Effect of oxygen partial pressure during firing on the high AC field response of BaTiO3 dielectrics

Ichiro Fujii, Michael Ugorek, Yisong Han, Susan Trolier-Mckinstry

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The effect of oxygen partial pressure during firing on the high field dielectric response of formulated and undoped BaTiO3 ceramics was investigated. For formulated ceramics, the dielectric constant of both oxygen- and air-fired samples increased almost linearly with the amplitude of the ac-driving field. Formulated BaTiO3 samples sintered in a reducing atmosphere produced a sublinear increase in the permittivity with the ac field amplitude. For undoped BaTiO3 ceramics, the dielectric constant increased sublinearly over a wide range of oxygen partial pressures during firing. It is proposed for the formulated ceramics that the dopant-oxygen vacancy defect dipoles in the shell region accounted for the curvature in the field dependence of the permittivity. These defects appear to add a concentration of weak pinning centers to the potential energy profile through which domain walls move.

Original languageEnglish (US)
Pages (from-to)1081-1088
Number of pages8
JournalJournal of the American Ceramic Society
Volume93
Issue number4
DOIs
StatePublished - Apr 1 2010

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partial pressure
Partial pressure
ceramics
Permittivity
Oxygen
oxygen
permittivity
defect
Defects
Domain walls
Oxygen vacancies
Potential energy
potential energy
curvature
Doping (additives)
shell
firing
effect
atmosphere
air

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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abstract = "The effect of oxygen partial pressure during firing on the high field dielectric response of formulated and undoped BaTiO3 ceramics was investigated. For formulated ceramics, the dielectric constant of both oxygen- and air-fired samples increased almost linearly with the amplitude of the ac-driving field. Formulated BaTiO3 samples sintered in a reducing atmosphere produced a sublinear increase in the permittivity with the ac field amplitude. For undoped BaTiO3 ceramics, the dielectric constant increased sublinearly over a wide range of oxygen partial pressures during firing. It is proposed for the formulated ceramics that the dopant-oxygen vacancy defect dipoles in the shell region accounted for the curvature in the field dependence of the permittivity. These defects appear to add a concentration of weak pinning centers to the potential energy profile through which domain walls move.",
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Effect of oxygen partial pressure during firing on the high AC field response of BaTiO3 dielectrics. / Fujii, Ichiro; Ugorek, Michael; Han, Yisong; Trolier-Mckinstry, Susan.

In: Journal of the American Ceramic Society, Vol. 93, No. 4, 01.04.2010, p. 1081-1088.

Research output: Contribution to journalArticle

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