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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
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.
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- Copyright © Materials Research Society 2003
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