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Effects of elastic energy on the spinodal decomposition of InNAsP/InP heterostructures

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      Abstract

      Spinodal decomposition of the InNxAs yP1-x-y quaternary alloys lattice-matched to the InP as the result of the internal deformation and elastic energies is described. The alloys are represented as quasiternary regular solutions. The internal deformation energy is obtained from the interaction parameters between the constituent compounds estimated by the valence force field model. Ranges of spinodal decomposition of the InNxAs yP1-x-y alloys up to y ≤ 0.109 with and without elastic energy are demonstrated. Our results suggest that such energy prevents spinodal decomposition.

      Translated abstract

      Se describe la descomposición espinodal de las aleaciones cuaternarias InNxAs yP1-x-y crecidas sobre InP como resultado de las energías de deformación interna y elástica. Las aleaciones se representan como soluciones cuasiternarias regulares. La energía de deformación interna se obtiene de los parámetros de interacción entre los compuestos que forman la aleación estimados por el modelo de campo de fuerza de valencia. Se muestran los rangos de descomposición espinodal de las aleaciones InNxAs yP1-x-y con y sin la energía elástica hasta y ≤ 0.109. Nuestros resultados sugieren que tal energía previene la descomposición espinodal.

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      Most cited references 23

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      The Local Compressibility of Liquids near Non-Adsorbing Substrates: A Useful Measure of Solvophobicity and Hydrophobicity?

      We investigate the suitability of the local compressibility chi(z) as a measure of the solvophobicity or hydrophobicity of a substrate. Defining the local compressibility as the derivative of the local one-body density w.r.t. the chemical potential at fixed temperature, we use density functional theory (DFT) to calculate chi(z) for a model fluid, close to bulk liquid-gas coexistence, at various planar substrates. These range from a `neutral' substrate with a contact angle of approximately 90 degrees, which favours neither the liquid nor the gas phase, to a very solvophobic, purely repulsive substrate which exhibits complete drying (i.e. contact angle 180 degrees). We find that the maximum in the local compressibility, which occurs within one-two molecular diameters of the substrate, and the integrated quantity chi_ex (the surface excess compressibility, defined below) both increase rapidly as the contact angle increases and the substrate becomes more solvophobic. The local compressibility provides a more pronounced indicator of solvophobicity than the density depletion in the vicinity of the surface which increases only weakly with increasing contact angle. When the fluid is confined in a parallel slit with two identical solvophobic walls, or with competing solvophobic and solvophilic walls, chi(z) close to the solvophobic wall is altered little from that at the single substrate. We connect our results with simulation studies of water near to hydrophobic surfaces exploring the relationship between chi(z) and fluctuations in the local density and between chi_ex and the mean-square fluctuation in the number of adsorbed molecules.
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        Bonds and Bands in Semiconductors: New insight into covalent bonding in crystals has followed from studies of energy-band spectroscopy

         J. Phillips (1970)
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          Phys. Rev. B

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            Author and article information

            Affiliations
            [1 ] Instituto Politécnico Nacional Mexico
            [2 ] Instituto Politécnico Nacional Mexico
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Journal
            rmf
            Revista mexicana de física
            Rev. mex. fis.
            Sociedad Mexicana de Física (México )
            0035-001X
            February 2011
            : 57
            : 1
            : 17-19
            S0035-001X2011000100003

            http://creativecommons.org/licenses/by/4.0/

            Product
            Product Information: SciELO Mexico
            Categories
            Physics, Multidisciplinary

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