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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6156-6158 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structural and magnetic properties of the off-stoichiometric R2Fe17-type Sm2Fe14−xCoxSi2 compounds with 0≤x≤7 have been investigated by x-ray diffraction, thermomagnetic analysis, and magnetic measurements. Substitution of Co for Fe leads to an increase in Curie temperature, ΔTc=303 K for samples with x from 0 to 7. The saturation magnetization Ms increased with increasing Co content at first and then decreased. A maximum saturation magnetization Ms=124 emu/g was obtained at x about 4. The anisotropy changes from planar x〈4 to uniaxial x≥4 with Ha=23 kOe for x=7. Introduction of N leads to an increase in lattice constants causing a further enhancement in the Curie temperature and anisotropy field. The best properties were obtained for the Sm2Fe10Co4Si2N2.3 compound with Tc=742 K, Ha (300 K)=175 kOe.
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  • 2
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural and magnetic properties of the R2Fe17−xGax compounds (R=Y, Ho, 0≤x≤6) have been investigated. All investigated Ho2Fe17−xGax compounds with x(approximately-greater-than)2.5 crystallize in the Th2Zn17-type structure and the others in the Th2Ni17-type structure. The substitution of Ga for Fe leads to an increase in lattice constants a, c, and unit-cell volume, a decrease of the average Fe moment, and a maximum of the Curie temperature as a function of the Ga concentration at x=3, for both Y2Fe17−xGax and Ho2Fe17−xGax compounds. The high magnetic field leads to a spin phase transition from the ferromagnetic to the canted phase. The critical field Bc of the transition decreases with increasing Ga concentration. The exchange interaction constants JTT between Fe–Fe spins and JRT between R–T spins have been derived from a mean field analysis of Curie temperature. It has been found that JTT increases at first, going through a maximum at x=3, then decreases with increasing x, whereas JRT is almost independent of the Ga content, which is consistent with the result obtained from a mean field analysis of the high field magnetization curves of the Ho2Fe17−xGax.
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 4366-4372 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A systematic investigation of crystallographic and magnetic properties of nitride R3Fe29−xCrxN4 (R=Y, Ce, Nd, Sm, Gd, Tb, and Dy) has been performed. The lattice constants and unit cell volume decrease with increasing rare earth atomic number from Nd to Dy, reflecting the lanthanide contraction. After nitrogenation the relative volume expansion of each nitride is around between 5% and 7%. The nitrogenation results in a good improvement in the Curie temperature, the saturation magnetization and anisotropy fields at 4.2 K, and room temperature for R3Fe29−xCrxN4. Magnetohistory effects of R3Fe29−xCrxN4 and R3Fe29−xCrx (R=Nd and Sm) are observed in a low field of 0.04 T. First order magnetization process occurs in Sm3Fe24.0Cr5.0N4 in magnetic fields of 2.8 T at 4.2 K. After nitrogenation, the easy magnetization direction of Sm3Fe24.0Cr5.0 is changed from the easy-cone structure to the uniaxial. The good intrinsic magnetic properties of Sm3Fe24.0Cr5.0N4 make this compound a hopeful candidate for new high-performance hard magnets. © 1998 American Institute of Physics.
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 7450-7457 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A systematic investigation of structure and intrinsic magnetic properties of the novel compounds R3(Fe, T)29 (R=Y, Ce, Nd, Sm, Gd, Tb, and Dy; T=V and Cr) has been performed. The lattice constants and unit cell volume decrease with increasing the rare-earth atomic number from R=Nd to Dy, except for Ce, reflecting the lanthanide contraction. The Curie temperature increases from R=Ce to Gd and decreases from Gd to Dy, respectively, with increasing atomic number and Gd3Fe29−xTx has the highest Curie temperature for each series of R3Fe29−xTx (T=V or Cr) compounds. The saturation magnetization of R3Fe29−xTx at 4.2 K decreases gradually from R=Nd to Dy with increasing atomic number, except for Ce, in each series of R3Fe29−xTx. It is suggested that the Ce ion in Ce3Fe29−xTx is valence fluctuated which leads to the unusual magnetic properties. The spin reorientations of the easy magnetization direction of R3Fe29−xTx are observed at around 230, 230, and 160 K for R=Nd, Sm, and Tb when T=V, and at around 230 and 180 K for R=Nd and Tb when T=Cr, respectively. First order magnetization processes are observed around 5.7 T for Sm3Fe26.7V2.3 and 4 T for Sm3Fe24.0Cr5.0 at 4.2 K, 2.0 T for Tb3Fe28.0V1.0, and 2.3 T for Tb3Fe28.0Cr1.0 at room temperature. A phenomenological analysis shows that the saturation magnetization of R3Fe29−xTx compounds with a low T concentration can be roughly calculated based on a combination of those of the 2:17R and 1:12 units in a ratio of 1:1. © 1997 American Institute of Physics.
