Dielectric Breakdown of Polycrystalline BaTiO_3

概要

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The temperature dependence of breakdown field, distribution of time lag. and dielectric constant in high electric field were studied on polycrystalline BaTiO_3. The d. c. breakdown field is nearly constant in the temperature range 20 to 150℃, on the other band the pulse breakdown field changes markedly near the Curie temperature (120℃). The time lag is statistical and depends on the applied field. The "total" dieiectric constant in high fields behaves differently from that in low fields, that is higher in ferroelectric state than in paraelectric state, decreasing remarkably near the Curie temperature. From these facts, it is concluded that the breakdown is of the avalanche type. It is suggested that the pulse breakdown field ralates to the high field dielectric constant and the d. c. breakdown field is affected by the transport of free charge.
社団法人日本物理学会の論文
1964-08-05