The phases and magnetocaloric effect in the alloys Tb（Co1-xSnx）2 with x = 0, 0.025, 0.050, 0.075, 0. 100 were investigated by X-ray diffraction analysis and magnetization measurement. The substitution of Sn in TbCo2...The phases and magnetocaloric effect in the alloys Tb（Co1-xSnx）2 with x = 0, 0.025, 0.050, 0.075, 0. 100 were investigated by X-ray diffraction analysis and magnetization measurement. The substitution of Sn in TbCo2 was limited. The cubic MgCu2-type structure for the sample of TbCo2 was confirmed by the results of X-ray powder diffraction and the rest samples consist of the TbCo2 phase mainly, together with some TbCo3 and Tb5Sn3 impurity phases. The impurity phases increase with the increase of Sn contents. The magnetic phase transition in all samples keeps second-order transition. Tc increases slightly by Sn substitution from 230 K of the alloy with x = 0 to 233 K of the alloy with x = 0.050 and then a slight decrease for higher concentration of x. The maximum magnetic entropy change in the samples Tb （Co1- x Snx）2 with x =0, 0.025, 0.050, 0.075 are 3.44, 2.29, 1.64, 1.16 J·kg^-1·K^-1, respectively, with the applied field change from 0 to 2.0 T.展开更多
The effects of the introduction of Ce to La（1-x）CexFe（11.5）Si（1.5） alloys on 1：13 phase formation mechanism,the first-order magnetic phase transition strengthening characteristics,and magnetocaloric property we...The effects of the introduction of Ce to La（1-x）CexFe（11.5）Si（1.5） alloys on 1：13 phase formation mechanism,the first-order magnetic phase transition strengthening characteristics,and magnetocaloric property were studied,respectively.The results show that the formation mechanisms of 1：13 and La Fe Si phases in La（1-x）CexFe（11.5）Si（1.5） alloys are the same as those of Ce2Fe（17） and CeFe2 phases in Ce–Fe binary system,respectively.The substitution of Ce in 1：13 phase which is limited can make the first-order magnetic phase transition characteristics strengthen,which can make thermal and magnetic hysteresis increase,the temperature interval of temperatureinduced phase transition decrease,and the critical magnetic field of field-induced magnetic phase transition（HC）increase,respectively.Owing to the lattice shrink of 1：13phase with the increase in Ce content,the Curie temperatures（TC） show a linear decrease.The maximum change in magnetic entropy gradually increases due to the decrease in temperature interval of temperature-induced phase transition,but the relative cooling capacities are all about80 Jákg-1at magnetic field of 2 T.展开更多
文摘The phases and magnetocaloric effect in the alloys Tb（Co1-xSnx）2 with x = 0, 0.025, 0.050, 0.075, 0. 100 were investigated by X-ray diffraction analysis and magnetization measurement. The substitution of Sn in TbCo2 was limited. The cubic MgCu2-type structure for the sample of TbCo2 was confirmed by the results of X-ray powder diffraction and the rest samples consist of the TbCo2 phase mainly, together with some TbCo3 and Tb5Sn3 impurity phases. The impurity phases increase with the increase of Sn contents. The magnetic phase transition in all samples keeps second-order transition. Tc increases slightly by Sn substitution from 230 K of the alloy with x = 0 to 233 K of the alloy with x = 0.050 and then a slight decrease for higher concentration of x. The maximum magnetic entropy change in the samples Tb （Co1- x Snx）2 with x =0, 0.025, 0.050, 0.075 are 3.44, 2.29, 1.64, 1.16 J·kg^-1·K^-1, respectively, with the applied field change from 0 to 2.0 T.
基金financially supported by the National Natural Science Foundation of China(No.51176050)the Research Projects in Sichuan Province Education Office(No.12ZB073)
文摘The effects of the introduction of Ce to La（1-x）CexFe（11.5）Si（1.5） alloys on 1：13 phase formation mechanism,the first-order magnetic phase transition strengthening characteristics,and magnetocaloric property were studied,respectively.The results show that the formation mechanisms of 1：13 and La Fe Si phases in La（1-x）CexFe（11.5）Si（1.5） alloys are the same as those of Ce2Fe（17） and CeFe2 phases in Ce–Fe binary system,respectively.The substitution of Ce in 1：13 phase which is limited can make the first-order magnetic phase transition characteristics strengthen,which can make thermal and magnetic hysteresis increase,the temperature interval of temperatureinduced phase transition decrease,and the critical magnetic field of field-induced magnetic phase transition（HC）increase,respectively.Owing to the lattice shrink of 1：13phase with the increase in Ce content,the Curie temperatures（TC） show a linear decrease.The maximum change in magnetic entropy gradually increases due to the decrease in temperature interval of temperature-induced phase transition,but the relative cooling capacities are all about80 Jákg-1at magnetic field of 2 T.
基金National Natural Science Foundationof China(10504019,10674092)Shanghai Nano-technology Promotion Center and the Science & Technology Committee of Shanghai Municipality(0652nm046).
