Improvement of Insulation Reliability of BaTiO₃-Based Ceramics Using Mixed Conductive Electrode

Abstract:

The insulation degradation of BaTiO₃-based ceramics under direct-current field is caused by the migration of oxygen vacancies. To improve the reliability of BaTiO₃-based ceramic capacitors, conventional approaches are focusing on dielectrics, mainly working on suppressing the total amount of oxygen vacancies towards the cathode. In this study, we newly focus NOT on the dielectrics but on the electrodes, and tried to improve the reliability of BaTiO₃-based ceramics by suppressing the segregation of migrated oxygen vacancies. La_0.8Sr_0.2MnO₃ (LSM) is a mixed ionic-electronic conductor that generates oxide ions from gas-phase oxygen. We expected that LSM would compensate for migrated oxygen vacancies when using it as the cathode of a BaTiO₃-based ceramic capacitor. The results of our highly-accelerated life tests indicate that the reliability of BaTiO₃-based ceramics improved when LSM porous ceramics was used only as the cathode, (NOT the anode).

• Periodical: Key Engineering Materials (Volume 582)
• Pages: 44-47
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.582.44
• Online since: September 2013
• Authors: Daichi Yoshidome, Takuya Hoshina, Hiroaki Takeda, Yukio Sakabe, Takaaki Tsurumi
• Keywords: BaTiO₃-Based Ceramics, Degradation, Insulation Reliability, Mixed Ionic-Electronic Conductive Electrode, MLCCs, Oxygen Vacancy

References

[1] R. Waser, T. Baiatu, and K. H. Härdtl: Mater. Sci. Eng., A 109 (1989), p.171.

[2] R. Waser, T. Baiatu and K. H. Härdtl: J. Am. Ceram. Soc., 73.

[6] (1990), p.1645.

[3] H. Kishi, Y. Mizuno, and H. Chazono: Jpn. J. Appl. Phys., Part 1 42 (2003), p.1.

[4] D.F. K. Hennings: J. Eur. Ceram. Soc. 21 (2001), p.1637.

[5] K. Morita, Y. Mizuno, H. Chazono, and H. Kishi: Jpn. J. Appl. Phys., Part 1 41 (2002), p.6957.

[6] H. Chazono and H. Kishi: J. Appl. Phys., Vol. 40 (2001), p.5624.

[7] R. Waser, T. Baiatu and K. H. Härdtl: J. Am. Ceram. Soc., 73.

[6] (1990), p.1654.

[8] J. Chun and H. I. Yoo: J. Kor. Ceram. Soc. 49 (2012), p.48.

[9] Y. Sakabe: Ph. D. thesis (2002), p.50.

[10] N. Gunasekaran, N. Bakshi, C. B. Alcock, and J. J. Carberry: Solid State Ionics, 83 (1996), p.146.

[11] S. K. Kurtz, S. Levinson, and D. Shi: J. Am. Ceram. Soc., 72.

[12] (1989), p.2223.

[12] J. D. Kim, G. D. Kim, J. W. Moon, Y. I. Park, W. H. Lee, K. Kobayashi, M, Nagai, and C. E. Kim: Solid State Ionics 143 (2001), p.382.

[13] S. P. Jiang: Solid State Ionics, 146 (2002), p.4.