压力对La0.3Bi0.2Ca0.5MnO3中晶格畸变的影响

王欣; 崔启良; 潘跃武; 邹广田; 刘景

doi:10.11858/gywlxb.2001.01.009

压力对La0.3Bi0.2Ca0.5MnO3中晶格畸变的影响

doi: 10.11858/gywlxb.2001.01.009

1.
吉林大学超硬材料国家重点实验室，吉林长春 130023；
2.
中国科学院高能物理研究所，北京 100039

详细信息

通讯作者:
王欣

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出版历程
- 收稿日期: 2000-07-17
- 修回日期: 2000-07-17
- 发布日期: 2001-03-05

Pressure Effect on Lattice Distortions of La0.3Bi0.2Ca0.5MnO3

1.
State Key Laboratory for Superhard Materials, Jilin University, Changchun 130023, China;
2.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China

More Information

Corresponding author: WANG Xin

摘要

摘要: 利用同步辐射X射线衍射技术，对La0.3Bi0.2Ca0.5MnO3中存在的Jahn-Teller畸变进行了原位的高压研究。实验表明，外加压力能有效地影响到晶格中MnO键长和MnOMn键角的变化。当压力为1.8 GPa时，在晶格中存在的两种不同畸变模式之间的相互作用下，导致了位于a-b基面上的Q2畸变模式的消失。
- La0.3Bi0.2Ca0.5MnO3 /
- Jahn-Teller畸变 /
- 同步辐射 /
- 高压X射线衍射
Abstract: In-situ high pressure behaviors of Jahn-Teller distortions in La0.3Bi0.2Ca0.5MnO3 were studied by energy dispersive X-ray diffraction. External pressure modified effectively local structural parameters such as the MnO bond distance and MnOMn bond angle, and brings about the competition between the distorted mode Q2 and Q3. With pressure increasing, mode Q3 becomes dominant while mode Q2 within the a-b basal plane disappears at ～1.8 GPa.
- La0.3Bi0.2Ca0.5MnO3 /
- Jahn-Teller distortion /
- synchrotron radiation /
- X-ray diffraction under high pressure

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参考文献(6)

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