The structure, magnetization, and magnetostriction of Sm0.9Pr0.1Fex and Sm1-xNdxFel.9 thin films have been investigated using X-ray diffraction, vibrating sample magnetometer, and optical cantilever method. It is foun...The structure, magnetization, and magnetostriction of Sm0.9Pr0.1Fex and Sm1-xNdxFel.9 thin films have been investigated using X-ray diffraction, vibrating sample magnetometer, and optical cantilever method. It is found that the structure of Sm0.9Pr0.1Fex thin films consists of an Sm-Pr-Fe amorphous phase when x≤2.69 and that of Sm1-xNdxFel.9 thin films consists of an Sm-Nd-Fe amorphous phase. The in-plane magnetization of Sm0.91Pr0.1Fex thin films increases with increase in the Fe content, and low values of the in-plane coercivity occur in the range of 1.62≤ x≤ 2.28. The magnetostriction value of Sm0.91Pr0.1Fex thin films increases with increasing the Fe content when x ≤ 1.94 and decreases when x 〉 1.94. The in-plane magnetostriction of Sm1-xNdxFe1.9 thin films under low magnetic fields has been improved by the substitution of Nd for Sm when x = 0.2.展开更多
The phase relationships of R-Fe pseudobinary system(R=Dy0.65Tb0.25Pr0.1) have been determined using optical microscopy,X-ray diffraction,EPMA and DTA techniques.This system contains one eutectic reaction and four peri...The phase relationships of R-Fe pseudobinary system(R=Dy0.65Tb0.25Pr0.1) have been determined using optical microscopy,X-ray diffraction,EPMA and DTA techniques.This system contains one eutectic reaction and four peritectic reactions.The four intermetallic compounds are(Dy,Tb,Pr)Fe2,(Dy,Tb,Pr)Fe3,(Dy,Tb,Pr)6Fe23 and(Dy,Tb,Pr) 2Fe17 The homogeneity regions of these compounds shift towards rare earth-rich side of the stoichiometric composition except(Dy, Tb,Pr) 2Fe17.展开更多
The structure and magnetostriction of R(Fe_(1-x)Al_x)_y alloys(R=Dy_(0.65)Tb_(0.25)Pr_(0.1),x≤0.3,y=1.8 and 2) have been investigated using metallography, X-ray diffraction, electron probe micro- analysis(EPMA) and ...The structure and magnetostriction of R(Fe_(1-x)Al_x)_y alloys(R=Dy_(0.65)Tb_(0.25)Pr_(0.1),x≤0.3,y=1.8 and 2) have been investigated using metallography, X-ray diffraction, electron probe micro- analysis(EPMA) and standard strain gauge techniques.It was found that the matrix of R(Fe_(1-x)Al_x)_2 alloys is cubic Laves phase(Dy,Tb,Pr)(Fe,Al)_2 and the second phase is PuNi3-type (Dy,Tb,Pr)(Fe,Al)_3 when x<0.15.The R(Fe_(1-x)Al_x)_(1.8) alloys contain trace of rare earth-rich phase.The magnetostriction of R(Fe_(1-x)Al_x)_y alloys decreases with increasing x in high magnetic fields; however, it exhibits a peak when x = 0.05 in low magnetic fields(H≤ 160 kA / m).The magnetostriction of R(Fe_(1-x)Al_x)_(1.8) alloys is higher than that of R(Fe_(1-x)Al_x)_2 alloys when x<0.15.展开更多
The effects of the partial substitution of element M(M=Cr,V,Mn,x=0.05;Zr,Ga,x=0.017; Si,x=0.15;Co,x=0.10)for Fe in samarium-iron-nitride Sm_2(Fe_(1-x)M_x)_(17)N_y compounds on their stabilities and Curie temperatures ...The effects of the partial substitution of element M(M=Cr,V,Mn,x=0.05;Zr,Ga,x=0.017; Si,x=0.15;Co,x=0.10)for Fe in samarium-iron-nitride Sm_2(Fe_(1-x)M_x)_(17)N_y compounds on their stabilities and Curie temperatures have been studied.It is found that Co,Ga can raise the Curie temperature of the compounds.The initial decomposition temperatures cannot be raised significantly by all the studied elements except Co.The result contradicts the formation enthalpy consideration.The final decomposition tempera- tures can be raised by all of the substitution elements.The effects of atmospheres on their decomposition be- havior were also studied.The results show that oxidation is the major reason for magnetic deterioration of the powder heated in air.Compared with nitrogen atmosphere,argon or vacuum helps to delay the decompo- sition of the compounds.展开更多
