Local flux on breakdown of ferroelectric relaxor ceramics

摘要

The effect of local fluxed spots on the breakdown process of ferroelectric relaxor ceramics is investigated. The conducting local fluxed passage-channel can result from lower melting fluxing agents at higher local temperature resulting from accumulating heat under high electric field. The authors present the breakdown mechanism, the local fluxed channel morphology, the dielectric failure with brittle fracture, and the strengthening dielectric breakdown by dispersed ZrO/sub 2/-Al/sub 2/O/sub 3/ particles of the low sintering ferroelectric relaxors. The dispersed ZrO/sub 2/-Al/sub 2/O/sub 3/ superfine particle addition is a good way to improve both dielectric breakdown and fractural strength.