کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9803800 | 1516473 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pressure dependence of the crystal structure of SrCeO3 perovskite
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
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 κa = 3.14(8) Ã 10â3 GPaâ1, κb = 3.18(8) Ã 10â3 GPaâ1 and κc = 1.78(6) Ã 10â3 GPaâ1, 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 AIIBIVO3 perovskites in both temperature and pressure, which is attributed to the magnitude of the CeO bond length.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 394, Issues 1â2, 17 May 2005, Pages 131-137
Journal: Journal of Alloys and Compounds - Volume 394, Issues 1â2, 17 May 2005, Pages 131-137
نویسندگان
K.S. Knight, W.G. Marshall, N. Bonanos, D.J. Francis,