Effects of Ba₆Ti₁₇O₄₀ on the Dielectric Properties of Nb-doped BaTiO₃ Ceramics

Author

X. Xu
Greg Hilmas, Missouri University of Science and TechnologyFollow

Abstract

The dielectric properties, including the DC breakdown strength, of 1 mol% Nb⁵⁺-doped BaTiO₃ ceramics with different quantities of excess TiO₂ have been investigated. The breakdown strength was found to decrease with increasing TiO₂ content, but could not be readily explained by relative density and grain size effects. The decrease in the breakdown strength from a stoichiometric BaTiO₃ composition to samples with excess TiO₂ is believed to be due to the field enhancement effect (up to a factor of 1.40) at the BaTiO₃ matrix because of the presence of a Ba₆Ti₁₇O₄₀ second phase. The thermal expansion coefficient mismatch between the BaTiO₃ matrix phase and the Ba₆Ti₁₇O₄₀ phase may also result in a low breakdown strength. The dielectric properties of the pure Ba₆Ti₁₇O₄₀ phase were also investigated and are reported herein.

Recommended Citation

X. Xu and G. Hilmas, "Effects of Ba₆Ti₁₇O₄₀ on the Dielectric Properties of Nb-doped BaTiO₃ Ceramics," Journal of the American Ceramic Society, vol. 89, no. 8, pp. 2496 - 2501, John Wiley & Sons Inc., Aug 2006.

The definitive version is available at https://doi.org/10.1111/j.1551-2916.2006.01075.x

Department(s)

Materials Science and Engineering

Keywords and Phrases

Breakdown Strength; Dielectric Properties; Grain Size Effects; Stoichiometric

International Standard Serial Number (ISSN)

0002-7820; 1551-2916

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2006 American Ceramic Society, All rights reserved.

Publication Date

15 Aug 2006