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  • 1
    Electronic Resource
    Electronic Resource
    Temperature-dependent magnetization of canted moments in erbium- iron-manganese-boron (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 2783-2785 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization as a function of field up to 9 T is reported for Er2Fe14−xMnxB compounds with x=2 and 2.5 at temperatures T between 4 and 120 K. The noncollinear basal plane moment structure which exists among the Er and transition-metal moments within this temperature regime gives rise to an unusual nonsaturating field-dependent magnetization behavior. The magnetization increases linearly with field up to a field H*, where the slope dM/dH abruptly changes. M(H) is again linear above H*, but with a much steeper slope dM/dH∼0.5 μB/formula unit/T. H* increases monotonically with temperature for x=2, until no slope change is observed at experimentally accessible fields when T=120 K. In the x=2.5 sample, H* initially decreases with increasing temperature, and reaches a minimum at 55 K. This behavior appears in a plot of M(T) as a compensation temperature Tcomp, that is, as a minimum in the magnetization near 55 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341577
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  • 2
    Electronic Resource
    Electronic Resource
    Rare Earth-Iron-Boron Materials: A New Era in Permanent Magnets (1986)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Materials Research 16 (1986), S. 467-485 
    Details
    ISSN: 0084-6600
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ms.16.080186.002343
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of the zirconium site in zirconium-substituted Nd2Fe14B : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6476-6478 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a direct determination of the Zr site in pseudoternary alloys with a nominal composition of Nd1.6Zr0.4Fe14B using extended x-ray absorption fine structure (EXAFS). Comparing the Zr EXAFS from these alloys to the Y EXAFS from Y2Fe14B and the Fe EXAFS from Nd2Fe14B reveals that the local Zr and Y environments are nearly identical, and quite disparate from the Fe environment. This finding, and results from x-ray diffraction and electron microscopy, lead to the conclusion that Zr is incorporated as a substituent for Nd in the Nd2Fe14B structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352585
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  • 4
    Electronic Resource
    Electronic Resource
    Structural and magnetic properties of R3(Fe,T)29 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. 6144-6146 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the formation of several members of the recently discovered class of R3(Fe,T)29 compounds and some of their intrinsic properties. Focusing on materials with T=Ti and Cr, we have prepared R3(Fe,Ti)29 (R=Ce, Pr, Nd, Sm) and R3(Fe,Cr)29 (R=Ce, Nd, Sm) compounds which all feature the novel monoclinic crystal structure first established for Nd3(Fe,Ti)29. In each of the Ti- and Cr-containing groups the Ce member has the smallest magnetization, Curie temperature, and unit cell, suggesting that the Ce ion is tetravalent, or nearly so, in this family of materials. We observed no evidence of R3(Fe,Ti)29 phase formation for R=Y, Gd, Dy, and Er. Our magnetization measurements indicate that only Nd3(Fe,Ti)29 and Nd3(Fe,Cr)29 exhibit spin reorientations, at temperatures of 235 and 145 K, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358334
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  • 5
    Electronic Resource
    Electronic Resource
    Thermodynamic and magnetic properties of metastable FexCu100−x solid solutions formed by mechanical alloying (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 955-962 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Metastable solid solutions of Fe and Cu, which are immiscible in equilibrium, have been formed using high-energy ball milling of elemental powder mixtures. Single-phase face-centered-cubic (fcc) solid solution was obtained for 0〈x≤60, and body-entered-cubic (bcc) solid solution for 75≤x〈100. The transition from fcc to bcc occurred near x=70, where a mixture of fcc and bcc phases was obtained. The enthalpy of transformation to equilibrium was measured using differential scanning calorimetry. The average atomic volume of the phases exhibits a positive deviation from Vegard's law, in qualitative agreement with the large positive enthalpy of mixing in this system. The magnetic moments and Curie temperatures for the metastable solid solutions have been determined and compared with those reported for Fe-Cu alloys formed by vapor deposition. Calculations of the formation enthalpy (ΔH) and free energy (ΔG) have been performed based on calphad data, with corrections based on our magnetization measurements. The calculated ΔG results are used to explain the observed fcc-bcc transition under polymorphous constraints.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354837
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  • 6
    Electronic Resource
    Electronic Resource
