کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4742607 | 1641576 | 2008 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Elastic properties of the post-perovskite phase of Fe2O3 and implications for ultra-low velocity zones
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The properties of the post-perovskite phase of Fe2O3 have been investigated using both the generalized gradient approximation (GGA) and GGAÂ +Â U methods. The low-spin post-perovskite phase is found to have monoclinic symmetry. While GGA and GGAÂ +Â U predict very different spin transition pressures, bulk elastic properties are found to be similar. Linear mixing of the elastic properties of the post-perovskite phase of Fe2O3 with those previously calculated for the MgSiO3 phase shows that the properties of ferric-iron-enriched post-perovskite are compatible with seismic constraints for ultra-low velocity zones. Agreement with observations for ultra-low velocity zones is further increased if they are presumed to be hotter than normal mantle.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 170, Issues 3â4, November 2008, Pages 260-266
Journal: Physics of the Earth and Planetary Interiors - Volume 170, Issues 3â4, November 2008, Pages 260-266
نویسندگان
Stephen Stackhouse, John P. Brodholt,