CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Magnetocaloric effects in Mn1.35Fe0.65P1-xSix compounds |
Geng Yao-Xiang(耿遥祥), Tegus O(特古斯)†, and Bi Li-Ge(毕力格) |
Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, Inner Mongolia Normal University, Hohhot 010022, China |
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Abstract The structural and magnetocaloric properties of Mn1.35Fe0.65P1-xSix compounds are investigated. The Si-substituted compounds, Mn1.35Fe0.65P1-xSix with x = 0.52, 0.54, 0.55, 0.56, and 0.57, are prepared by high-energy ball milling and the solid-state reaction. The X-ray diffraction shows that the compounds crystallize into the Fe2P-type hexagonal structure with space group P$\bar{6}$2m. The magnetic measurements show that the Curie temperature of the compound increases from 253 K for x = 0.52 to 296 K for x = 0.56. The isothermal magnetic-entropy change of the Mn1.35Fe0.65P1-xSix compound decreases with the Si content increasing. The maximal value of the magnetic-entropy change is about 7.0 J/kg$\cdot$K in the Mn1.35Fe0.65P0.48Si0.52 compound with a field change of 1.5 T. The compound quenched in water possesses a larger magnetic entropy change and a smaller thermal hysteresis than the non-quenched samples. The thermal hysteresis of the compound is less than 3.5 K. The maximum adiabatic temperature change is about 1.4 K in the Mn1.35Fe0.65P0.45Si0.55 compound with a field change of 1.48 T.
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Received: 04 May 2011
Revised: 29 September 2011
Accepted manuscript online:
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PACS:
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75.50.-y
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(Studies of specific magnetic materials)
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43.40.-r
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(Structural acoustics and vibration)
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75.30.Sg
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(Magnetocaloric effect, magnetic cooling)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 50961010) and the Natural Science Foundation of Inner Mongolia, China (Grant No. 20080404Zd01). |
Corresponding Authors:
Tegus O,tegusph@imnu.edu.cn
E-mail: tegusph@imnu.edu.cn
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Cite this article:
Geng Yao-Xiang(耿遥祥), Tegus O(特古斯), and Bi Li-Ge(毕力格) Magnetocaloric effects in Mn1.35Fe0.65P1-xSix compounds 2012 Chin. Phys. B 21 037504
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