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Magnetic properties of Fe_(3(1-x))Cr_(3x)C alloys 被引量:1
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作者 Feng-qi Zhao O. Tegus +1 位作者 B. Fuquan E. Brück 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2009年第3期314-316,共3页
The magnetic properties of Fe3(1-x)Cr3xC alloys with x=0.05, 0.1, 0.15, and 0.2, which crystallize in the cementite Fe3C-type structure with space group Pnma, were investigated by means of magnetization measurements... The magnetic properties of Fe3(1-x)Cr3xC alloys with x=0.05, 0.1, 0.15, and 0.2, which crystallize in the cementite Fe3C-type structure with space group Pnma, were investigated by means of magnetization measurements. These alloys show temperature-induced second-order magnetic phase transitions. The Curie temperature (Tc) of these alloys decreases with increasing x. The isothermal magnetic-entropy changes of these alloys were derived from the magnetic isotherms measured with increasing temperature and increasing field. The maximum values of the magnetic-entropy change are about 0.9 and 3.6 J·kg^-1·K^-1 at Tc =360 K for x = 0.05 in a magnetic field change from 0 to 1 T and 0 to 5 T, respectively. 展开更多
关键词 magnetic properties magnetocaloric effect magnetic-entropy change magnetic refrigeration
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Magnetocaloric effects in Mn1.35Feo.65P1-xSix compounds
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《Chinese Physics B》 SCIE EI CAS CSCD 2012年第3期437-441,共5页
The structural and magnetocaloric properties of Mnl.35Feo.65P1-xSix compounds are investigated. The Si- substituted compounds, Mn1.35Fe0.65Pl-xSix with x = 0.52, 0.54, 0.55, 0.56, and 0.57, are prepared by high-energy... The structural and magnetocaloric properties of Mnl.35Feo.65P1-xSix compounds are investigated. The Si- substituted compounds, Mn1.35Fe0.65Pl-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 P62m. 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 Mnl.35Fe0.65Pl-xSix compound decreases with the Si content increasing. The maximal value of the magnetic-entropy change is about 7.0 J/kg.K in the Mnl.35Feo.65Po.48Sio.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 Mnl.35Fe0.65P0.45Si0.55 compound with a field change of 1.48 T. 展开更多
关键词 magnetocaloric effect magnetic-entropy change
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Magnetocaloric effects in Mn_(1.35)Fe_(0.65)P_(1-x)Si_x compounds 被引量:1
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作者 耿遥祥 特古斯 毕力格 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第3期437-441,共页
The structural and magnetocaloric properties of Mn1.35Fe0.65P1-xSix compounds are investigated.The Sisubstituted compounds,Mn1.35Fe0.65P1-xSix with x = 0.52,0.54,0.55,0.56,and 0.57,are prepared by high-energy ball mil... The structural and magnetocaloric properties of Mn1.35Fe0.65P1-xSix compounds are investigated.The Sisubstituted 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 Fe 2 P-type hexagonal structure with space group P■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·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. 展开更多
关键词 magnetocaloric effect magnetic-entropy change
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Microstructure,magnetic and magnetocaloric properties of Fe_(2-x)Mn_xP_(0.4)Si_(0.6) alloys
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作者 耿遥祥 张志杰 +2 位作者 特古斯 董闯 王宇鑫 《Science China Materials》 SCIE EI CSCD 2016年第12期1062-1068,共7页
The present work is devoted to investigating the microstructure,magnetism and magnetocaloric effects of Si- and Mn-rich FeMn(P,Si) alloys.The Mn-substituted alloys with Fe_(2-x)Mn_xP_(0.4)Si_(0.6)(x=1.25,1.30,1.35,1.4... The present work is devoted to investigating the microstructure,magnetism and magnetocaloric effects of Si- and Mn-rich FeMn(P,Si) alloys.The Mn-substituted alloys with Fe_(2-x)Mn_xP_(0.4)Si_(0.6)(x=1.25,1.30,1.35,1.40,1.45 and 1.50) were prepared by high-energy ball milling and solid-state reaction.Experimental results show that the alloys crystallized into a majority Fe_2P-type hexagonal structure,coexisting with minor amounts of(Mn,Fe)_3Si and(Mn,Fe)_5Si_3 phases.The Curie temperature decreased linearly from 321 to 266 K with increasing Mn content from 1.25 to 1.50 in Fe_(2-x)Mn_xP_(0.4)Si_(0.6) alloys.The first-order magnetic phase transition became weakened and the second-order magnetic phase transition became dominated with increasing Mn content.Fe_(0.75)Mn_(1.25)P_(0.4)Si_(0.6) alloy presents a maximum isothermal magnetic-entropy changes of 7.2 J(kg K)^(-1) in a magnetic field change of 0-1.5 T.The direct measurement shows that Fe_(0.7)Mn_(1.3)P_(0.4)Si_(0.6) and Fe_(0.65)Mn_(1.35)P_(0.4)Si_(0.6) alloys exhibit a maximum adiabatic temperature change of 1.8 K in a magnetic field change of 0-1.48 T.The thermal hysteresis for all alloys is less than 4 K.These experimental results reveal that Fe_(2-x)Mn_xP_(0.4)Si_(0.6) alloys could be a candidate material for magnetic refrigeration. 展开更多
关键词 Fe2-xMnxP0.4Si0.6 alloys MICROSTRUCTURE thermal hysteresis magnetic-entropy change adiabatic temperature change
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