首页|Giant low-field reversible magnetocaloric effect at liquid helium temperature of niobium and iron co-substituted EuTiO3 compounds
Giant low-field reversible magnetocaloric effect at liquid helium temperature of niobium and iron co-substituted EuTiO3 compounds
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Giant magnetocaloric effect(MCE)materials in the liquid helium temperature region have attracted a lot of attention in the field of low-temperature magnetic refrigeration(MR).In this study,a series of niobium(Nb)and iron(Fe)co-substituted EuTiO3 perovskites with cubic structure(space group pm3m)was successfully fabricated,and their magnetic properties as well as cryogenic magnetocaloric effects were investigated in detail.As expected,the introduction of Nb and Fe can significantly modulate the magnetic phase transition and magnetocaloric effect of the EuTiO3 compounds.With increasing Fe concentration,two local minima corresponding to the AFM-FM magnetic phase transition near 5.0 K and FM-PM transition near 10 K with no hysteresis in the thermomagnetic curves are observed,which is attrib-uted to an enhancement of FM coupling.At the same time,the gradually widened-△SM-T curves and the two peaks with a broad shoulder lead to considerable refrigeration capacity(RC).With the field change of △H=2 T,the calculated values of-△SmaxM for the EuTi0.9375-xNb0.0625FexO3(x=0.075,0.1,0.125,0.15)compounds are 24.2,17.6,14.5 and 14.0 J/(kg·K),respectively.The corresponding RC values were calculated to be 144.6,138.3,151.2 and 159 J/kg,respectively.Especially,the values of-△SmaxM for EuTi0.8625Nb0.0625Fe0.07503 are 8.6 and 15.1 J/(kg-K)under low field changes of 0.5 and 1 T,respectively.The giant low-field reversible magnetocaloric effect makes them attractive candidates for magnetic refrigeration in the liquid helium temperature region.
Zhihong Hao、Quanyi Liu、Huicai Xie、Yan Zhang、Zhaojun Mo
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School of Rare Earth and New Materials Engineering,Ganzhou Innovation Center of Rare Earth Permanent Magnet Material Advanced Manufacturing and Intelligent Equipment Technology,Gannan University of Science and Technology,Ganzhou,341000,China
Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou,341119,China
School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,030024,China
国家自然科学基金Science and Technology Research Project for Education Department of Jiangxi Province
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