期刊
PHYSICAL REVIEW B
卷 83, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.224113
关键词
-
资金
- DOE [DE-FG02-07ER46402, DE-FG02-07ER46382]
- COMPRES
- Consortium for Materials Properties Research in Earth Sciences under NSF [EAR01-35554]
- US Department of Energy (DOE-BES and NNSA/CDAC)
- US Department of Energy - Geosciences [DE-FG02-92ER14244]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- Office of Science of the US DOE [DE-AC02-05CH11231]
Structural changes in RMnO3 (R = Y, Ho, Lu) under high pressure were examined by synchrotron x-ray diffraction methods at room temperature. Compression occurs more readily in the ab plane than along the c axis. With increased pressure, a pressure-induced hexagonal to orthorhombic phase transition was observed starting at similar to 22 GPa for Lu(Y)MnO3. When the pressure is increased to 35 GPa, a small volume fraction of Lu(Y)MnO3 is converted to the orthorhombic phase and the orthorhombic phase is maintained on pressure release. High-pressure infrared absorption spectroscopy and Mn K-edge near-edge x-ray absorption spectroscopy confirm that the hexagonal P6(3)cm structure is stable below similar to 20 GPa and the environment around the Mn ion is not changed. Shifts in the unoccupied p-band density of states with pressure are observed in the Mn K-edge spectra. A schematic pressure-temperature phase diagram is given for the small ion RMnO3 system.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据