資料載入中.....
|
請使用永久網址來引用或連結此文件:
http://ir.ncue.edu.tw/ir/handle/987654321/15408
|
| 題名: | Synthesis Characterization of Magnetic Properties in La0.7-xLnxPb0.3MnO3 (Ln= Pr, Nd, Gd, Dy, Sm, and Y) Perovskite Compounds |
| 作者: | Kao, M. C.;Che, H. Z.;Young, S. L.;Shen, C. Y.;Horng, Lance |
| 貢獻者: | 物理學系 |
| 關鍵詞: | Magnetization;Perovskite;Spin order;Ferromagnetism;Distortion;Suppression |
| 日期: | 2007-08
|
| 上傳時間: | 2013-02-05T02:19:41Z
|
| 出版者: | Elsevier |
| 摘要: | The influence of La substitution by rare-earth elements on the magnetization behaviors of perovskite oxides, La0.7−x Lnx Pb0.3 MnO3 (Ln=Pr, Nd, Gd, Dy, Sm and Y), is investigated. The replacement of La ion by Pr, Nd, Gd, Dy, Sm or Y results in a considerable decrease in the ferromagnetic ordering temperature TC and clearly irreversible behavior in the FC–ZFC curves showing a short-range spin order phase. The fact is in agreement with the smaller ionic radii of Pr, Nd, Gd, Dy, Sm and Y ions in contrast to La ion and the corresponding larger distortion of perovskite structures. The saturation magnetization MS increases as Pr or Nd content increases while MS decreases as Sm or Y content increases. Moreover, the saturation magnetization MS increases and then decreases as Gd or Dy content increases. These results can be explained in terms of the competition between the increase of ferromagnetically interacting spins due to the introduction of magnetic ions with f-shell electrons and suppression of ferromagnetism due to structure tuning induced by the small ionic radius of the interpolated cation into the La-site. |
| 關聯: | Journal of Alloy and Compounds, 440(1-2): 18-22 |
| 顯示於類別: | [物理學系] 期刊論文
|
文件中的檔案:
| 檔案 |
大小 | 格式 | 瀏覽次數 |
|---|
| index.html | 0Kb | HTML | 602 | 檢視/開啟 |
|
在NCUEIR中所有的資料項目都受到原著作權保護.
|
