Mechanism of the typical relaxation process at low frequency based on dielectric measurements of water absorbed in porous titanium dioxide
1 Guizhou University - Huaxi Street, Guiyang 550025, China
2 Institute of Physics, Chinese Academy of Sciences - Beijing 100190, China
Received: 19 January 2016
Accepted: 29 February 2016
Dielectric spectroscopy is a valuable tool in physics, chemistry, biophysics, and materials science. However, there is still an argument about the typical relaxation process at low frequency, which is always masked by electrode polarization. Low-frequency dielectric measurements of water absorbed in porous titanium dioxide have been performed. The experimental results show that typical polarization at low frequency is caused by space-charge polarization. A model is proposed to explain the experimental results, which indicates that the electric field in the sample is close to 0. An effective circuit is given, and the calculation gives similar dielectric spectra to those measured in experiments, which confirms the physical model.
PACS: 77.22.Ch – Permittivity (dielectric function) / 77.22.Gm – Dielectric loss and relaxation / 66.30.Pa – Diffusion in nanoscale solids
© EPLA, 2016