Magnetic properties and magnetocaloric effects of manganite (La_0.8Ho_0.2)_2/3Ca_1/3MnO₃ and (La_0.5Ho_0.5)_2/3Ca_1/3MnO₃

何宁^1,2，祁阳^1,3，张彩碚^1,3

1. Institute of Materials Physics and Chemistry,School of Sciences,Northeastern University2. China Medical University3. 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.

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