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High Resolution Transmission Electron Microscopy of Metallic Film/Laser-Irradiated Alumina Couples.

Published online by Cambridge University Press:  15 February 2011

A. J. Pedraza ,
Siqi Cao ,
L. F. Allard  and
D. H. Lowndes
A. J. Pedraza
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996-2200
Siqi Cao
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996-2200
L. F. Allard
Affiliation:
High Temperature Materials Laboratory, Oak Ridge National Laboratory, Oak Ridge, TN 37831
D. H. Lowndes
Affiliation:
Solid State Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6056
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Abstract

A near-surface thin layer is melted when single crystal alumina (sapphire) is pulsed laserirradiated in an Ar-4%H2 atmosphere. γ-alumina grows epitaxially from the (0001) face of axalumina (sapphire) during the rapid solidification of this layer that occurs once the laser pulse is over. Cross sectional high resolution transmission electron microscopy (HRTEM) reveals that the interface between unmelted sapphire and γ-alumina is atomistically flat with steps of one to a few close-packed oxygen layers; however, pronounced lattice distortions exist in the resolidified γ-alumina. HRTEM also is used to study the metal-ceramic interface of a copper film deposited on a laser-irradiated alumina substrate. The observed changes of the interfacial structure relative to that of unexposed substrates are correlated with the strong enhancement of film-substrate bonding promoted by laser irradiation. HRTEM shows that a thin amorphous film is produced after irradiation of 99.6% polycrystalline alumina. Formation of a diffuse interface and atomic rearrangements that can take place in metastable phases contribute to enhance the bonding strength of copper to laser-irradiated alumina.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 357: Symposium C – Structure and Properties of Interfaces in Ceramics , 1994 , 53
Copyright
Copyright © Materials Research Society 1995

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