Increase in Dielectric Constant during Switching in Barium Titanate and Triglycine Sulfate

Abstract

The increase in dielectric constant and losses during switching was measured in barium titanate and triglycine sulfate (TGS) at frequencies up to 2 Gc. These measurements revealed the presence of two relaxations, one at low frequencies (described by Landauer, Young, and Drougard) and a new one at higher frequencies. The relaxation frequency of this new relaxation is 100 Mc in the case of triglycine sulfate and higher than 2 Gc in the case of BaTiO₃. The value of Δε′ at the relaxation frequency is 2 for triglycine sulfate and 1.2 for BaTiO₃. A model which explains the experimental facts is given. The increase in dielectric constant and losses is attributed to oscillations of the ``side'' walls of the ferroelectric domains in the case of the high frequency relaxation. The low‐frequency relaxation is believed to be due to oscillations of ``front'' walls of the newly formed domains.