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  • Electronic Resource  (23)
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  • Electronic Resource  (23)
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  • 1
    Electronic Resource
    Electronic Resource
    Hydrogen absorption and disproportionation of melt-spun Nd–Fe–B ribbons (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3514-3518 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hydrogen absorption and disproportionation of melt-spun Nd–Fe–B-based ribbons are significantly affected by quench state (wheel speed). The initial hydrogen absorption temperature corresponding to the formation of the Nd2Fe14BHx-type phase shifts from ∼120 °C for ingot to 250–300 °C for ribbons spun at 13, 15, 17, 20, 22, and 24 m/s wheel speeds. This shift is presumably related to the fact that ribbons are considerably more inert than ingot, which is typical of Nd–Fe–B materials. The hydrogen disproportionation temperature, however, monotonically decreases with increasing wheel speed from (approximately-greater-than)700 °C for ingot to 530 °C for 24 m/s ribbons. Hydrogen absorption due to disproportionation exhibits a two-step feature for wheel speeds ≥20 m/s. The onset and size of the lower temperature step correlates with the presence and amount of an amorphouslike component in the x-ray diffraction spectra of as-spun ribbons. The amorphouslike component is detectable only for wheel speeds ≥20 m/s, and both the amount of amorphouslike component and the size of the lower temperature step in the hydrogen absorption increase with increasing wheel speed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355317
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetization study of YBa2Cu3Oy high-temperature superconductors: The effect of copper depletion and silver addition : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5370-5372 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Meissner effect measurements were used to characterize the effect of copper depletion and silver substitution on the bulk superconducting properties of YBa2Cu3Oy. A strong copper composition dependence of superconductivity was observed: A 20% depletion of copper from the samples resulted in an 88% decrease in the strength of superconductivity in YBa2Cu3Oy as measured by the Meissner effect. Because flux trapping and field penetration were likely to be significant in the high-Tc materials, it was difficult to determine the volume fraction of superconducting material in the samples. Variations in the lattice constants were consistent with copper composition-induced disorder on the orthorhombic lattice which became more pseudocubic, i.e., a(approximately-equal-to)b=c/3, with copper depletion. The addition of silver had essentially no effect on superconductivity or the lattice constants of YBa2Cu3Oy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348035
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Crystallographic alignment analysis of Nd2Fe14B materials using standard x-ray powder diffraction spectra (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2659-2664 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The crystallographic alignment quality of anisotropic magnetic materials made from die-upset Nd2Fe14B (MQ-III) materials was determined using a phenomenological analysis of θ-2θ x-ray diffraction spectra. This analysis consisted of fitting a calculated diffraction spectrum for aligned Nd2Fe14B to an observed spectrum collected on a bulk MQ-III slab oriented with the c-axis alignment parallel to the direction normal to the surface of the slab. The calculated spectrum was then used as a standard for intensity shifts of diffraction peaks corresponding to crystallographic reorientation from random to c-axis alignment. Intensity shifts for other samples for Nd2Fe14B materials having various degrees of c-axis alignment were determined and compared to the standard shifts giving an alignment factor representing the nature and extent of the crystallographic alignment in the sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351567
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  • 4
    Electronic Resource
    Electronic Resource
    Hydrogen decrepitated anisotropic Nd-Fe-B powder: Hydrogen desorption and magnetic properties : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6482-6484 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The hydrogen decrepitation (HD) process easily pulverizes rapidly solidified, hot-deformed Nd-Fe-B (MQ3) magnets but degrades the magnetic properties. Recovery of high-performance magnetism in HD MQ3 powder has always required hydrogen desorption at temperatures above 600 °C. It is reported that desorption at the relatively low temperature of 240 °C restores magnetic coercivity Hci to above 10 kOe despite residual hydrogen in the material. Desorption between 240 and 580 °C significantly degrades Hci but not the intrinsic magnetic anisotropy. Hydrogen is reabsorbed when the desorbed powder is cooled from above 600 °C to room temperature in the presence of small amounts of residual hydrogen gas. This hydrogen reabsorption strongly degrades the coercivity but does not affect the intrinsic magnetic anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352587
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  • 5
    Electronic Resource
    Electronic Resource
