation
CCLRC
,
ISIS
,
ISIS-PEARL
Keywords
Physics
,
Materials
,
ISIS 2005
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
J Alloys Comp
394, no. 1-2 (2005): 131-137.
doi:10.1016/j.jallcom.2004.11.020
2005
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