• QIONG WU

      Articles written in Bulletin of Materials Science

    • Structure, magnetic and magnetocaloric properties of Pr$_{0.5}$Sr$_{0.5}$MnO$_3$ with cobalt substitution

      XINYAO LUO HANGFU YANG SIHAO HUA QIONG WU NENGJUN YU YUNDAN YU PENGYUE ZHANG HONGLIANG GE

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      We experimentally study the structure, magnetic and magnetocaloric effect of Pr$_{0.5}$Sr${0.5}$Mn$_{1–x}$Co$_x$O$_3$ (0.00${\leq}$x${\leq}$ 0.08) with the substitution of Co. The results of the refined XRD data show that all the samples have a tetragonal structure with the I4/mcm space group. The small amount of Co substitution does not change the structure of the materials. However, the magnetization data indicate that the charge-ordered antiferromagnetic state vanishes with a small amount of Co substitution. The Curie temperature of samples can be effectively tuned with the substitution and it decreases from 270 to 175 K. With a magnetic field change of 15 kOe, the maximum magnetic entropy change (|${\varDelta}$$S$$_M$|max)of the samples increases to 1.21 J kg$^{-1}$ K$^{-1}$ at $T$$_C$ = 255 K for x = 0.02, and then decrease monotonically. All samples undergo second-order phase transition. The wide operating range makes our compounds as good refrigeration candidates.

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