Temperature dependence of low field switching and coercive field in ferroelectric TGS

The temperature dependence of the maximum switching current density j(m) = j(t(m)) has been investigated for ferroelectric triglycine sulfate (TGS) at low fields (1kV/cm<E-2<2kV/cm) under almost linearly rising pulses, being E-m = E(t(m) ) the field value at which the maximum switching current occur s. Increasing temperature above room temperature shows an intermediate zone between the two different switching behaviors already reported, which is i ntimately connected with the presence of a small bias in the sample. We dis cuss the meaning of coercive field in a ferroelectric in connection with th e observed switching behavior.