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http://dx.doi.org/10.4191/KCERS.2005.42.5.308

Electrical Conductivity Revisited in Excess BaO into BaTiO3  

Yeo, Hong-Goo (Department of Ceramics Engineering, Changwon National University)
Kuk, Min-Ho (Department of Ceramics Engineering, Changwon National University)
Kim, Myong-Ho (Department of Ceramics Engineering, Changwon National University)
Song, Tae-Kwon (Department of Ceramics Engineering, Changwon National University)
Bae, Dong-Sik (Department of Ceramics Engineering, Changwon National University)
Park, Tne-Gone (Department of Electrical Engineering, Changwon National University)
Lee, Soon-Il (Center for Dielectric Studies, Materials Research Institute, The Pennsylvania State University)
Randall, Clive A. (Center for Dielectric Studies, Materials Research Institute, The Pennsylvania State University)
Publication Information
Journal of the Korean Ceramic Society / v.42, no.5, 2005 , pp. 308-313 More about this Journal
Abstract
In this study the electrical conductivity of excess BaO in $BaTiO_3$ was measured to investigate the relationship between defects and solubility in the temperature range of $900^{\circ}C$ to $1300^{\circ}C$ under various oxygen partial pressure. First of all, quenched $BaTiO_3$ powders of various Ba/Ti ratios were analysed by X-ray diffraction to confirm whether second phase is formed or not. As the results, we observed the solubility of BaO in the temperature range of $1200^{\circ}C$ to $1400^{\circ}C$, and it was also found that the conductivity minima move to lower $PO_2$ with increasing excess BaO within solubility limit.
Keywords
Conductivity; Solid solution; Ba/Ti ratio;
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