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7456-7460 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A coupling model of the pluralistic magnetic component R-T intermetallic compounds (R denotes rare earth, T denotes transition metal) has been proposed by means of the mean-molecular-field analysis. Using the model, the Curie temperature Tc of (Sm1−xPrx)2Fe17 compounds has been calculated and the calculated values have been compared with the experimental values. It is found that the former are consistent with the later. © 1994 American Institute of Physics.
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7452-7455 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structures and magnetic properties of R2(Fe1−xSix)17 compounds (R=Dy, Y) were investigated by x-ray phase analysis and magnetic measurements. It is shown that Si substitution for Fe leads to a phase transition at x=0.2, and that the mean iron magnetic moment μFe of R2(Fe1−xSix)17 compounds (R=Dy, Y) decreases as Si concentration x increases; moreover, there is a maximum of dependence Tc(x) at about x=0.16. It is found that the exchange interaction constant AFeFe in R2(Fe1−xSix)17 compounds (R=Dy, Y) increases with x increasing by means of mean-molecular-field analysis of Tc. © 1994 American Institute of Physics.
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6238-6240 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural and magnetic properties of the interstitial (Er1−xRx)2Fe17Ny compounds with R=Y and Gd, x=0, 0.1, 0.25, 0.4, 0.5, 0.6, 0.75, and 1.0, 2〈y〈3, have been investigated. All the parent compounds crystallize in the Th2Ni17-type structure, except for Gd2Fe17 which crystallizes in the Th2Zn17-structure. All nitrides preserve the same structure as the parents. Introduction of nitrogen results in an increase in lattice constants a and c, and the expansion of unit-cell volume is about 6%. The Curie temperature was found to increase distinctly after nitrogenation. Nitrogen absorption leads to an increase in saturation magnetization, the values of the saturation magnetization increase monotonically with increasing Y or Gd concentration. Nitrogenation increases the uniaxial anisotropy of the Er sublattice, and causes a spin reorientation. The Y and Gd concentration dependencies of the spin reorientation temperature Tsr exhibit maxima. The tentative spin phase diagrams are presented.
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6241-6243 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural and magnetic properties of the Er2Fe17−xAlxNy compounds (0≤x≤3) have been investigated. All nitrides and parent compounds crystallize in the Th2Ni17 structure. Al substituted for Fe leads to an increase in lattice constants a and c. Introduction of nitrogen results in a further increase of lattice constants, but the magnitude of this increase is smaller for increasing x. As Al content increases, the Curie temperature of the parent compound increases, whereas the Curie temperature of the nitride decreases. The substitution of Al for Fe results in a decrease of Fe moment in both nitrides and parent compounds. Introduction of nitrogen leads to an increase in the uniaxial anisotropy of the Er sublattice and a spin reorientation. A tentative spin phase diagram has been constructed.
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  • 9
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of R2Co14B1−xCx (x=0, 0.5 and R=Y, Sm) compounds have been studied by measuring the temperature dependence of the easy- and hard-magnetization curves on magnetically aligned samples between 1.5 and 300 K for Y2Co14(B,C) and at 4.2 K for Sm2Co14(B,C). The magnetic anisotropy of Y2Co14B increases due to the substitution of C for B, whereas the saturation magnetization decreases. Between 1.5 and 300 K, the anisotropy field of Y2Co14B0.5C0.5 increases about 2 T and the Co moment decreases about 0.05μB. The anisotropy field of Sm2Co14B also increases upon C substitution and the saturation magnetization decreases slightly. The ac susceptibilities of both Sm2Co14B and Sm2Co14B0.5C0.5 exhibit anomalies that may arise from a spin reorientation within the basal plane.
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  • 10
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization measurements at 4.2 K have been performed on magnetically aligned Gd2Co14B and Gd2(Co,Al)14B samples in fields up to 57 T, applied parallel to the alignment direction. At high fields, the antiparallel ferrimagnetic configuration is broken up. Values for the intersublattice molecular-field coefficient and for the molecular field acting on the Gd moment, derived by means of mean-field analysis of the observed magnetic isotherms, are presented.
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