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Sihao Hua,Pengyue Zhang,Hangfu Yang,Suyin Zhang,Hongliang Ge 한국자기학회 2013 Journal of Magnetics Vol.18 No.1
This paper studies the effects of the Mn-site substitution by nickel on the magnetic properties and the magnetocaloric properties of La0.7Ca0.3Mn1-xNixO₃ (x = 0, 0.05 and 0.1). The orthorhombic crystal structures of the samples are confirmed by the room temperature X-ray diffraction. The dependence of the Curie temperature (TC) and the magnetic entropy change (ΔSM) on the Ni doping content was investigated. The samples with x = 0 had the first order phase transition, while the samples with x = 0.05 and 0.1 had the second order phase transition. As the concentration of Ni increased, the maximum entropy change (|ΔSM|max) decreased gradually, from 2.78 Jㆍ㎏?¹ㆍK?¹ (x = 0) to 1.02 Jㆍ㎏?¹ㆍK?¹ (x = 0.1), in a magnetic field change of 15 kOe. The measured value of TC was 185 K, 150 K and 145 K for x = 0, 0.05 and 0.1, respectively. The phase transition temperatures became wider as x increased. It indicates that the Mn-site substitution by Ni may be used to tailor the Curie temperature in La0.7Ca0.3Mn1-xNixO₃.
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Sihao Hua,Pengyue Zhang,Hangfu Yang,Suyin Zhang,Hongliang Ge 한국자기학회 2013 Journal of Magnetics Vol.18 No.4
This paper studies the effects of A-site substitution by barium on the magnetic and magnetocaloric properties of Pr0.5Sr0.5-xBaxMnO₃ (x = 0, 0.04, 0.08 and 0.1). The tetragonal crystal structures of the samples are confirmed by room temperature X-ray diffraction. The dependence of the Curie temperature (TC) and the magnetic entropy change (ΔSM) on the Ba doping content has been investigated. The samples of all doping contents undergo the second order phase transition. As the concentration of Ba increased, the maximum entropy change (|ΔSM|max) increased gradually, from 1.15 J kg<SUP>?1</SUP> K<SUP>?1</SUP> (x = 0) to 1.36 J kg<SUP>?1</SUP> K<SUP>?1</SUP> (x = 0.1), in a magnetic field change of 1.5 T. The measured value of TC is 265 K, 275 K, 260 K and 250 K for x = 0, 0.04, 0.08 and 0.1, respectively. If combining these samples for magnetic refrigeration, the temperature range of ~220 K and 290 K, where |ΔSM|max is stable at ~1.27 J kg<SUP>?1</SUP> K<SUP>?1</SUP> and RCP = 88.9 Jㆍg<SUP>?1</SUP> for ΔH = 1.5 T. Pr0.5Sr0.5-xBaxMnO₃ compounds, are expected to be suitable for magnetic-refrigeration application due to these magnetic properties.
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