采用非晶态前驱体的方法在800 ℃的低温下制备出(La0.57Dy0.1)Sr0.33MnO3纳米颗粒,用XRD、HRTEM和MPMS等手段对纳米颗粒的微观结构和磁性能进行研究.XRD和ED分析表明,所有的样品都具有单相钙钛矿结构;通过对样品不同温度下等温磁场的测量和计算,发现在居里温度点(358 K) (La0.57Dy0.1)Sr0.33MnO3纳米颗粒的最大磁熵变随着磁场的增加而增加,即使在5 T磁场下也没有达到饱和;居里温度附近纳米颗粒具有较大的磁热效应和较宽的峰值温度范围,这些良好性能可能和纳米颗粒具有大的表面和界面有关.
参考文献
| [1] | Jonker G H;Van Santen J H .[J].Physica,1950,16:337. |
| [2] | Zhang X X;Tejada J;Xin Y .[J].Applied Physics Letters,1996,69:3596. |
| [3] | Zhong W;Chen W;Au C T et al.[J].Journal of Magnetism and Magnetic Materials,2003,261:238. |
| [4] | Wada H;Tanabe Y .[J].Applied Physics Letters,2001,79(04):3302. |
| [5] | Fujieda S;Fujita A;Fukamichi K et al.[J].Advanced Materials,2003,4:339. |
| [6] | Guo ZB;Du YW;Zhu JS;Huang H;Ding WP;Feng D .Large magnetic entropy change in perovskite-type manganese oxides[J].Physical review letters,1997(6):1142-1145. |
| [7] | Phan M H;Tian S B;Hong D Q et al.[J].Journal of Magnetism and Magnetic Materials,2003,258-259:309. |
| [8] | Sun Y.;Tong W.;Liu N.;Zhang YH. .Magnetocaloric effect in polycrystalline (La0.5Gd0.2)Sr0.3MnO3[J].Journal of Magnetism and Magnetic Materials,2002(1):25-28. |
| [9] | Tian S B;Phan M H;Yu S C et al.[J].Physica B,2003,327:25. |
| [10] | Chen H Y;Lin C;Dai D S .[J].Journal of Magnetism and Magnetic Materials,2003,257:254. |
| [11] | Sanchez R D;Rivs J;Vazquez C V et al.[J].Applied Physics Letters,1996,68:134. |
| [12] | Vazequez C V;Blanco M C;Lquintela M A .[J].Journal of Materials Chemistry,1998,8:991. |
| [13] | Hashimoto T;Numasawa T;Shino M et al.[J].Cryogenics,1981,21:647. |
| [14] | Foldeaki M;Chahine R;Kbose J .[J].Journal of Applied Physics,1995,77:3528. |
| [15] | Cai Zhirang;Xu Sujun;Liu Ning .Magnetocaloric Effect in Colossal Magnetoresistance Material (La_(0.6) Dy_(0.1)) Sr_(0.3) MnO_3[J].Journal of Rare Earths,2005(1):59-62. |
| [16] | Gschneidner Jr K A;Pecharsky V K .[J].Journal of Applied Physics,1999,85:5365. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%