Abnormal Elastic and Vibrational Behaviors of Magnetite at High Pressures
文献类型：期刊论文
| 作者 | Lin, JF ; Wu, JJ ; Zhu, J ; Mao, Z ; Said, AH ; Leu, BM ; Cheng, JG ; Uwatoko, Y ; Jin, CQ ; Zhou, JS |
| 刊名 | SCIENTIFIC REPORTS
 |
| 出版日期 | 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 |
| 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). |
入库方式： OAI收割
来源：物理研究所
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