Magnetic properties and magnetocaloric effects of manganite (La0.8Ho0.2)2/3Ca1/3MnO3 and (La0.5Ho0.5)2/3Ca1/3MnO3 |
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| Affiliation: | 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) |
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| 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. |
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| Keywords: | sol-gel magnetocaloric effects perovsvskites relative cooling power (RCP) rare earths |
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