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  • 11
    Digitale Medien
    Digitale Medien
    Kinetics of first-order phase transitions in the asymptotic stage (1998)
    Springer
    Journal of experimental and theoretical physics 86 (1998), S. 1201-1208 
    Details
    ISSN: 1090-6509
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We construct an asymptotic theory that describes the kinetics of first-order phase transitions. The theory is a considerable refinement of the well-known Lifshits-Slezov theory. The main difference between the two is that the Lifshits—Slezov theory uses for the first integral of the kinetic equation an approximate solution of the characteristic equation, which is valid in the entire range of sizes except for the blocking point, i.e., it uses a nonuniformly applicable approximation. At the same time, the behavior of the characteristic solution near the blocking point determines the asymptotic behavior of the size distribution function of the nuclei for the new phase. Our theory uses a uniformly applicable solution of the characteristic equation, a solution valid at long times over the entire range of sizes. This solution is used to find the asymptotic behavior of all basic properties of first-order phase transitions: the size distribution function, the average nucleus size, and the nucleus density.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.558591
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  • 12
    Digitale Medien
    Digitale Medien
    Self-excited oscillatory regimes in the growth of thin films from a multicomponent vapor: Dynamics and control (1997)
    Springer
    Technical physics 42 (1997), S. 1027-1030 
    Details
    ISSN: 1090-6525
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A model system describing the nucleation of films from a multicomponent vapor with allowance for chemical reactions between different components in the initial phase is investigated in detail. It is shown that the condensation of thin films can proceed by different avenues, depending on the values of external parameters such as the temperature or the precipitation rate of particles of the component that limits the chemical reaction. In particular, low precipitation rates are characterized by a stable condensation regime, in which any deviations from equilibrium die out. At medium precipitation rates the phase transition takes place in a self-excited oscillatory regime corresponding to a stable limit cycle. Finally, at high precipitation rates the stable limit cycle breaks up, and the new phase usually condenses in a sawtooth (accretion) regime. A procedure is developed for controlling the given oscillatory processing by judicious time variation of the external parameters. The investigated system is found to have a special kind of memory in that for external parameters with identical values but different histories the films condense differently; even a slight difference in the past behavior of the external parameters can lead to different precipitation regimes. It is concluded that these memory effects are in fact responsible for the poor reproducibility encountered in some cases of experiments on film growth utilizing chemical reactions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1258739
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  • 13
    Digitale Medien
    Digitale Medien
    Inclusion of a nonzero volume fraction of the new phase in the kinetics of crystallization of melts (1999)
    Springer
    Technical physics 44 (1999), S. 786-791 
    Details
    ISSN: 1090-6525
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The growth rate of nuclei is calculated in self-consistent mean field approximation with allowance for the screening of a selected nucleus from heat fluxes, and an expression is obtained for the screening length of the heat flux. It is shown that the growth rate of a nucleus depends on the degree of crystallization of the melt. The influence on the crystallization process of collisions of the particles as they coalesce into a polycrystalline solid is investigated. A refinement of the size distribution function in the thermal Ostwald ripening stage is obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1259348
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  • 14
    Digitale Medien
    Digitale Medien
    Formation and evolution of the phase composition and associated properties during the growth of thin films (1997)
    Springer
    Technical physics 42 (1997), S. 1212-1219 
    Details
    ISSN: 1090-6525
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A complete system of equations describing the evolution of the phase composition of islands in the Ostwald ripening stage during the growth of thin films is derived and a solution is found. The distribution function of islands of solid solutions is obtained for different growth mechanisms. A general approach to controlling the phase composition and associated properties (electrical, optical, strength, and so on) in the multicomponent systems formed is developed. The investigation is conducted for the example of thin multicomponent films. It is shown that the greatest possibilities for controlling these properties are at the Ostwald ripening stage and in the presence of nonlinear phenomena such as self-oscillation or self-organization. A relation is found between the size and composition of the new-phase nuclei which form during the condensation of films of solid solutions. A system of equations describing the evolution of the distribution function of properties in island films of solid solutions as a function of the external parameters of the system is derived and solved. It is shown that a strong dependence of the composition on the external parameters appears for islands with radius R⩽10−8 m, irrespective of the type of material. A diagram of the coexistence of the corresponding properties in concentration-temperature coordinates is constructed for island films of stoichiometric compounds; this makes it possible to determine the necessary conditions for obtaining such films. It is predicted that various properties in multicomponent systems which undergo a first-order phase transition can vary periodically in time and space.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1258824
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  • 15
    Digitale Medien
    Digitale Medien
    Mechanisms and kinetics of the initial stages of growth of films grown by chemical vapor deposition (1998)
    Springer
    Technical physics 43 (1998), S. 846-852 
    Details
    ISSN: 1090-6525
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The initial stages of growth of films and coatings by chemical vapor deposition are investigated. A system of equations is derived which describes the evolution of an island film at the stage of Ostwald ripening under conditions characteristic of vapor deposition. Solving this system of equations yields the dependence of all of the main characteristics of island films (the size distribution function of the islands, the dependence of the mean radius and density of the islands) as functions of time and the spatial coordinate. Suggestions are given for the preparation of films with prescribed properties.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1259082
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  • 16
    Digitale Medien
    Digitale Medien
    Effect of quaternization on regioselectivity of arylamination of naphthylazobenzimidazoles (1988)
    Springer
    Chemistry of heterocyclic compounds 24 (1988), S. 1187-1187 
    Details
    ISSN: 1573-8353
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00475702
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