Calculation of thermally stimulated depolarization current from isothermal dielectric response data

Thermally stimulated depolarization is modeled from dielectric response functions deduced from isothermal measurements. The key assumption made is that the same state of polarization can be achieved both via the real non-isothermal thermally stimulated depolarization (TSD) process and via an equivalent isothermal process. The change of polarization with temperature and time is traced through a continuous adjustment of the starting and stopping times and polarizing field of the fictitious isothermal process. The theory is applicable to general cases of non-Debye relaxation with variable activation energy. A comparison of the modeled and measured TSD thermograms is presented for films.