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Effects of Titanium Doping on Surface Properties of Alumina

Published online by Cambridge University Press:  15 February 2011

James D. Powers ,
Lawrence Kulinsky ,
Mikito Kitayama  and
Andreas M. Glaeser
James D. Powers
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, and Center for Advanced Materials, Lawrence Berkeley Laboratory, Berkeley, CA 94720-1760
Lawrence Kulinsky
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, and Center for Advanced Materials, Lawrence Berkeley Laboratory, Berkeley, CA 94720-1760
Mikito Kitayama
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, and Center for Advanced Materials, Lawrence Berkeley Laboratory, Berkeley, CA 94720-1760
Andreas M. Glaeser
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, and Center for Advanced Materials, Lawrence Berkeley Laboratory, Berkeley, CA 94720-1760
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Abstract

Controlled-geometry pore structures were introduced into undoped and Ti-doped sapphire using microfabrication techniques, and subsequently transferred to internal sapphire-sapphire and sapphire-polycrystalline alumina interfaces via hot pressing. The high-temperature evolution of several different types of structures was examined, in order to isolate different surface properties and evolution processes which are of interest during sintering. A study of pore channel breakup showed that Ti strongly stabilizes channels oriented in the sapphire [1100] direction, suggesting a significant alteration of the Wulff plot. In another study, the equilibration rate of isolated pores was enhanced in Ti-doped sapphire; as glassy phases are unlikely in this material, a solid-state diffusion mechanism for this enhancement is suggested. The evolution of pore channels with pre-existent perturbations was also studied, and the results of these studies are presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 357: Symposium C – Structure and Properties of Interfaces in Ceramics , 1994 , 313
Copyright
Copyright © Materials Research Society 1995

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