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Magnetic properties and magnetocaloric effects of manganite (La0.8Ho0.2)2/3Ca1/3MnO3 and (La0.5Ho0.5)2/3Ca1/3MnO3

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【作者】 何宁； 祁阳； 张彩碚；

【Author】 HE Ning1,2,QI Yang1,3,ZHANG Caibei1,3(1.Institute of Materials Physics and Chemistry,School of Sciences,Northeastern University,Shenyang 110004,China;2.China Medical University,Shenyang 110003,China;3.Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education,Northeastern University,Shenyang 110004,China)

【机构】 Institute of Materials Physics and Chemistry,School of Sciences,Northeastern University； China Medical University； Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education,Northeastern University；

【摘要】 We reported the magnetic properties and magnetocaloric effects(MCE) of(La0.8Ho0.2)2/3Ca1/3MnO3 and(La0.5Ho0.5)2/3Ca1/3MnO3 nanoparticles by sol-gel technique.With this method,we were able to obtain the samples with particle diameters ranging from 50 to 200 nm.In the(La1-xHox)2/3Ca1/3MnO3 compound,an external magnetic field induced a magnetic transition from an paramagnetic phase to a ferromagnetic phase above Ts=105-135 K,leading to magnetocaloric effects.The maximum value of ΔSM was 1.19 J/(kg·K) at 100 K and 2.03 J/(kg·K) at 152 K for a magnetic field change of 5 T.Because both samples had large relative cooling power(RCP) and wide δTFWHM,the study on systems with the(La1-xHox)2/3Ca1/3MnO3-related magnetic transitions may open an important field in searching good magnetic materials.

【Abstract】 We reported the magnetic properties and magnetocaloric effects(MCE) of(La0.8Ho0.2)2/3Ca1/3MnO3 and(La0.5Ho0.5)2/3Ca1/3MnO3 nanoparticles by sol-gel technique.With this method,we were able to obtain the samples with particle diameters ranging from 50 to 200 nm.In the(La1-xHox)2/3Ca1/3MnO3 compound,an external magnetic field induced a magnetic transition from an paramagnetic phase to a ferromagnetic phase above Ts=105-135 K,leading to magnetocaloric effects.The maximum value of ΔSM was 1.19 J/(kg·K) at 100 K and 2.03 J/(kg·K) at 152 K for a magnetic field change of 5 T.Because both samples had large relative cooling power(RCP) and wide δTFWHM,the study on systems with the(La1-xHox)2/3Ca1/3MnO3-related magnetic transitions may open an important field in searching good magnetic materials.

【关键词】 sol-gel； magnetocaloric effects； perovsvskites； relative cooling power (RCP)； rare earths；
【Key words】 sol-gel； magnetocaloric effects； perovsvskites； relative cooling power (RCP)； rare earths；
【基金】 Project supported by the National Natural Science Foundation of China (50572013)
  • 【文献出处】 Journal of Rare Earths ,稀土学报(英文版) , 编辑部邮箱 ,2010年S1期
  • 【分类号】TG132.2
  • 【被引频次】3
  • 【下载频次】41
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