種々の電極形状を持Sr, Nb添加PZTセラミックスの絶縁破壊挙動

概要

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Dielectric strength (E_<bd>) and breakdown behavior were evaluated for Sr-, Nb-doped lead zirconate titanate (PZT) ceramics under both d.c. and a.c. electric fields. Three types of specimens were prepared, i.e., a concave disc (CSD), partially electroded disc (PED) and wholly electroded disc (WED). The E_<bd> values measured under the d.c. field were 17.8kV/mm, 8.6kV/mm and 6.9kV/mm for the CSD, PED and WED, respectively. Breakdown was triggered by crack generation in the CSD and PED. Surface flashover occurred in the WED. No significant dependence of E_<bd> on temperature was observed at temperatures below 150℃ under the d.c. field. The E_<bd> values measured under the a.c. field were 5.2kV/mm, 3.9kV/mm and 4.7kV/mm for the CSD, PED and WED, respectively. Thermal breakdown occurred for all specimens prior to breakdown due to crack generation or surface flashover. E_<bd> increased slightly as the frequency of the applied a.c. field decreased. The E_<bd> values measured under the d.c. field were slightly higher than those of BaTiO_3 and almost the same as those of BaTiO_3-SrTiO_3. The E_<bd> values measured under the a.c. field were slightly lower than those of BaTiO_3.
社団法人日本セラミックス協会の論文
1997-04-01