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  • 1
    Electronic Resource
    Electronic Resource
    Temperature dependence of the electrical resistivity of amorphous (Fe1−xCox)78Si9.5B12.5 alloys : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4661-4663 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the electrical resistivity of amorphous (Fe1−xCox)78Si9.5B12.5 (0≤×≤1.0) alloys prepared by a single roller quenching apparatus was studied. The electrical resistivity of the samples was measured by using a usual four-probe method from 4.2 to 300 K. All amorphous alloys investigated here are found to exhibit a resistivity minimum at low temperature. The temperature of resistivity minimum Tmin is found first to increase and then to decrease with increasing Co content x, having a maximum value of 33.5 K at x=0.9. The electrical resistivity exhibits a logarithmic temperature dependence at T〈Tmin, and a T2 dependence in the interval Tmin〈T〈130 K. The resistivity minimum and the −ln T dependence of resistivity below Tmin can be explained by the Kondo-like effect. The temperature dependence of the electrical resistivity above Tmin was discussed by the extended Ziman theory. The Debye temperature θD calculated from the temperature coefficient of electrical resistivity above Tmin is found to be 450±70 K. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365517
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic properties of Tm2Fe17Cx (0≤x≤2.8) compounds prepared by melt spinning : The 6th joint magnetism and magnetic materials (MMM)−intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6714-6716 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The formation, structure, and magnetic properties of Tm2Fe17Cx compounds with x=0, 0.5, 1.0, 1.5, 2.0, 2.5, and 2.8 were studied. The samples with x≤1.0 were arc melted and heat treated at 1370 K for 14 h. The carbides were prepared by melt spinning at appropriate quenching rates of vs=10–20 m/s for 1.5≤x≤2.5 and by the crystallization from corresponding amorphous for x=2.8. X-ray diffraction and thermomagnetic measurements show that all samples studied are single phase with the hexagonal Th2Ni17-type structure except for Tm2Fe17C2.8, which contains a few percent of α-Fe. The lattice parameters a,c and the unit-cell volumes v increase as the carbon concentration x increases. The Curie temperature is found to rise with x from 260 K for x=0 to 669 K for x=2.8. The saturation magnetization Ms at 1.5 K is found to be 92.2–97.1 emu/g as x varies from 0 to 2.8, and the carbon concentration dependence of the Fe moment is approximately constant (2.12±0.04μB). The spin-reorientation transitions are observed. The spin-reorientation temperature is found to increase with the carbon concentration for x≤1.5, and then has a slight decrease with x for x(approximately-greater-than)1.5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358176
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic and magnetorestrictive properties of Sm1−xDyxFe2 compounds and its Mössbauer effect studies (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7429-7432 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of x-ray diffraction, magnetization, magnetostriction, and Mössbauer effect were performed on a series of Sm1−xDyxFe2 samples (x=0, 0.1, 0.15, 0.25, 0.45, and 0.65). It is shown that the system retains the cubic MgCu2 structure over the whole range and the lattice constant decreases linearly with increasing x. Results of Mössbauer effect study at room temperature show that for a small amount of Dy substitution for Sm, x〈0.15, easy axes of the magnetization keep in the [111] direction. For x(approximately-greater-than)0.15, the direction of easy axes rotates gradually from [111] for x=0, and 0.1 to [100] for x=0.45 and 0.65. The concentration dependence of the saturation magnetization exhibits a minimum at x=0.30 for 1.5 K and at x=0.45 for room temperature, reflecting the occurrence of the compensation of magnetic moments at various Sm/Dy ratios. For x=0.45 and 0.65, the pinning phenomenon of narrow domain walls was observed at low temperature. The magnetostriction was found to decrease with the increase in the Dy content, as a result of the compensation of λ111 in Sm1−xDyxFe2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356636
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  • 4