    Superconducting yttrium-barium-copper-oxide ribbons fabricated from a metal alloy precursor (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 438-440 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a new process for making superconducting Y-Ba-Cu-oxide ribbon from a ductile metal alloy precursor ribbon. We begin by melt-spinnng an alloy having the composition YCu3 to obtain the microcrystalline precursor ribbon. The ribbon is coated with a molten mixture of Ba inorganic compounds at 550 °C, and reacted in air at 925 °C to form the superconducting YBa2Cu3O7−x phase. The superconducting onset occurs at 92 K and zero resistance is reached at 89 K. X-ray diffraction, electron microscopy, and magnetization measurements confirm that the ribbon is predominantly superconducting YBa2Cu3O7−x.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100613
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  • 7
    Electronic Resource
    Electronic Resource
    Field-induced spin reorientation in erbium-iron-manganese-boron (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 2188-2190 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Er2Fe14B undergoes a spin reorientation from a low-temperature planar moment orientation to a high-temperature axial orientation at Ts=336 K. We report for the first time that the planar to axial reorientation can be induced at temperatures below Ts by applying a sufficiently large magnetic field. Room-temperature reorientation in Er2Fe14B is induced at a field of about 120 kOe. Investigation of Er2Fe14−xMnxB compounds shows that the field required to induce reorientation decreases as T approaches Ts from below. The magnetic moment is larger in the axial orientation than in the planar orientation; hence, reorientation occurs at the field where the magnetostatic energy gained by the larger axial moment overcomes the unfavorable anisotropy energy at temperatures near Ts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99765
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  • 8
    Electronic Resource
    Electronic Resource
    Phase formation in melt-spun Nd-Fe-Mo-Ti alloys : 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. 6056-6058 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report for the first time the range of ThMn12-type crystal structure formation in melt-spun Nd-Fe-Mo-Ti ribbons. These materials, which combine the melt-spun microstructure with the favorable intrinsic magnetic properties of the NdFe12−x(Mo,Ti)x phase, are important as precursors to the formation of hard magnetic materials by nitrogen absorption. Alloys with compositions Nd1.15Fe10+xMo2−2xTix (0≤x≤1), which grade the composition smoothly between the two end point alloys Nd1.15Fe10Mo2 and Nd1.15Fe11Ti, were melt spun at quench wheel velocities 5 m/s≤vs≤30 m/s. From x-ray diffraction patterns we construct a phase formation diagram as a function of Ti content x and wheel speed vs. We find that the desired ThMn12 structure is obtained only in ribbons quenched at low vs. At higher speeds, the ribbons quench instead into the disordered TbCu7-type crystal structure. Further, the ThMn12 structure is considerably less stable at the Ti-rich end of the composition range than at the Mo-rich end: for Nd1.15Fe10Mo2, the ThMn12 structure is obtained for vs≤17.5 m/s, whereas in Nd1.15Fe11Ti only ribbons quenched at vs=5 m/s are of the ThMn12 type. Heat treatments of Nd1.15Fe11Ti ribbons melt spun at 30 m/s confirm the relatively difficult formation of the ThMn12 structure type; annealing temperatures in excess of 1000 °C are required to form the ThMn12 crystal structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358364
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  • 9
    Electronic Resource
    Electronic Resource
    Nitriding of melt-spun Nd-Fe-Mo alloys : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6015-6017 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The hard magnetic properties of nitrided melt-spun Nd-Fe-Mo ribbons have been investigated as functions of composition, quench rate, and nitriding time. Ingots having the compositions Nd1Fe10Mo2, Nd1.15Fe10Mo2, Nd1.3Fe10Mo2, and Nd1.45Fe10Mo2 were melt spun over a range of quench rates specified by substrate wheel velocities vs in the 5 m/s≤vs≤40 m/s interval. Ribbons prepared with vs≤17.5 m/s from the Nd1.15Fe10Mo2 alloy consist only of stoichiometric NdFe10Mo2 with the ThMn12 crystal structure; at higher quench rates the ThMn12 structure is suppressed. It is found that all ribbons prior to nitriding are characterized by intrinsic coercivity Hci〈0.4 kOe. For ribbons direct quenched at wheel speeds between 12.5 and 17.5 m/s, nitriding produces technologically significant coercivity (Hci∼6 kOe). The maxima in the technical magnetic properties as functions of vs resemble those observed in direct-quenched Nd-Fe-B ribbons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355493
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  • 10
    Electronic Resource
    Electronic Resource
    X-ray-absorption fine structure of selected R2Fe17 nitrides : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7018-7020 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: X-ray-absorption fine structure from the rare-earth L3 edges in R2Fe17N3−x (R=Sm, Pr, or Nd), x∼0.2, establishes that these nitrides have 2.6±0.6 nitrogen atoms bonded 2.54–2.57 A(ring) from the rare-earth site. The observed enhancement of the nitrogen backscattering from magnetically oriented powders of Sm2Fe17N3−x establishes that between 80% and 100% of the nitrogen atoms occupy 9(e) sites of the Sm2Fe17N3−x. No evidence is found for partial nitrogen occupancy of the 18(g) sites in Sm2Fe17N3−x.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356762
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