Generation and Dynamic Behaviors of Oxygen Vacancies   in Barium Strontium Titanate Ceramics

Fukami, Tatsuki; Agawa, Daisuke; Bamba, Noriko

doi:10.1143/jjap.40.5634

Cited by 11 publications

(8 citation statements)

References 7 publications

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“…It may be supported by the fact that the higher Ni content, the thicker the brown color of air-sintered ͑Ba 0.6 Sr 0.4 ͒TiO 3 is. 22 Obviously, more systematic study is required for clear understanding of the origin of the anodic brown color in BaTiO 3 .…”

Section: Optical Absorption and Color Centersmentioning

confidence: 99%

Electrocoloration and oxygen vacancy mobility of BaTiO3

Yoo

Chang

et al. 2007

Journal of Applied Physics

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The electrical-insulation degradation of BaTiO3 is now of growing interest as the BaTiO3-based dielectric layers of multilayer ceramic capacitors are getting thinner to submicron thicknesses. The degradation is understood to be due to the electrotransport of oxygen vacancies and may be monitored by the colors emanating from the cathode and/or anode. In the case of single crystal BaTiO3, a brown color emanates from the anode and a blue color from the cathode. We will experimentally review the generation of the colors in BaTiO3 in electric fields, and discuss their origins and kinetics of color front migration. From the latter the oxygen vacancy mobility against temperature in the range of 150–500°C is subsequently determined and compared with all the literature data that have normally been estimated by other means at elevated temperatures.

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Section: Optical Absorption and Color Centersmentioning

confidence: 99%

Electrocoloration and oxygen vacancy mobility of BaTiO3

Yoo

Chang

et al. 2007

Journal of Applied Physics

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“…However, their relationship has not yet been elucidated. Thermally stimulated current (TSC) measurement is considered to be one of the most effective methods for investigating the electromigration of oxygen vacancies [5,6]. Although the TSC method makes it possible to determine the existence of electric charges, such as oriented electric dipoles and migrated ions, and trapped carriers in materials, it is difficult to apply this method directly to ferroelectrics because of the strong interaction between these charges and spontaneous polarization.…”

Section: Introductionmentioning

confidence: 99%

Thermally Stimulated Current (TSC) Studies on Resistance Degradation of Ni-MLCC

et al. 2007

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To avoid the influence of spontaneous polarization, thermally stimulated current (TSC) measurements of BaTiO 3 -based multilayer ceramic capacitors with Ni internal electrodes were performed within the paraelectric phase. We observed two TSC peaks and inferred that one of them was related to the resistance degradation according to the electromigration of oxygen vacancies. Further, we proposed that the two peaks resulted from the relaxation phenomenon of the oxygen vacancies, which migrated under dc electrical field stresses, in the grains and over the grain boundaries.

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“…8,9 II. Typically, in this technique the sample is polarized by a static electric field at a relatively high temperature.…”

Section: Introductionmentioning

confidence: 99%