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  • 1
    Electronic Resource
    Electronic Resource
    Plastic relaxation of metamorphic single layer and multilayer InGaAs/GaAs structures (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 839-841 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The plastic relaxation of multilayer structures of strained InGaAs grown above critical thickness on GaAs is reported and compared with the relaxation of single layers and with theory. We show that a composite structure, taken as a whole, follows the same relaxation law as observed in single layers. However, departures of the strains of some component layers from theory show that misfit dislocations are easily pinned at an interface. Implications for the design of relaxed buffer layer growth are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112177
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular dynamics and mean spherical approximation results for symmetric nonadditive hard core Yukawa mixtures (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 560-565 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The thermodynamic properties of some symmetric hard core Yukawa mixtures with positively and negatively nonadditive diameters are studied by molecular dynamics (MD) simulation, and the results compared with the predictions of the mean spherical approximation (MSA). MSA results for the compressibility factors are obtained by taking as reference the semiempirical equation of state proposed by Gazzillo and Pastore for symmetric nonadditive hard sphere fluids. Our calculations show that the "exact'' computer simulation data are, in general, closely approximated by the MSA energy route to the thermodynamic properties. For the largest positive nonadditivity considered in this paper, some discrepancies appear between the compressibility factors obtained by MD and the MSA, but it is shown that the origin of the discrepancies lies in the hard core part of the compressibility factor rather than in the MSA theory of liquids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466973
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  • 3
    Electronic Resource
    Electronic Resource
    Stress annealing in Fe73.5Cu1Ta3Si13.5B9 amorphous alloy: Induced magnetic anisotropy and variation of the magnetostriction constant (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1131-1134 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of Joule heating anneals, carried out with the simultaneous application of a mechanical stress (stress-current annealing), on the anisotropy and magnetostriction of Fe73.5Cu1Ta3Si13.5B9 amorphous samples is investigated. As a result of these thermal treatments an uniaxial in-plane magnetic anisotropy, characterized by the constant Kσ, was induced in the samples. The dependence of Kσ on the annealing temperature shows a maximum around 450 °C which can be connected to the first stages of the crystallization process. From the measurement of the stress dependence of the magnetization work Wm, the magnetostriction constant λs of the as-quenched and thermally treated samples was also evaluated. The results obtained show how the presence of two phases in the partially crystallized material determines the magnetoelastic behavior of these samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357834
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  • 4
    Electronic Resource
    Electronic Resource
    Polarizing effects of magnetization on the crystallization of Co100−xPx amorphous alloys : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5372-5374 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results are presented on the microstructure and magnetic properties of samples obtained by crystallization of amorphous films of composition Co100−xPx (10〈x〈25). Microstructural studies by means of scanning electron microscopy, x-ray diffractometry, as well as magnetic measurements showed the presence of a well-defined texture in the cobalt crystallites of samples of composition given by x〈21, the easy axis direction of the amorphous samples being preserved during the crystallization. In these samples the thermal dependence of the coercive and anisotropy fields and of the remanence was studied. The crystallization product of samples of composition given by x(approximately-greater-than)21 is characterized by the presence of cobalt crystallites with random easy axes distribution. The polarizing effect of the magnetization was evidenced through the correlation between the two different types of microstructure and the presence or absence of magnetic order during the crystallization of the samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353734
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of the deformation potentials of GaAs0.80P0.20 (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1951-1953 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Deformation potentials can be determined by measuring the variation of the energy of the electronic transitions with strain. In this work, the hydrostatic and shear potentials of the band-gap electronic transition (E0) and the transitions along the 〈111〉 direction (E1) of GaAs1−xPx, x≈0.20, have been determined by electroreflectance characterization of GaAs1−xPx layers with different levels of strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357653
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  • 6
    Electronic Resource
    Electronic Resource