Phase equilibria of the R-Fe-Co pseudoternary system with R≤33.3%(mole fraction, R=Sm 0.5Dy 0.5) were determined in an isothermal section at 1 073 K and a vertical section of RFe 2-RCo 2 by using OM, X-ray diffractom...Phase equilibria of the R-Fe-Co pseudoternary system with R≤33.3%(mole fraction, R=Sm 0.5Dy 0.5) were determined in an isothermal section at 1 073 K and a vertical section of RFe 2-RCo 2 by using OM, X-ray diffractometer, EPMA DTA techniques. There are seven intermetallic phases: (Sm, Dy)(Fe, Co) 2, (Sm, Dy)(Fe, Co) 3, (Sm, Dy) 6(Fe, Co) 23, (Sm, Dy) 2(Fe, Co) 7, (Sm, Dy)(Fe, Co) 5, Th 2Ni 17-type and Th 2Zn 17-type (Sm, Dy) 2(Fe, Co) 17. The (Sm, Dy) 6(Fe, Co) 23 phase dissolves 36% Co(mole fraction) at 1 073 K. However, the (Sm, Dy) 2(Fe, Co) 7 phase in R 2(Fe 1-xCo x) 7 alloys dissolves about 19% Fe(mole fraction) at 1 073 K.展开更多
基金This study has been supported by the National Natural Science Foundation of China (Nos. 50371025, 50571034) and the Natural Science Foundation of Hebei Province, China (No. 503055)
文摘The structure, magnetization, and magnetostriction of Sm0.9Pr0.1Fex and Sm1-xNdxFel.9 thin films have been investigated using X-ray diffraction, vibrating sample magnetometer, and optical cantilever method. It is found that the structure of Sm0.9Pr0.1Fex thin films consists of an Sm-Pr-Fe amorphous phase when x≤2.69 and that of Sm1-xNdxFel.9 thin films consists of an Sm-Nd-Fe amorphous phase. The in-plane magnetization of Sm0.91Pr0.1Fex thin films increases with increase in the Fe content, and low values of the in-plane coercivity occur in the range of 1.62≤ x≤ 2.28. The magnetostriction value of Sm0.91Pr0.1Fex thin films increases with increasing the Fe content when x ≤ 1.94 and decreases when x 〉 1.94. The in-plane magnetostriction of Sm1-xNdxFe1.9 thin films under low magnetic fields has been improved by the substitution of Nd for Sm when x = 0.2.
文摘The phase relationships of R-Fe pseudobinary system(R=Dy0.65Tb0.25Pr0.1) have been determined using optical microscopy,X-ray diffraction,EPMA and DTA techniques.This system contains one eutectic reaction and four peritectic reactions.The four intermetallic compounds are(Dy,Tb,Pr)Fe2,(Dy,Tb,Pr)Fe3,(Dy,Tb,Pr)6Fe23 and(Dy,Tb,Pr) 2Fe17 The homogeneity regions of these compounds shift towards rare earth-rich side of the stoichiometric composition except(Dy, Tb,Pr) 2Fe17.
文摘The structure and magnetostriction of R(Fe_(1-x)Al_x)_y alloys(R=Dy_(0.65)Tb_(0.25)Pr_(0.1),x≤0.3,y=1.8 and 2) have been investigated using metallography, X-ray diffraction, electron probe micro- analysis(EPMA) and standard strain gauge techniques.It was found that the matrix of R(Fe_(1-x)Al_x)_2 alloys is cubic Laves phase(Dy,Tb,Pr)(Fe,Al)_2 and the second phase is PuNi3-type (Dy,Tb,Pr)(Fe,Al)_3 when x<0.15.The R(Fe_(1-x)Al_x)_(1.8) alloys contain trace of rare earth-rich phase.The magnetostriction of R(Fe_(1-x)Al_x)_y alloys decreases with increasing x in high magnetic fields; however, it exhibits a peak when x = 0.05 in low magnetic fields(H≤ 160 kA / m).The magnetostriction of R(Fe_(1-x)Al_x)_(1.8) alloys is higher than that of R(Fe_(1-x)Al_x)_2 alloys when x<0.15.
文摘The effects of the partial substitution of element M(M=Cr,V,Mn,x=0.05;Zr,Ga,x=0.017; Si,x=0.15;Co,x=0.10)for Fe in samarium-iron-nitride Sm_2(Fe_(1-x)M_x)_(17)N_y compounds on their stabilities and Curie temperatures have been studied.It is found that Co,Ga can raise the Curie temperature of the compounds.The initial decomposition temperatures cannot be raised significantly by all the studied elements except Co.The result contradicts the formation enthalpy consideration.The final decomposition tempera- tures can be raised by all of the substitution elements.The effects of atmospheres on their decomposition be- havior were also studied.The results show that oxidation is the major reason for magnetic deterioration of the powder heated in air.Compared with nitrogen atmosphere,argon or vacuum helps to delay the decompo- sition of the compounds.
文摘Phase equilibria of the R-Fe-Co pseudoternary system with R≤33.3%(mole fraction, R=Sm 0.5Dy 0.5) were determined in an isothermal section at 1 073 K and a vertical section of RFe 2-RCo 2 by using OM, X-ray diffractometer, EPMA DTA techniques. There are seven intermetallic phases: (Sm, Dy)(Fe, Co) 2, (Sm, Dy)(Fe, Co) 3, (Sm, Dy) 6(Fe, Co) 23, (Sm, Dy) 2(Fe, Co) 7, (Sm, Dy)(Fe, Co) 5, Th 2Ni 17-type and Th 2Zn 17-type (Sm, Dy) 2(Fe, Co) 17. The (Sm, Dy) 6(Fe, Co) 23 phase dissolves 36% Co(mole fraction) at 1 073 K. However, the (Sm, Dy) 2(Fe, Co) 7 phase in R 2(Fe 1-xCo x) 7 alloys dissolves about 19% Fe(mole fraction) at 1 073 K.
