Physics – Condensed Matter – Materials Science
Scientific paper
1999-01-28
Thin Solid Films 354 (1999) 267-275
Physics
Condensed Matter
Materials Science
29 pages including 7 figures, to be published in Thin Solid Films
Scientific paper
10.1016/S0040-6090(99)00026-7
The short-time stability of concentration profiles in coherent periodic multilayers consisting of two components with large miscibility gap is investigated by analysing stationary solutions of the Cahn-Hilliard diffusion equation. The limits of the existence and stability of periodic concentration profiles are discussed as a function of the average composition for given multilayer period length. The minimal average composition and the corresponding layer thickness below which artificially prepared layers dissolve at elevated temperatures are calculated as a function of the multilayer period length for a special model of the composition dependence of the Gibbs free energy. For period lengths exceeding a critical value, layered structures can exist as metastable states in a certain region of the average composition. The phase composition in very thin individual layers, comparable with the interphase boundary width, deviates from that of the corresponding bulk phase.
Bobeth Manfred
Diener Gerhard
Hentschel Martina
Pompe Wolfgang
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