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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
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)
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Journal Article J Alloys Comp 394, no. 1-2 (2005): 131-137. doi:10.1016/j.jallcom.2004.11.020 2005