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  • 1995-1999  (5)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Molecular Dynamics and Quantum Chemistry Study of a Proton-Coupled Electron Transfer Reaction (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 945-954 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100003a017
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of mechanical alloyed Nd–Fe–Ti compounds and their nitrides : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5525-5527 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Nd–Fe–Ti intermetallic compounds with a ThMn12 structure have been successfully prepared by mechanical alloying and then annealed. It has been found that the phase of the hexagonal TbCu7 structure is formed in Nd8Fe84Ti8 mechanical alloy powders annealed at temperatures ranging from 650 to 850 °C. With an increase in the annealing temperature Ta, the metastable TbCu7 structure transforms into a ThMn12 structure at Ta=900 °C. Consequently, the Curie temperature increases from 180 °C of TbCu7 structure at Ta=650 to 300 °C of ThMn12 structure at Ta=1050 °C. In the series of NdxFe92−xTi8 annealed at 960 °C for 30 min, it has been observed that the ThMn12 structure exists only over the range of compositions of 5≤x〈11, and the structure of the type Th2Zn17 is formed for x≥11. All the compounds are nitrited at 400 °C for 15 h, and the Curie temperatures are raised from 400 to 450 °C. The Nd9Fe83Ti8 powder, annealed at 960 °C for 30 min, and nitrided at 400 °C for 15 h, has a coercivity iHc=2.3 kOe. The low coercivity perhaps mainly results from an excessive growth of α-Fe grains due to the high annealing temperature necessary for forming the hard magnetic phase Nd(Fe,Ti)12Nδ. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362298
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Crystallographic transformations of rapidly quenched Sm10Fe90−xTix and magnetic properties of their nitrides (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 6170-6176 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sm10Fe90−xTix alloys (x=0, 1, 3, 4, 5, 6, 8, 10) were prepared by rapid quenching and sequent annealing. Structural transformations from amorphous, metastable-to-equilibrium phases, and magnetic properties of their nitrides were systematically investigated. A CaCu5-type metastable phase was formed for 0≤x≤10 as the crystallization of the amorphous alloys occurred below 700 °C. The CaCu5-type structure is transformed into a TbCu7-type one with increased annealing temperature (above 700 °C). These alloys have different structures including Th2Zn17 type for 0≤x≤3, TbCu7 type for 3〈x〈6, and ThMn12 type for 6≤x≤10, at high annealing temperatures (above 950 °C). Nitrogenation was carried out at 460 °C for 6 h. The best hard magnetic properties are obtained after nitriding for x=3. It gives iHc=17.6 kOe, 4πMr=7.7 kG, and (BH)max=6.8 MGOe for the TbCu7-type phase and iHc=8.6 kOe, 4πMr=8.4 kG, and (BH)max=10.2 MGOe for the CaCu5-type one. Although the coercivity of the CaCu5-type phase is lower than that of the TbCu7-type one, enhanced remanence of the former has been observed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366501
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetostriction and susceptibilities of twinned single crystals of Terfenol-D : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 7276-7278 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements are presented of the dc magnetostriction, and both the ac and dc susceptibility along the three orthogonal axes of [112¯], [111], and [11¯0] from twinned single crystals of Terfenol-D as a function of varying compressive stress and magnetic field mutually applied along the [112¯] rod axis. The data are used in an attempt to analyze the magnetization processes occurring in such a specimen. The experimental results show clearly the two characteristics of the magnetization process corresponding to (i) the magnetostrictive "jump" effect, and (ii) the slow changes of magnetostriction occurring above the "jump." It is estimated that in stage (i) of the magnetization process, the domains aligned along the [111] axis by the applied stress rapidly and massively redistribute their moments both to the [111¯] direction closest to the applied field as well as to the [1¯11¯] and [11¯1¯] directions; and during stage (ii), the domains occupying the [1¯11¯] and [11¯1¯] directions redistribute to the [111¯] successively by non-180° domain-wall motion. However, two fine magnetization processes are found in the field range of the jump effect indicating that some domains must redistribute from the [111] to the [1¯11¯] and [11¯1¯] initially, then to the [111¯] even when the field is only increased in the initial stage (i). The nonzero susceptibilities measured along the [111] and [11¯0] suggest that both the volumes of parent and twin material as well as the probabilities for domain redistribution from one easy direction to the [1¯11¯] and [11¯1¯] might be different. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367617
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Characterization of ultrafine γ-Fe(C), α-Fe(C) and Fe3C particles synthesized by arc-discharge in methane (1998)
    Springer
    Journal of materials science 33 (1998), S. 1915-1919 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Ultrafine γ-Fe(C), α-Fe(C) and Fe3C particles were prepared by arc-discharge synthesis in a methane atmosphere. The phases, morphology, structure and surface layer of the particles were studied by means of X-ray diffraction (XRD), transmission electron microscopy (TEM) techniques and X-ray photoelectron spectroscopy (XPS). It was found that the mean particle size ranged from 9.8 to 12.8 nm. The surface of particles mostly consisted of a carbon layer and a little oxide. Phase transformation from γ-Fe(C) to α-Fe(C) was studied by annealing in vacuum and by differential thermal analysis and thermogravimetry (DTA–TGA) measurement. The abundance of γ-Fe(C) was determined by a magnetization measurement to be approximately 30%. Phase transformation occurred between 300 and 500 °C in a flowing argon atmosphere. The Fe3C particles oxidized to α-Fe2O3 and carbon dioxide at 610 °C or so. © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004369708540
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