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Interfacial precipitation in titania-doped diphasic mullite gels

Published online by Cambridge University Press:  31 January 2011

Seong-Hyeon Hong ,
Naesung Lee ,
Altaf H. Carim  and
Gary L. Messing
Seong-Hyeon Hong
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
Naesung Lee
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
Altaf H. Carim
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
Gary L. Messing
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
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Abstract

Interfacial precipitation in sol-gel derived, titania-doped diphasic mullite gels was investigated using conventional and high resolution transmission electron microscopy. Rutile, anatase, and brookite precipitated on the interface between {110} planes of mullite and glass pockets in the sintered body. The formation of brookite may be attributable to the Si- and Al-rich environment during precipitation. Each polymorph of titania has a unique morphology and orientation relationship with mullite. Brookite exhibits a truncated pill box shape, and anatase displays a vermicular morphology. Quenching experiments suggest that the precipitates grow and undergo phase transformations during cooling.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 4 , April 1998 , pp. 974 - 978
Copyright
Copyright © Materials Research Society 1998

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