Spin transition of ferric iron in the calcium-ferrite type aluminous   phase

doi:10.1002/2017JB014095

CORC > 北京大学 > 地球与空间科学学院

	Spin transition of ferric iron in the calcium-ferrite type aluminous phase
	Wu, Ye ; Qin, Fei ; Wu, Xiang ; Huang, Haijun ; McCammon, Catherine A. ; Yoshino, Takashi ; Zhai, Shuangmeng ; Xiao, Yuming ; Prakapenka, Vitali B.
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2017
关键词	EQUATION-OF-STATE SUBDUCTED BASALTIC CRUST EARTHS LOWER MANTLE MID-LOWER MANTLE HIGH-PRESSURE OCEANIC-CRUST CHEMICAL HETEROGENEITY SEISMIC SCATTERERS HIGH-TEMPERATURE STISHOVITE
DOI	10.1002/2017JB014095
英文摘要	We investigated Fe-free and Fe-bearing CF phases using nuclear forward scattering and X-ray diffraction coupled with diamond anvil cells up to 80GPa at room temperature. Octahedral Fe3+ ions in the Fe-bearing CF phase undergo a high-spin to low-spin transition at 25-35GPa, accompanied by a volume reduction of similar to 2.0% and a softening of bulk sound velocity up to 17.6%. Based on the results of this study and our previous studies, both the NAL and CF phases, which account for 10-30 vol % of subducted MORB in the lower mantle, are predicted to undergo a spin transition of octahedral Fe3+ at lower mantle pressures. Spin transitions in these two aluminous phases result in an increase of density of 0.24% and a pronounced softening of bulk sound velocity up to 2.3% for subducted MORB at 25-60GPa and 300K. The anomalous elasticity region expands and moves to 30-75GPa at 1200K and the maximum of the V reduction decreases to similar to 1.8%. This anomalous elastic behavior of Fe-bearing aluminous phases across spin transition zones may be relevant in understanding the observed seismic signatures in the lower mantle.; National Science Foundation of China [41602036, U1232204, 41473056, 41322028]; Fundamental Research Funds for the Central Universities [WUT: 2016IVA079, 2017IVB062]; DOE-NNSA [DE-NA0001974]; NSF; NSF-Earth Sciences [EAR-1128799]; DOE-Geosciences [DE-FG02-94ER14466]; DOE Office of Science [DE-AC02-06CH11357]; DOE-BES/DMSE [DE-FG02-99ER45775]; SCI(E); ARTICLE; 8; 5935-5944; 122
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/471642]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Wu, Ye,Qin, Fei,Wu, Xiang,et al. Spin transition of ferric iron in the calcium-ferrite type aluminous phase[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2017.
APA	Wu, Ye.,Qin, Fei.,Wu, Xiang.,Huang, Haijun.,McCammon, Catherine A..,...&Prakapenka, Vitali B..(2017).Spin transition of ferric iron in the calcium-ferrite type aluminous phase.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH.
MLA	Wu, Ye,et al."Spin transition of ferric iron in the calcium-ferrite type aluminous phase".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH (2017).