Large magnetic entropy change near room temperature in La0.7(Ca0.27Ag0.03)MnO3 perovskite
作者： JC Debnath , Rong Zeng , Jung Ho Kim , SX Dou , None
DOI: 10.1016/J.JALLCOM.2010.12.169
关键词:
摘要: Abstract In this paper, the magnetic properties and magnetocaloric effect (MCE) of La 0.7 (Ca 1− x Ag ) 0.3 MnO 3 ( = 0, 0.1, 0.2, 0.7, 1) powder samples are reported. Our polycrystalline compounds were synthesized using solid state reaction method at high temperature. Magnetization measurements versus temperature showed that all our exhibited a paramagnetic to ferromagnetic transition with decreasing The Curie temperature, T C , has been found increase from ∼250 K for = 0–270 K = 1. doping weakens first order phase transition, higher doping, is second order. For 0.27 0.03 )MnO composition, maxima entropy changes applied field (Δ S M 2 5 T about 4.5 7.75 J/kg K, respectively, ∼263 K. relative cooling power (RCP) values without hysteresis loss 102 271 J/kg fields 5 T, respectively. Due large Δ RCP, promising application in potential refrigeration near room
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