Abstract
The incorporation of solvent lead ions in LPE grown garnet layers is investigated by means of film misfit measurements and EPMA in dependence on growth conditions. It is shown that the lead incorporation is essentially due to kinetical effects rather than the consequence of thermodynamic equilibrium. In particular, the lead content increases rapidly with the growth rate according to a linear function. The temperature dependence of the ascent of this function can be described by an Arrhenius law. It is shown that trapping models being in common use fail in explaining the results whereas a reasonable description can be achieved within the frame of an alternative trapping theory based on the SOS-lattice model. Der Einbau von Bleiionen des Losungsmittels in LPE-Granatschichten wird in Abhangigkeit von den Wachstumsbedingungen mit Hilfe von Misfitmessungen und EPMA untersucht. Es wird gezeigt, das der Bleieinbau im wesentlichen durch kinetische Effekte verursacht wird. Insbesondere steigt der Bleigehalt linear mit der Wachstumsrate an. Die Temperaturabhangigkeit dieses Anstieges kann mit einem Arrheniusgesetz beschrieben werden. Es wird gefunden, das die ublich verwendeten Trappingmodelle die Ergebnisse nicht erklaren konnen. Eine vernunftige Beschreibung der Resultate ist dagegen mit einer alternativen Trappingtheorie moglich, welche auf dem SOS-Gittermodell basiert.
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