Magnetism and Magnetocaloric Properties of Mn₃Zn_1-xSn_xC and Mn_3-xCr_xZnC Compounds

Naikun Sun 1),Yaobiao Li 2),Feng Liu 1) and Tongbo Ji 2) 1) School of Science,Shenyang Ligong University,Shenyang 110159,China 2) Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China

摘 要：Upon substitution of Sn for Zn,the Curie temperature of Mn 3 ZnC is lowered from 380 to 375 K for Mn 3 Zn 0.95 Sn 0.05 C and to 305 K for Mn 3 Zn 0.75 Sn 0.25 C.In accordance with the second-order ferromagneticparamagnetic transition,a room-temperature magnetocaloric effect without thermal and magnetic hysteresis is observed over a wide temperature range.The maximum value of the magnetic-entropy change S M for a magnetic-field change from 0 to 5 T is 2.42 J.kg 1.K 1 at 386 K for Mn 3 Zn 0.95 Sn 0.05 C and 1.70 J.kg 1.K 1 at 308 K for Mn 3 Zn 0.75 Sn 0.25 C.Meanwhile,substitution of Cr for Mn lowers the temperature of ferromagneticferrimagnetic transition from 233 K for Mn 3 ZnC to 230 K for Mn 2.9 Cr 0.1 ZnC and to 175 K for Mn 2.1 Cr 0.9 ZnC.An inverse magnetocaloric effect with S M equal to 0.28 J.kg 1.K 1 at 223 K for a field change from 0 to 1.47 T is observed for Mn 2.9 Cr 0.1 ZnC.

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