Domain texture and dielectric constant variations observed along ferroelectric loops of a pure triglycine sulphate crystal

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Abstract
The modification of domain texture in triglycine sulphate (TGS) is observed during different ferroelectric loops. Nucleation and domain wall motions are easily observed and they generally involve a small number of domains except at high frequencies. The dielectric constant shows important variations along the loop from ε = 28 to ε = 55 at room temperature and at low frequency (0.005 Hz). The smallest value corresponds to one single domain and a high dc field (2.8 MV/m), the highest one to a polydomain crystal. At higher frequencies the number of domains and the maximum of the dielectric constant are much higher (i.e. ε = 260 at 1600 Hz).