Abnormal Elastic and Vibrational Behaviors of Magnetite at High Pressures

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	Abnormal Elastic and Vibrational Behaviors of Magnetite at High Pressures
	Lin, JF ; Wu, JJ ; Zhu, J ; Mao, Z ; Said, AH ; Leu, BM ; Cheng, JG ; Uwatoko, Y ; Jin, CQ ; Zhou, JS
刊名	SCIENTIFIC REPORTS
	2014
卷号	4
ISSN号	2045-2322
通讯作者	Lin, JF (reprint author), Univ Texas Austin, Jackson Sch Geosci, Dept Geol Sci, Austin, TX 78712 USA.
中文摘要	Magnetite exhibits unique electronic, magnetic, and structural properties in extreme conditions that are of great research interest. Previous studies have suggested a number of transitional models, although the nature of magnetite at high pressure remains elusive. We have studied a highly stoichiometric magnetite using inelastic X-ray scattering, X-ray diffraction and emission, and Raman spectroscopies in diamond anvil cells up to, similar to 20 GPa, while complementary electrical conductivity measurements were conducted in a cubic anvil cell up to 8.5 GPa. We have observed an elastic softening in the diagonal elastic constants (C-11 and C-44) and a hardening in the off-diagonal constant (C-12) at similar to 8 GPa where significant elastic anisotropies in longitudinal and transverse acoustic waves occur, especially along the [110] direction. An additional vibrational Raman band between the A(1g) and T-2g modes was also detected at the transition pressure. These abnormal elastic and vibrational behaviors of magnetite are attributed to the occurrence of the octahedrally-coordinated Fe2+-Fe3+-Fe2+ ions charge-ordering along the [110] direction in the inverse spinel structure. We propose a new phase diagram of magnetite in which the temperature for the metal-insulator and distorted structural transitions decreases with increasing pressure while the charge-ordering transition occurs at similar to 8 GPa and room temperature.
资助信息	DOE-BES [DE-AC02-06CH11357]; U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-AC02-06CH11357]; National Science Foundation [EAR-0622171]; Department of Energy [DE-AC02-06CH11357, DE-FG02-94ER14466]; DOE-NNSA; DOE-BES; NSF; Energy Frontier Research in Extreme Environments (EFree) Center, HPSTAR; NSF Earth Sciences [EAR-0838221]; NSF [DMR 1122603]; JSPS fellowship for foreign researchers [12F02023]; National Natural Science Foundation of China (NSFC); Ministry of Science and Technology (MOST); Collaborative Innovation Center of Quantum Matter in Beijing, China
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59693]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Lin, JF,Wu, JJ,Zhu, J,et al. Abnormal Elastic and Vibrational Behaviors of Magnetite at High Pressures[J]. SCIENTIFIC REPORTS,2014,4.
APA	Lin, JF.,Wu, JJ.,Zhu, J.,Mao, Z.,Said, AH.,...&Zhou, JS.(2014).Abnormal Elastic and Vibrational Behaviors of Magnetite at High Pressures.SCIENTIFIC REPORTS,4.
MLA	Lin, JF,et al."Abnormal Elastic and Vibrational Behaviors of Magnetite at High Pressures".SCIENTIFIC REPORTS 4(2014).