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  • American Physical Society  (254)
  • American Institute of Physics  (126)
  • American Institute of Physics (AIP)  (41)
  • 1
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    Monte Carlo simulation of depth and lateral profiles of boron atoms implanted in polycrystalline silicon (1977)
    American Institute of Physics
    Details
    Publication Date: 1977-04-01
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Magnetic property of GdCo4B in high field : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5914-5916 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Temperature dependence of saturation magnetization and magnetization process of a field oriented sample in a pulsed field up to 13T at several temperatures are measured for GdCo4B. The following main conclusions have been obtained: (1) the Curie temperature and the compensation point are 517 K and 421 K, respectively, (2) the averaged Co-moment is 1.04 μB, suggesting the 6i-Co has about a half of that of the 2c-site Co, (3) the exchange parameter between Gd and Co spins, JGd-Co/k, is estimated to be 8.5 K from the temperature dependence of Gd-sublattice magnetization, (4) Gd-sublattice anisotropy constants have been estimated as follows; 5.8×106 erg/c.c. at T=78 K, 3.9×106 erg/c.c. at T=147 K and 2.9×106 erg/c.c. at T=225 K, which are well explained by Gd–Gd and Gd–Co dipole–dipole interactions, and (5) the anisotropic saturation moment has been observed and can be attributed to anisotropic Co moment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353519
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic study of SmCo5, PrCo5, SmCo4B, and Sm3Co11B4 under pulse high field : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6128-6130 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization curves and hysteresis loops for field-oriented powders of Smn+1Co3n+5B2n (n=0, 1, and 3) and PrCo5 were measured at T=4.2 K and partly at 77 K, under a strong pulsed field up to 36 T. Magnetic measurements for Smn+1Co3n+1B2n (n=1, 2, and 3) compounds were also performed. Huge anisotropy fields of 120 T for SmCo4B and of 130 T for Sm2Co7B3 were obtained. The Sm sublattice anisotropy of SmCo4B was found to be larger than that of SmCo5. To explain this, the Sm f-electron state for n≥ (R18)2 of Smn+1Co3n+5B2n has been expected to change from that for n≤1. Huge coercivities of 8 T and 27.5 T were observed at T=4.2 K for SmCo4B and for Sm2Co7B3 respectively. Magnetization processes for field-oriented PrCo5 at T=4.2 K were found to be similar to those of Nd2Fe14B at T=4.2 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350018
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic characteristics of the Sm1−xPrxCo4−yFeyB system : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6269-6271 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic properties of Sm1−xPrxCo4−yFeyB with various values of x and y have been observed mainly from the viewpoint of permanent magnet material. Pr substitution for SmCo4B results in an increase of the saturation moment; however, it leads to a decrease of the anisotropy field. The Curie temperature remains constant. On the other hand, the Fe substitution increases both the Curie temperature and the saturation moment significantly, and does not give vital damage to the original huge anisotropy field of SmCo4B. A possibility of the above system for a candidate of permanent magnet material is discussed in addition to discussion of the fundamental magnetic properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352666
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  • 5
    Electronic Resource
    Electronic Resource
    The role of boron in Rn+1Con+5B2n systems (R=Y, Sm, Dy; n=0, 1, 2, 3, and ∞) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5911-5913 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic measurements have been made for the systems of Rn+1Co3n+5B2n (R=Y, Sm, Dy; n=1, 2, 3, 4, and ∞) in wide temperature region. The Curie temperature decreases drastically between n=0 and n=1, and slowly with n larger than 1, for all above systems. Three kinds of Co sites with different magnetic moments are proposed. The estimated Sm- and Dy-atomic moments are found to be smaller than the free ion moments in the Dy system with n≥1 and in the Sm system. Magnetic anisotropy constants K1(Co) and K2(Co) have been determined at various temperatures for the Y system, and the Sm-sublattice anisotropy constants K1(Sm) have been estimated and found to take the maximum value at n=1 and decrease with n≥1 in the Sm system. Magnetic anisotropy in the Dy system is found to be planar at all temperatures below the Curie temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354067
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  • 6
    Electronic Resource
    Electronic Resource
    Rotational isomerism of molecules in condensed phases (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 2688-2695 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A statistical mechanical model is developed for the description of the conformational distribution of organic molecules in the liquid and solid phases. In the model, they are assumed to have one internal freedom of rotation. The molecules are fixed to lattice sites and have two types of ordering, conformational and distributional. The latter is supposed to represent an ordering typical of solid state. The model is compared with the experimental results of the rotational-isomeric ratio of 1,2-dichloro-1,1-difluoroethane, in the temperature range from 77 to 300 K. It explains successfully the experimental results, especially the behavior near the melting point. From the point of view of melting, the present model is an extension of the Lennard-Jones and Devonshire model, because, when the distinctions between the two conformers are neglected, the parameter representing the distributional ordering of the molecules results in the same equation as that derived from the Lennard-Jones and Devonshire model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460920
