成型压力对La0.7Sr0.3MnO3纳米固体内部缺陷结构影响的研究

郑凡磊; 隋郁; 许大鹏; 苏文辉; 郭应焕; 杨桦; 王蕴玉

doi:10.11858/gywlxb.1997.03.008

成型压力对La0.7Sr0.3MnO3纳米固体内部缺陷结构影响的研究

doi: 10.11858/gywlxb.1997.03.008

郑凡磊^1,5,,
隋郁¹,
许大鹏¹,
苏文辉^1,2,3,
郭应焕⁴,
杨桦⁴,
王蕴玉⁴

1.
吉林大学物理系，吉林长春 130023；
2.
中国科学院国际材料物理中心，辽宁沈阳 110015；
3.
中国高等科学技术中心（世界实验室）凝聚态和辐射物理分中心，北京 100080；
4.
中国科学院高能物理研究所核技术应用开发部，北京 100039；
5.
中国科学院长春物理研究所，吉林长春 130021

详细信息

通讯作者:
郑凡磊

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出版历程
- 收稿日期: 1997-02-16
- 修回日期: 1997-04-28
- 发布日期: 1997-09-05

The Effect of High Pressure on the Defect Structure inside La0.7Sr0.3MnO3 Nanosolids

1.
Department of Physics, Jilin University, Changchun 130023, China;
2.
International Center for Materials Physics, Academia Sinica, Shenyang 110015, China;
3.
Center for Condensed Matter and Radiation Physics, CCAST (world Laboratory), Beijing 100080, China;
4.
Institute of High Energy Physics, Academia Sinica, Beijing 100039, China;
5.
Changchun Institute of Physics, Academia Sinica, Changchun 130021, China

More Information

Corresponding author: ZHENG Fan-Lei

摘要

摘要: 应用溶胶凝胶法合成了平均尺寸为40 nm的La0.7Sr0.3MnO3纳米粉末，在0.2 GPa到4.5 GPa的压力范围内加压成型，制成直径6 mm，厚为1 mm的纳米固体样品。测量了不同成型压力下样品的正电子寿命谱，研究了纳米固体内部存在的三类空位缺陷随压力的变化规律。在低于1.0 GPa的情况下，三类缺陷随压力的增加变化敏感，成型压力高于1.0 GPa时，纳米固体内部的压致碎化导致十几个单空位尺寸大小的微孔洞缺陷数量的剧增，使纳米固体内部的缺陷密度增加，呈现反常的压力依赖关系。
- La0.7Sr0.3MnO3 /
- 纳米固体 /
- 正电子寿命谱 /
- 压致晶粒碎化
Abstract: In this paper, the La0.7Sr0.3MnO3 nanoparticles with average sizes of 40 nm were synthesized by sol-gel method. The La0.7Sr0.3MnO3 nanosolids were prepared by compacting the nanoparticles under high pressures from 0.2 to 4.5 GPa (6 mm1 mm). Positron-lifetime spectra of all samples were measured. Three types of vacancy defects within nanosolids and their changes with pressure were studied. When p1.0 GPa, the three types of vacancy defects are sensitive to pressure; at p1.0 GPa, the number of the microcavity defects with several single vacancies in size increased obviously because of the occurrence of pressure-induced crystallite breaking, this led to the increase of defect density within nanosolids. An abnormal change of defect structure depending on pressure was found.
- La0.7Sr0.3MnO3 /
- positron-lifetime spectra /
- nanosolids /
- pressure-induced crystallite breaking

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