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Published May 2013 | public
Journal Article

Solid-state dewetting of thin iron films on sapphire substrates controlled by grain boundary diffusion

Abstract

The initial stages of solid-state dewetting of 25 nm-thick Fe films on basal plane-oriented sapphire substrates were found to occur via nucleation and growth of through-thickness craters within the film. The rims along these voids were not elevated, in contrast to commonly observed void growth mechanisms. Instead, the material that was consumed during the crater expansion was absorbed by several isolated grains in its vicinity but not adjacent to it. These grains transformed into faceted hillocks that protruded above the original film surface at later stages. A thin film dewetting model is proposed, in which the self-diffusion of Fe atoms along the grain boundaries transports the mass from the expanding cavities to the hillocks and determines the kinetics of this dilation. The grain boundary self-diffusion coefficients of Fe that were estimated based on the experimentally determined crater expansion rates and the proposed model agreed well with the literature.

Additional Information

© 2013 Acta Materialia Inc. Published by Elsevier Ltd. Received 14 October 2012; accepted 28 January 2013 Available online 16 March 2013. This work was supported by the US–Israel Binational Science Foundation, Grant No. 2010148, and by the Russell Berry Nanotechnology Institute at the Technion. The helpful advice and assistance of Dr. L. Klinger, Mr. M. Kazakevich, Mr. D. Amram and Ms. L. Popilevsky are heartily acknowledged.

Additional details

Created:
August 22, 2023
Modified:
October 24, 2023