Raman spectroscopy evaluation of oxygen vacancy migration by electrical field in multilayer ceramic capacitors

Ken Nishida, Hiroshi Kishi, Minoru Osada, Hiroshi Funakubo, Masamichi Nishide, Hironari Takeuchi, Takashi Katoda, Takashi Yamamoto

研究成果: Article査読

9 被引用数 (Scopus)

抄録

Raman spectroscopy is used to evaluate migration behavior of oxygen vacancies in BaTiO3-based multilayer ceramic capacitors with Ni internal electrodes (Ni-MLCCs) before and after a highly accelerated life test (HALT). The B1 phonon mode of BaTiO3 that is associated with oxygen vibration was hardened and broadened near the Ni electrodes before HALT. However, the hardening and broadening of the B1 mode were observed near the cathodes after HALT. It is considered that the oxygen vacancies were localized near the Ni electrodes before HALT and they electromigrated toward the cathode because they have the positive charges. These results show that oxygen vacancies migrated and accumulated near the cathode under a dc bias and caused insulation resistance degradation in MLCCs. In addition, Raman spectroscopy is a powerful tool for investigation of structural defect distribution including oxygen vacancies with a relatively high spatial resolution.

本文言語English
ジャーナルJapanese Journal of Applied Physics
48
9 Part 2
DOI
出版ステータスPublished - 2009
外部発表はい

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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