open access

https://hdl.handle.net/2115/57391

Leakage Current Properties of Cation-Substituted BiFeO3Ceramics

英語

co-doping

2010-09

Japan Society of Applied Physics

Japanese Journal of Applied Physics

49(9)

09MB01-1-09MB01-6

Cation-doped BiFeO3 ceramics were fabricated by sintering coprecipitated and calcined powders at 700–900 C to study the effect of cation doping on the leakage current properties of the sintered samples. Among the dopants examined in this study, Ti4þ, Sn4þ, or Zr4þ doping was found to effectively reduce the leakage current of the samples. In particular, a marked decrease in the leakage current density was achieved at 10% Ti4þ doping, which also resulted in the structure change from rhombohedral to cubic. The codoping of Ti4þ/Zn2þ ions or Ti4þ/Ni2þ ions brought about a substantial reduction in the leakage current density of the bulk samples by about four or five orders of magnitude at a small doping amount of 2%. This can be explained by the combined effect of Ti4þ doping, which basically contributes to the decreased number of oxygen vacancies in the sample, and Zn2þ or Ni2þ doping, which might assist the homogeneous substitution of Ti4þ ions for the Fe3þ sites.

学術雑誌論文

Submitted Manuscript Under Review

0021-4922

1347-4065