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Grain Boundary Segregation in Titanium Dioxide: Evaluation of Relative Driving Forces for Segregation

Published online by Cambridge University Press:  11 February 2011

Qinglei Wang ,
Guoda D. Lian  and
Elizabeth C. Dickey
Qinglei Wang
Affiliation:
Department of Materials Science and Engineering and the Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, U.S.A.
Guoda D. Lian
Affiliation:
Department of Materials Science and Engineering and the Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, U.S.A.
Elizabeth C. Dickey*
Affiliation:
Department of Materials Science and Engineering and the Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, U.S.A.
*
*ecd10@psu.edu
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Abstract

Solute segregation to grain boundaries is a fundamental phenomenon in polycrystalline metal-oxide electroceramics that has enormous implications for the macroscopic dielectric behavior of the materials. This paper presents a systematic study of solute segregation in a model dielectric, titanium dioxide. We investigate the relative role of the electrostatic versus strain energy driving forces for segregation by studying yttrium-doped specimens. Through analytical transmission electron microscopy studies, we quantitatively determine the segregation behavior of the material. The measured Gibbsian interfacial excesses are compared to thermodynamic predictions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 751: Symposium Z – Structure-Property Relationships of Oxide Surfaces and Interfaces II , 2002 , Z4.6
Copyright
Copyright © Materials Research Society 2003

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