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  • 7
    Electronic Resource
    Electronic Resource
    Ionic conductivity and mobility in network polymers from poly(propylene oxide) containing lithium perchlorate (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 123-128 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ionic conductivity σ and mobility μ in the amorphous network polymers from poly(propylene oxide) (PPO) containing lithium perchlorate (LiClO4) at the concentration of [LiClO4]/[PO unit]=0.042 and 0.076 were investigated by means of complex impedance and time-of-flight methods. The σ values of the PPO–LiClO4 complexes reached 10−5 S cm−1 at 70 °C. The temperature dependence of σ deviated from a single Arrhenius behavior above a critical temperature (−1 °C and 11 °C) which approximately corresponded to the glass transition temperature Tg. The μ values were relatively high and changed from 10−6 to 10−5 cm2 V−1 s−1 in the temperature range of 40–100 °C. The Nernst–Einstein equation correlated μ with the ionic diffusion coefficient D. The Williams–Landel–Ferry equation with C1(approximately-equal-to)5 and C2(approximately-equal-to)30–50 held with a temperature dependence of D in the order of 10−8–10−7 cm2 s−1. The change in the number of ionic carriers n with temperature obeyed the Arrhenius equation with the activation energy of 0.26 and 0.34 eV. The degree of dissociation for LiClO4 in the PPO networks was 1–6%, and the dissociation was facilitated in the low LiClO4 concentration complex. The temperature dependence of σ above Tg was interpreted quantitatively in terms of n and μ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335386
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  • 8
    Electronic Resource
    Electronic Resource
    The microwave rotational spectrum of the Ar–CO dimer (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 9399-9404 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Pure rotational spectra of four different isotopomers of the dimer Ar–CO have been investigated between 8 and 18 GHz using a pulsed beam cavity Fourier transform spectrometer. The spectra confirm that the complex is a prolate near-symmetric rotor with an essentially T-shaped structure, and that it undergoes large amplitude zero-point motion. It is shown that on the average the argon is closer to the oxygen than to the carbon. The transitions measured obey a-type selection rules with ΔJ=+1, ΔKa=0, and ΔKc=+1. For 40Ar–12C16O, transitions have been observed for Ka=0 and 1 with lower state J values of 1, 2, and 3. For 40Ar–13C16O and 40Ar–13C18O, a similar series was measured, but only for Ka=0. For 40Ar–13C17O, the 17O quadrupole hyperfine pattern was resolved in the rotational transition JKaKc = 202–101. Determinations have been made for rotational and centrifugal distortion constants, as well as for the 17O quadrupole coupling constant χaa. Effective values have been obtained for the length of the line from the center of mass of the CO subunit to the argon nucleus, and for the angle between this line and the CO bond.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464371
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  • 9
    Electronic Resource
    Electronic Resource
    Role of atomic charge transfer on sintering of TiO2 nanoparticles: Variable-charge molecular dynamics (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 6011-6015 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability of surface structure and space-charge distribution in free TiO2 nanoparticles are investigated for both rutile and anatase phases using a variable-charge interaction potential in which atomic charges vary dynamically depending on their environment. We find the dynamic charge transfer: (i) enhances atomic diffusion at surfaces of the spherical nanoparticles at high temperatures; and (ii) creates additional repulsive force between the two nanospheres through formation of a double-charge surface layer in each nanosphere. The surface diffusion due to the charge transfer clearly distinguishes the two nanospheres with different underlying crystalline structures; the surface diffusion constant of the anatase sphere is almost three times as great as that of the rutile sphere. Variable-charge molecular dynamics simulations are then applied to sintering of two TiO2 nanospheres. It turns out that the enhanced surface diffusion in the anatase nanosphere at high temperatures significantly promotes neck formation between the two spheres. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1321785
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  • 10
    Electronic Resource
    Electronic Resource
    Variable-charge interatomic potentials for molecular-dynamics simulations of TiO2 (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 3036-3041 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An interatomic potential model has been developed for molecular-dynamics simulations of TiO2 (rutile) based on the formalism of Streitz and Mintmire [J. Adhes. Sci. Technol. 8, 853 (1994)], in which atomic charges vary dynamically according to the generalized electronegativity equalization principle. The present model potential reproduces the vibrational density of states, the pressure-dependent static dielectric constants, the melting temperature, and the surface relaxation of the rutile crystal, as well as the cohesive energy, the lattice constants, and the elastic moduli. We find the physical properties of rutile are significantly affected by dynamic charge transfer between Ti and O atoms. The potential allows us to perform atomistic simulations on nanostructured TiO2 with various kinds of interfaces (surfaces, grain boundaries, dislocations, etc.). © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371165
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