Magnetocaloric effect of Sr-substituted BaFeO3 in the liquid nitrogen and natural gas temperature regions

AIP Advances - Tập 7 Số 4 - 2017
Kenji Yoshii1, Naoaki Hayashi2, Masaichiro Mizumaki3,4, Mikio Takano2
1Japan Atomic Energy Agency 1 , Sayo, Hyogo 679-5148, Japan
2Kyoto University 2 Institute for Integrated Cell-Material Sciences, , Kyoto 606-8501, Japan
3Japan Science and Technology Agency 4 CREST, , 5 Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan
4Japan Synchrotron Radiation Research Institute 3 , Sayo, Hyogo 679-5198, Japan

Tóm tắt

We have investigated the magnetocaloric effect (MCE) of Ba1-xSrxFe4+O3 (x≤0.2), a series of cubic perovskites showing a field-induced transition from helical antiferromagnetism to ferromagnetism. The maximum magnetic entropy change (-ΔSmax) at 50 kOe varies from ∼5.8 J kg-1K-1 (x=0) to ∼4.9 J kg-1K-1 (x=0.2), while the refrigerant capacity remains almost the same at ∼165 J kg-1. Interestingly, the temperature of -ΔSmax decreases from ∼116 K to ∼77 K with increasing x, providing this series of rare-earth-free oxides with potential as a magnetic refrigerant for the liquefaction of nitrogen and natural gas.

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Tập 7 Số 4

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