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Chin. Phys. B, 2012, Vol. 21(3): 037504    DOI: 10.1088/1674-1056/21/3/037504
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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
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.
Keywords:  magnetocaloric effect      magnetic-entropy change  
Received:  04 May 2011      Revised:  29 September 2011      Accepted manuscript online: 
PACS:  75.50.-y (Studies of specific magnetic materials)  
  43.40.-r (Structural acoustics and vibration)  
  75.30.Sg (Magnetocaloric effect, magnetic cooling)  
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

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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