无机材料学报

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(La0.6Dy0.1)Sr0.3MnO3的磁热效应研究

蔡之让1 刘宁1,2; 童伟2; 徐素军2; 张裕恒2   

  1. 1. 宿州学院材料研究室, 宿州 234000; 2. 中国科学技术大学结构分析开放实验室, 合肥 230026
  • 收稿日期:2004-03-29 修回日期:2004-05-10 出版日期:2005-05-20 网络出版日期:2005-05-20

Magnetocaloric Effect of (La0.6Dy0.1)Sr0.3MnO3

CAI Zhi-Rang1; LIU Ning1,2; TONG Wei2; XU Su-Jun2; ZHANG Yu-Heng2   

  1. 1.Materials Research Laboratory; Suzhou College; Suzhou 234000; China; 2.Structure Research Laboratory; University of Science and Technology of China; Hefei 230026; China
  • Received:2004-03-29 Revised:2004-05-10 Published:2005-05-20 Online:2005-05-20

摘要: 对庞磁电阻材料(LaL0.6Dy0.1)Sr0.3MnO3的磁热效应进行了研究.通过不同温度下的等温磁化(M-H)曲线的测量和计算,发现伴随铁磁-顺磁(PM-FM)相变出现大的磁热效应,额外的磁性交换作用将导致额外的磁熵变化.结果表明,(La0.6Dy0.1)Sr0.3MnO3可以作为室温下使用的磁制冷工质候选材料.

关键词: 磁制冷, 磁热效应, 磁熵变化, 居里温度

Abstract: We present a study of magnetocaloric effect in the colossal magnetoresistance material (La0.6Dy0.1)Sr0.3MnO3. From the measurement and calculation of magnetization under various temperatures, we have discovered large magnetocaloric effect with the ferromagnetic-paramagnetic transition, additional magnetism exchange action introduces additional magnetic entropy change. This result suggests that (La0.6Dy0.01)Sr0.3MnO3 is a suitable candidate as working substances at room temperature in magnetic refrigeration technology.

Key words: magnetic refrigeration, magnetocaloric effect, magnetic entropy change, Curie temperature

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