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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic and crystallographic properties of the permanent magnet systems (R1−xScx)2Fe14B (R=Y, Nd, Dy, Er, Lu) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5546-5548 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic and crystallographic measurements have been made on the rare-earth iron boride systems (R1−xScx)2Fe14B (R=Y, Nd, Dy, Er, Lu). Powder x-ray diffraction data indicate that a Nd2Fe14B-type single phase persists up to x=0.2 with lattice parameters decreasing slightly due to the smaller metallic radius of the Sc3+ ions. The variation of magnetic moments per formula unit with nonmagnetic Sc substitution depends on the smaller Sc size and the nature of the magnetic alignment of the rare-earth sublattice (nonmagnetic in Y and Lu, ferromagnetic axial in Nd, ferromagnetic planar in Er, and antiferromagnetic axial in Dy) with respect to the iron sublattice. The Curie temperature TC decreases monotonically with progressive addition of Sc atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342331
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic properties and microstructure of magnesium-doped Nd-Fe-B magnets (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5513-5515 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A number of Nd15 Fe79−x Mgx B6 magnets with x up to 0.41 and pseudoternary Nd2(Fe1−yMgy)14B compounds with y up to 0.081 have been prepared by conventional powder metallurgy processes. Magnetic measurements indicate that for the magnet alloys i Hc increases as x increases up to 0.25 without a loss in Br, hence the (BH)max values are slightly enhanced. The maximum increase in i Hc is about 15% for x=0.25. Extensive Mg-rich precipitates inside the Nd-rich phase have been observed by electron probe microanalysis (EPMA). Higher Mg intensity at grain boundaries is also detected by EPMA. The reasons for the i Hc increase might be the grain boundary cleaning ability of Mg dopant. For the pseudoternary compounds, the anisotropy field HA is found to increase only slightly due to Mg doping while TC remains practically unchanged.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342320
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  • 3
    Electronic Resource
    Electronic Resource
    Structural and magnetic studies of Er2Fe17−xMxCy (M=Ga and Al) compounds : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5533-5535 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of Ga and Al substitution for Fe on the structural and magnetic properties of the Er2Fe17−xMxCy (M=Ga, Al; x=0–4, y=0–2) compounds was investigated. It was found that Ga is superior to Al in stabilizing the single-phase Er2Fe17−xMxCy compounds. The hexagonal Th2Ni17-type structure persisted in almost all alloys with the exception of Er2Fe13Ga4C and Er2Fe13Ga4C2. These two compounds exhibited a rhombohedral Th2Zn17 structure. Both the Curie temperature and magnetization can be enhanced with a certain amount of Ga or Al substitution. But they decreased almost monotonically with the increase of Ga or Al content in Er2Fe17−xMxCy (x(approximately-greater-than)1, y(approximately-greater-than)0). The spin reorientation temperature, Tsr, was influenced by both carbon interstitial and Ga or Al substitution for Fe and ascribed to the increase of the c-axis uniaxial anisotropy of the Er3+ sublattice by the modification of electron structure around it. The highest Tsr of 241 K appears in the compound Er2Fe14Ga3C. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362300
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  • 4
    Electronic Resource
    Electronic Resource
    Nanocomposite Sm2Co17/Co permanent magnets by mechanical alloying : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5964-5966 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mechanically alloyed magnets SmCox (x=6.0–11.0) have been prepared using starting materials of commercial SmCo5 and Co powders. X-ray diffraction data indicate that the equilibrium Sm2Co17 phase can be achieved in a nanocomposite Sm2Co17/Co system at x=8.5–11.0, while a Sm2Co17/SmCo5 structure occurs at x=6.0–8.0. The best magnetic properties obtained at x=10.0 are as follows: (BH)max=10.2 MGOe, Br=9.4 kG, Hc=4.0 kOe, and S=0.82. Wohlfarth's remanence analysis indicates that the high remanence can be attributed to the intergranular interaction between neighboring cobalt and Sm2Co17 grains. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362121
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  • 5
    Electronic Resource
    Electronic Resource
