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Persistent URL http://purl.org/net/epubs/work/33585
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Record Id 33585
Title Pressure dependence of the crystal structure of SrCeO3 Perovskite
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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
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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