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

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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.