The Effect of Oxygen Vacancies on the Dielectric Responses of BaTiO₃ Based Ceramics in the Ultra-Wide Frequency Range

Abstract:

The effect of oxygen vacancies and their migrations on the dielectric responses of BaTiO₃ (BT) ceramics and (Ba, Ca)(Ti, Zr)O₃ (BCTZ) ceramics was studied using wideband dielectric spectroscopy. Both dipole and ionic polarization of BT ceramics after annealing in a reducing atmosphere markedly decreased. To elucidate the decrease of dipole and ionic polarization, we observed the domain width and the crystal structure of BT ceramics annealed in different PO₂. The mass fractions of constituted phases in 90^o domain were calculated using the refinement of XRD patterns to explain the degradation of ionic polarization by oxygen vacancies. From the results above, we judged that the decrease of dipole polarization was due to the domain wall clamping by oxygen vacancies, while that of ionic polarization was attributable to the lattice hardening by the incorporation of oxygen vacancies into the BT lattice. In the case of BCTZ ceramics, dipole polarization showed the same way as BT ceramics with annealing conditions but the ionic polarization was independent of PO₂ in annealing because of anti-reducing behavior of BCTZ ceramics. On the basis of the effect of oxygen vacancy in BT ceramics and BCTZ ceramics, we could clarify the oxygen vacancy migration in BCTZ ceramics under high direct-current voltage (DCV).

• Periodical: Key Engineering Materials (Volume 485)
• Pages: 15-18
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.485.15
• Online since: July 2011
• Authors: Youn Kyu Choi, Takuya Hoshina, Hiroaki Takeda, Jong Min Oh, Takaaki Tsurumi
• Keywords: Barium Titanate (BT), Dielectric Response, Domain Polarization, GLSL, Gradient Lattice Strain Layer, Ionic Polarization, Oxygen Vacancy, Oxygen Vacancy Migration

References

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

[2] C. H. Park and D. J. Chadi: Physical Review B 57 (1998), p.961.

[3] Y. K. Choi, T. Hoshina, H. Takeda and T. Tsurumi: J. Ceram. Soc. Jpn. 118 (2010), p.881.

[4] Y. Sakabe. N. Wada, T. Hiramatsu and T. Tonogaki: Jpn. J. Appl. Phys. 41 (2002), p.6922.

[5] F. Izumi, H. Asano, H. Murata and N. Watanabe: J. Appl. Crystallogr. 20 (1987), p.411.

[6] Y. K. Choi, T. Hoshina, H. Takeda and T. Tsurumi: submitted to Jpn. J. Appl. Phys (2010).

[7] F. Gervais: Infrared and Millimeter Waves, edited by K. J. Button (Academic, New York, 1983), Vol. 8 p.279.

[8] Y. K. Choi, T. Hoshina, H. Takeda and T. Tsurumi: Appl. Phys. Lett. 97 (2010), p.212907.

[9] T. Hoshina, S. Wada, Y. Kuroiwa and T. Tsurumi: Appl. Phys. Lett. 93 (2008), p.192914.

DOI: 10.1063/1.3027067