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of Tm2Fe17−xGax compounds : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5173-5175 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Crystal-structure studies on Tm2Fe17−xGax (x=0, 1, 2, 3, 4, 5, 6, 7, and 8) compounds have shown that the prepared samples are single phase with the 2:17-type structure. Both the unit-cell volume and the saturation magnetization at 1.5 K decrease linearly with increasing Ga content. The Curie temperature is found to increase with increasing x; it goes through a maximum value of 485 K at about x=3 to lower values and then it rises again. The Tm2Fe17−xGax compounds exhibit a spin–reorientaiton transition at low temperature. X-ray diffraction measurements on magnetically aligned Tm2Fe17−xGax powders show that the compounds with x≤6 have the easy-plane type of magnetic anisotropy, whereas the compounds with x[less, eq, greater]7 exhibit the easy c-axis type of magnetic anisotropy at room temperature. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364699
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic properties of Sm2Fe17−xSix and Sm2Fe17−xSixC compounds (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 2637-2640 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Iron-rich intermetallic compounds Sm2Fe17−xSix and Sm2Fe17−xSixC (x=0, 1, 2, and 3) were studied. The as-prepared compounds are single phase with the rhombohedral Th2Zn17-type structure except for Sm2Fe17C and Sm2Fe16SiC which contain some amounts of α-Fe. The unit cell volumes and saturation magnetization at room temperature are found to decrease linearly with increasing Si concentration x. The Curie temperature Tc is found first to increase and then to decrease with increasing Si content. X-ray diffraction measurements on magnetically aligned powder samples show that the easy magnetization direction of the Sm2Fe17−xSix samples with x≤2 is planar while that of the sample with x=3 is conical. The Sm2Fe17−xSixC samples with x≤3 exhibit an easy c-axis anisotropy at room temperature. The anisotropy field is 83 kOe for x=0 and it rises to 110 kOe at x=1, and then drops with increasing Si concentration to 55 kOe at x=3. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358729
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  • 6
    Electronic Resource
    Electronic Resource
    Structure and magnetic anisotropy of Sm2Fe17−xAlxC (x=2–8) compounds prepared by arc melting : The 6th joint magnetism and magnetic materials (MMM)−intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6734-6736 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In previous work it was discovered that the 2:17-type rare-earth–iron compounds with high carbon concentration could be formed by the substitution of Ga, Si, or Al, etc., for Fe in R2Fe17Cx. The effect of Al substitution for Fe on the structure and magnetic anisotropy of Sm2Fe17C has been investigated. Alloys with the composition of Sm2Fe17−xAlxC (x=2, 3, 4, 5, 6, 7, and 8) were prepared by arc melting. The carbides are single phase with rhombohedral Th2Zn17-type structure except for Sm2Fe17C which contains a small amount of α-Fe. The addition of Al results in an approximately linear increase in the lattice constants and the unit-cell volumes. The Curie temperature Tc is found to increase slightly when x≤3, then decrease rapidly with increasing Al concentration, while the room-temperature saturation magnetization decreases monotonically with the addition of aluminum. X-ray-diffraction and magnetization measurement studies of magnetic-field-oriented powders demonstrate that the samples with x≤6 exhibit an easy c-axis anisotropy at room temperature and the room-temperature anisotropy field increases from 5.3 T for x=0 to about 11 T for x=2. Further substitution decreases the anisotropy field. For the sample with x=2, the room-temperature anisotropy field is higher than that of Nd2Fe14B, and the saturation magnetization is about 110 emu/g. In this alloy, the substitution of a small amount of other elements, such as Co, Ni, etc., may yield a further improvement in its magnetic properties. Thus, it is possible that these carbides can be used as the starting materials for producing high-performance 2:17-type sintered permanent magnets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358186
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  • 7
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of arc-melted Sm2(Fe1−xCox)14Ga3C2 compounds : The 6th joint magnetism and magnetic materials (MMM)−intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6746-6748 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of the substitution of Co for Fe on the formation, structure, and magnetic properties of Sm2Fe14Ga3C2 compounds were studied. Alloys with composition Sm2(Fe1−xCox)14Ga3C2 (x=0, 0.1, 0.2, 0.3, 0.4, and 0.5) were prepared by arc melting. X-ray diffraction shows that these alloys are single phase compounds of the rhombohedral Th2Zn17-type structure. The lattice constants a and c, and the unit cell volumes v of Sm2(Fe1−xCox)14Ga3C2 compounds decrease monotonically with increasing cobalt concentration. It is found that the Curie temperature increases from 615 K for x=0 to 666 K for x=0.5. Room-temperature saturation magnetization is 90.3 emu/g for x=0, and it decreases to 79.6 emu/g at x=0.5. All compounds of Sm2(Fe1−xCox)14Ga3C2 studied in this work exhibit an easy c-axis anisotropy at room temperature. The anisotropy field is higher than 90 kOe for x≤0.2, and it decreases slightly with x≥0.3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358149