    Study of desorbed hydrogen-decrepitated anisotropic Nd-Fe-B powder using x-ray diffraction : 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. 6259-6261 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The intrinsic magnetic coercivity (Hci) of Nd-Fe-B-based permanent magnet material is profoundly affected by hydrogen absorbed during the hydrogen decrepitation (HD) process for producing anisotropic powders from bulk anisotropic hot-deformed MAGNEQUENCH (MQ) magnets. Hydrogen (H) content and x-ray diffraction measurements clarify the effects of H and desorption temperature (Td) on the intrinsic magnetic anisotropy (IMA) of the Nd2Fe14B-type phase and the nature of the intergranular phases, both of which are crucial for high Hci. The Nd-rich intergranular phase disproportionates during HD, initially forming a microcrystalline Nd-hydride phase, possibly Nd2H5. For Td≤220 °C, H remains in the Nd2Fe14B-type phase, severely degrading the IMA, which causes a low Hci. For 220 °C≤Td≤250 °C, enough H desorbs from the Nd2Fe14B-type phase and the IMA recovers its large prehydrided value, and the microstructure supports a high Hci≤10 kOe in spite of the H disproportionated intergranular phase. Only for Td(approximately-greater-than)250 °C is Hci degraded by the microstructure, corresponding to further H desorption and the microcrystalline Nd-hydride phase becoming well-crystallized NdH2. The NdH2 phase decomposes with continued H desorption and at Td(approximately-greater-than)580 °C recombines to re-form the Nd-rich intergranular phase of prehydrided MQ material. H is completely desorbed above 580 °C and Hci(approximately-greater-than)11 kOe, nearly that of the prehydrided MQ magnets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358298
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  • 6
    Electronic Resource
    Electronic Resource
    Raman scattering study of antimony-based skutterudites (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2622-2626 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Raman spectra of single-crystal CoSb3 and RhSb3 and of polycrystalline IrSb3 have been studied. We have also studied four different polycrystalline-filled skutterudite samples, Ir4LaGe3Sb9, Ir4NdGe3Sb9, Ir4SmGe3Sb9, and Fe4CeSb12, where rare-earth ions occupy the voids in the skutterudite structure. These void-filling ions interact with some of the lattice vibrations in this structure and produce a shift and broadening of the observed lines. The most prominent lines in all of the samples are the Sb4 ring-breathing modes. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361132
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  • 7
    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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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic and structural studies of erbium-iron-manganese-boron alloy (invited) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3119-3123 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the results of neutron diffraction and magnetization measurements on powder samples of Er2(Fe,Mn)14B. We find that the unit cell expands with increased concentration of manganese as larger manganese atoms replace the smaller iron atoms within the transition metal sublattice. The preferential occupancy of transition metal sites is also affected since manganese prefers positions with larger site volumes, such as the j2, while iron prefers smaller site volumes, such as the k2. At low temperatures (4.2 K) the simple collinear moment model of the magnetic structure, valid at higher temperatures, is not sufficient to explain the existence of reflections forbidden in the space group P42/mnm. A five-sublattice model is used in which each of the two rare-earth sites splits into two distinct sublattices whose moments are oppositely canted from the direction antiparallel to the transition metal moment. The linear field dependence of the magnetization provides support for this moment configuration. Neutron diffraction analysis of the transition metal moments is compared to the compositional dependence of the magnetization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340863
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  • 10
    Electronic Resource
    Electronic Resource
    Coherent-state Hall effect in the heavy fermions CeCu6 and U2PtC2 (abstract) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4397-4397 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Hall effect is found to set the scale for coherence in the normal state of CeCu6 and U2PtC2. CeCu6 is a nonmagnetic, nonsuperconducting heavy fermion system.1–4 Its resistivity at high temperature is like that of a collection of incoherent Kondo scatterers. At low temperature the resistivity smoothly decreases to a very small value, indicating that scattering has become coherent. The Hall effect has two strong extrema in its temperature dependence which define a high-temperature incoherent scattering region, a transition region, and a low temperature coherent region. Although U2PtC2 is superconducting below 1.5 K,5 the Hall results in the normal state show two extrema similar to those of CeCu6. However, these features are scaled to higher temperatures, consistent with the smaller low-temperature electronic specific heat and higher Fermi temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338435
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