    A study of binary hard core Yukawa mixtures by molecular dynamics and the mean spherical approximation (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 5121-5125 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The static bulk properties of several types of binary mixtures of hard spheres interacting through an attractive Yukawa tail are studied by molecular dynamics (MD) simulation, and the results compared with the predictions of the mean spherical approximation (MSA) using the energy, compressibility, and virial routes. For mixtures with components of equal diameter, our MD results differ significantly, under certain working conditions, from recently reported results of Monte Carlo calculations. For both these mixtures and mixtures with appreciable size mismatch, comparison with the MSA results shows that the "exact'' MD data are always more closely approximated by the energy route. These results, which are all consistent with those of a previous study of pure Yukawa fluids, show that, using the energy route, the MSA allows good description of the thermodynamic properties of binary Yukawa mixtures, even in situations departing considerably from ideality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463834
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  • 7
    Electronic Resource
    Electronic Resource
    Structure and thermodynamics of mixtures of hard D-dimensional spheres: Overlap volume function approach (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 5132-5141 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A very simple ansatz for the partial direct correlation functions of binary mixtures of hard D-dimensional spheres, which allows a unified treatment of both the odd and even space dimensionalities D and reduces, for D=1 and D=3, to the Percus–Yevick theory is presented in this paper. A generalized Carnahan–Starling equation of state is proposed, which is in excellent agreement with the available computer simulation results. Finally, two generalized Verlet–Weis procedures for the partial pair distribution functions gij(r) are proposed. The interesting case of hard disks (D=2) is studied in detail leading to excellent results for the gij(r).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463810
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  • 8
    Electronic Resource
    Electronic Resource
    Electrostatic trapping of a colloidal monolayer near a charged wall (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 1480-1486 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The structure of a model colloidal suspension in the vicinity of a charged wall is studied in the framework of the Derjaguin–Landau–Verwey–Overbeek interaction potential and the hypernetted-chain approximation. Here we consider the case of dilute suspension of highly charged macroparticles interacting with weakly repulsive, neutral, and attractive walls. As the wall–particle electrostatic interactions become successively less repulsive, the formation of a monolayer of colloidal particles, strongly adsorbed onto the surface, is predicted by our results. This monolayer of electrostatically confined particles mimic the effect of an effective surface charge distribution adjacent to the wall which, together with the bare wall surface charge, induces on the other, nonconfined, colloidal particles the same local-concentration profile as that in front of a highly charged and repulsive wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460007
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  • 9
    Electronic Resource
    Electronic Resource
    On the potential energy surface for collinear OH+2 (4Σ−) (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 3774-3777 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The potential energy surface for collinear OH+2 (4Σ−) has been investigated at the configuration interaction (CI) level using large primitive basis sets of Gaussian type orbitals (GTO) and the general atomic natural contraction (ANO). The CI calculations were carried out using the CIPSI algorithm and the accuracy established by comparison with full CI (FCI) test calibrations on the atoms and molecules of interest in the present work. For the reaction O+(4Su)+H2(1Σ+g)→OH+(3Σ−)+H(2Sg) the calculated value for the energy change of the reaction (ΔE) is −0.30 eV to be compared with an experimental value of −0.45 eV. The error in ΔE arises from the error in the ionization potential of oxygen and does only affect the reactants but not the products, while the discrepancy with the experiment is limited by the finite size of the basis set and not by truncations on the CI expansion. The collinear OH+2 minimum has been found to lie 0.338 eV below the products with an estimated accuracy of 0.01 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459749
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  • 10
    Electronic Resource
    Electronic Resource
    Electrokinetic flow in ultrafine slits: Ionic size effects (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 2219-2231 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The equilibrium density profiles for the restricted primitive model (RPM) for electrolytes, which takes into account the ionic size, are used to calculate several electrokinetic quantities for a 1:1 ionic solution in a charged slit. The three-point-extension hypernetted-chain–mean-spherical equation is used to calculate the RPM density profiles. The results are compared to those obtained through the Poisson–Boltzmann equation for a point-ion model. Important quantitative and qualitative differences are found for ultrafine slits. These differences, as well as the general behavior of the electrokinetic quantities, are explained in terms of the structure of the electrical double layer inside the slit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459892
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