    Coercivity of Ti-modified (α-Fe)-Nd2Fe14B nanocrystalline 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. 7071-7073 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Coercivity of Ti-modified nanocrystalline (α-Fe)-Nd2Fe14B alloys with soft iron particles embedded in hard Nd2Fe14B matrix was studied. The alloys were prepared by melt spinning and annealing. The grain size of Nd2Fe14B is from 20 to 60 nm, while that of the soft iron particles is 11 to 30 nm. The coercivity of the annealed flakes decreased dramatically with increasing particle size of free iron, following the same tendency of a theoretical calculation by Schrefl et al. For the Ti-alloyed flakes, the 1 at. % Ti-containing ones show the highest coercivity of 11.1 kOe. Its (BH)m value is about 16 MGOe despite lower Nd and B contents than stoichiometric Nd2Fe14B. More Ti addition would deteriorate the coercivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358030
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  • 6
    Electronic Resource
    Electronic Resource
    Structural and magnetic properties of pseudoternary Nd2(Fe1−xCux)14B compounds (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 2739-2741 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic and crystallographic measurements have been made on new pseudoternary compounds Nd2(Fe1−xCux)14B in order to study the systematic variation of magnetic properties with Cu substitution. X-ray powder diffraction data indicate that the tetragonal Nd2Fe14B-type phase exists only for x≤0.05. Partial replacement of Fe by nonmagnetic Cu significantly decreases the saturation magnetization value with little change in ferromagnetic Curie temperature TC. Low-temperature spin orientation temperature (Tsr) decreases from 135 K for x=0.00 to 130 K for x=0.03, and 122 K for x=0.05, and the tilt angle of the easy magnetization direction from the tetragonal c axis decreases accordingly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340969
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic properties and microstructure of Fe4N and (Fe,Ni)4N : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6247-6249 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-phase Fe4N and (Fe1−xNix)4N compounds have been synthesized in a continuous form by heat treating iron and iron-nickel alloy sheets at various temperatures under NH3/H2 atmospheres. The Fe4N sheet has a high room-temperature magnetization value of 179 emu/g (2.14 μB/Fe), which is only slightly less than 218 emu/g (2.19 μB/Fe) observed in pure iron. The magnetic moments of the Fe-Ni alloy nitrides decreased monotonically as x was increased, in contrast to those for the starting alloys Fe1−xNix which exhibited a peak value around x=0.05. The decrease in magnetic moment with nickel content in the alloy nitrides was close to the value anticipated by magnetic dilution from nickel. The coercive force is about 5 Oe and is slightly decreased by the Ni substitution. The Fe-nitride offers a significantly improved corrosion resistance over pure iron. Even further improvement is obtained in the (Fe1−xNix)4N system with only slight sacrifice in magnetic moment. The addition of nickel has been found to noticeably improve the mechanical ductility of the normally brittle Fe4N compound. Theses nitrides also exhibit significantly increased electrical resistivity and wear resistance, and may be useful for a variety of technological applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350010
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  • 8
    Electronic Resource
    Electronic Resource
    Coercivity and transmission electron microscopy study of nanocomposite Sm–Co powders by mechanical alloying : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5631-5633 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A nanocomposite Sm2Co17/Co magnet with a composition of Sm7Co93 was prepared by mechanical alloying. A domain–wall pinning mechanism was found to be dominant in the magnet, as investigated using Kronmüller's micromagnetic theory. Transmission electron microscopy micrographs indicate that the half width between neighboring Co grains is about 40 nm. This value is two times larger than the range factor, r0, obtained from Kronmüller's model. It appears that crystallographic defects other than the cobalt particles also play an important role in coercivity. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364623
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  • 9
    Electronic Resource
    Electronic Resource
    Exact transient analysis of an anti-plane semi-infinite crack subjected to dynamic body forces
    Amsterdam : Elsevier
    Wave Motion 17 (1993), S. 161-171 
    Details
    ISSN: 0165-2125
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0165-2125(93)90022-8
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  • 10
    Electronic Resource
    Electronic Resource
    Combining MAGEX with random phases (1992)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 48 (1992), S. 9-11 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: An algorithm is described which combines the magic integer concept with that of representing a large number of phases by random numbers. The process, called MAGEX89, is more economical than previous magic integer approaches and in a number of tests its performance compares favourably with those of other commonly used methods of solving small structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767391007286
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