National Changhua University of Education Institutional Repository : Item 987654321/15392
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 6507/11669
造访人次 : 29934892      在线人数 : 507
RC Version 3.2 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜寻范围 进阶搜寻

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.ncue.edu.tw/ir/handle/987654321/15392

题名: Magnetization Processes of Polycrystalline La0.7Pb0.3Mn1-xFexO3
作者: Young, S. L.;Chen, H. Z.;Kao, M. C.;Horng, Lance;Shih, Y. T.
贡献者: 物理學系
关键词: Diffraction;Rhombohedral symmetry;Double exchange;Magnetization;Ferromagnetism
日期: 2006-08
上传时间: 2013-02-05T02:19:15Z
出版者: Elsevier
摘要: A systematic investigation of the magnetic properties in the perovskite materials La0.7Pb0.3Mn1−xFexO3 is presented in this study. The distortion induced by Mn-site substitution is not obvious as radii of Fe and Mn are similar for low Fe-content samples. Powder X-ray diffraction patterns show the same crystallographic phase of rhombohedral symmetry with space group for x⩽0.4 and change to orthorhombic symmetry with space group Pnma for x⩾0.6. The zero field cooling–field cooling curves and the values of temperature-dependence magnetization indicate ferromagnetic Mn3+–O2−–Mn4+ double-exchage interaction would be gradually replaced by antiferromagnetic Fe3+–O2−–Mn4+ and Fe3+–O2−–Fe4+ exchange coupling for x=0.6 and 0.8 and would be completely replaced by Fe3+–O2−–Fe4+ for x=1.0. From the results of experiments, the substitution of Mn by Fe suppresses the double-exchange interaction, weakens the ferromagnetism and consequently decreases the ferromagnetic transition temperature TC and saturation magnetization MS.
關聯: J. Magn. Magn. Mater., 303(2): e351-e354
显示于类别:[物理學系] 期刊論文

文件中的档案:

档案 大小格式浏览次数
index.html0KbHTML638检视/开启


在NCUEIR中所有的数据项都受到原著作权保护.

 

DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回馈