Loading...
|
Please use this identifier to cite or link to this item:
http://ir.ncue.edu.tw/ir/handle/987654321/15269
|
| Title: | Magnetization Processes of Polycrystalline La0.7Pb0.3Mn1-xFexO3 |
| Authors: | Young, S. L.;Chen, H. Z.;Kao, M. C.;Horng, L.;Shih, Yu-Tai |
| Contributors: | 物理學系 |
| Keywords: | Diffraction;Rhombohedral symmetry;Double exchange;Magnetization;Ferromagnetism |
| Date: | 2006-08
|
| Issue Date: | 2013-01-07T09:25:38Z
|
| Publisher: | Elsevier |
| Abstract: | 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. |
| Relation: | Journal of Magnetism and Magnetic Materials, 303(2): e351-e354 |
| Appears in Collections: | [物理學系] 期刊論文
|
Files in This Item:
| File |
Size | Format | |
|---|
| index.html | 0Kb | HTML | 581 | View/Open |
|
All items in NCUEIR are protected by copyright, with all rights reserved.
|
