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Resistance degradation behavior of Ca-doped BaTiO3

Published online by Cambridge University Press:  31 January 2011

Seok-Hyun Yoon ,
Sung-Hyung Kang ,
Sang-Hoon Kwon  and
Kang-Heon Hur
Seok-Hyun Yoon*
Affiliation:
LCR R&D Group, LCR Division, Samsung Electro-Mechanics Co. Ltd., Suwon, Gyunggi-Do, 443-743 Korea
Sung-Hyung Kang
Affiliation:
LCR R&D Group, LCR Division, Samsung Electro-Mechanics Co. Ltd., Suwon, Gyunggi-Do, 443-743 Korea
Sang-Hoon Kwon
Affiliation:
LCR R&D Group, LCR Division, Samsung Electro-Mechanics Co. Ltd., Suwon, Gyunggi-Do, 443-743 Korea
Kang-Heon Hur
Affiliation:
LCR R&D Group, LCR Division, Samsung Electro-Mechanics Co. Ltd., Suwon, Gyunggi-Do, 443-743 Korea
*
a)Address all correspondence to this author. e-mail: seokhyun72.yoon@samsung.com, yoonseokhyun@gmail.com
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Abstract

Resistance degradation of Ca-doped BaTiO3 ceramics was investigated. A series of coarse and fine-grained (Ba1–xCax)TiO3 with only Ba site incorporation ranging x from 0 to 0.1, and Ba(Ti1–yCay)O3 ceramics with only Ti site incorporation ranging y from 0 to 0.015, were prepared with similar grain sizes. The increase of x did not cause any distinct difference in degradation, whereas an increase in y caused a significant resistance degradation in both coarse and fine-grained specimens. The variation of ionic transference number (tion) as evaluated by the Warburg impedance was negligible with increase in x, but significantly increased with the increase in y. These results demonstrate that the decrease of lattice parameters and lattice shrinkage by the Ba site incorporation of Ca has little influence on the resistance degradation, and that the oxygen vacancy concentration generated by the Ti site incorporation of acceptor Ca is a very important factor that governs resistance degradation.

Keywords

Dielectric propertiesElectrical propertiesCeramic
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 11 , November 2010 , pp. 2135 - 2142
Copyright
Copyright © Materials Research Society 2010

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