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  • 8
    Electronic Resource
    Electronic Resource
    Mössbauer study of R2Fe17Cx (R=Tb,Dy) as-quenched intermetallics compounds : The 6th joint magnetism and magnetic materials (MMM)−intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6711-6713 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Intermetallics compounds Dy2Fe17Cx (x=1.5,2.0,2.5,2.8) and Tb2Fe17Cx (x=1.5,2.0,2.5) have been successfully prepared by the melt-spinning method. The x-ray-diffraction patterns and the thermomagnetic curves show that they are single phase with the rhombohedral Th2Zn17-type structure, except for Dy2Fe17C2.8 and Tb2Fe17C2.5 which have a small percentage of α-Fe. 57Fe Mössbauer spectra were measured at 12 K and room temperature to study both the magnetic properties of R2Fe17Cx on a local scale and the effect of the interstitial C atom on the Fe atoms. It is found that the effective hyperfine fields of the various Fe sites decrease in the order 6c(approximately-greater-than)18 f(approximately-greater-than)18h(approximately-greater-than)9d. The average effective hyperfine fields Heff at 12 and 293 K do not change much with C concentration x in agreement with the moment of the Fe atoms obtained by magnetic measurements at 1.5 K. It can be concluded that the effect of C is to enhance the exchange interaction between Fe-Fe atoms, which is sensitive to the distance of Fe-Fe atoms. The C has little influence on the moments of Fe atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358175
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  • 9
    Electronic Resource
    Electronic Resource
    Structure and magnetocrystalline anisotropy of R2Fe17−xGax compounds with higher Ga concentration (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 1621-1623 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of Ga substitution for Fe in R2Fe17 (R=Y, Sm, Gd, Tb, Dy, Ho, Er, and Tm) compounds on the structure and magnetocrystalline anisotropy has been studied by means of x-ray diffraction and magnetization measurements. Both iron sublattice anisotropy and rare earth sublattice anisotropy are found to be modified by the introduction of the gallium atoms. A uniaxial anisotropy is shown in R2Fe17−xGax (for R=Y, Gd, Tb, Dy, Ho, Er, and Tm) compounds with high Ga concentration, whereas a reversal change in the easy magnetization direction is observed in the samples for R=Sm. The contributions to the uniaxial orientation of the magnetization in these compounds result from not only the rare earth sublattice, but also the iron sublattice. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114959
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  • 10
    Electronic Resource
    Electronic Resource
    The magnetic properties of Gd2Co17−xGax compounds (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 3452-3455 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: X-ray diffraction (XRD) and magnetization measurements were performed to investigate the effect of Ga substitution for Co on the structural and magnetic properties of Gd2Co17−xGax compounds (x=0, 1, 2, 3, 4, 5, 6, 7, and 8). Crystal-structure studies indicate that all samples are single phase with the rhombohedral Th2Zn17-type structure except for the samples with x=7 and 8, which contain a small amount of Co. The Ga substitution for Co in Gd2Co17 compounds leads to a monotonic increase in the unit cell volume and an approximately linear decrease in the saturation magnetization. The Curie temperature TC is found to decrease monotonically from 1210 K for x=0 to 30 K for x=8. The compensation points are observed for the Gd2Co17−xGax samples with x=5 and 6. The value of the compensation temperature, determined from the temperature dependence of the magnetization measured in a magnetic field of 1000 Oe, is 120 and 152 K for x=5 and 6, respectively. It is noteworthy that the substitution of Ga for Co in the Gd2Co17 compounds has a remarkable influence on the magnetocrystalline anisotropy. XRD studies on magnetic-field oriented Gd2Co17−xGax powders show that the sample with x=0 exhibits an easy-plane anisotropy, while the samples with x≥1 exhibit an easy c-axis anisotropy at room temperature. The change of the easy magnetization direction of Gd2Co17−xGax compounds from a basal plane to c axis indicates that the substitution of Ga for Co leads to the decrease of the planar anisotropy of the Co sublattice. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365757
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