Fig. 2: Temperature evolution of relaxational absorption band.
From: Dielectric ordering of water molecules arranged in a dipolar lattice
a Temperature dependences of the real part of the dielectric permittivity ε′ of a hydrous cordierite crystal for E || a polarization at different frequencies as indicated. In addition, ε′(T) data for a water-free cordierite crystal (WF, 1.2 kHz) are included. The blue solid line shows the result of a least-square fit with the Curie-Weiss expression, Eq. (1), with C = 390 K and TC = −15 K. b, c Hz–MHz and THz spectra of the real b and imaginary c parts of the dielectric permittivity of the hydrous cordierite crystal measured at different temperatures as indicated. The short-dashed lines represent least-square fits with Eq. (2) of measured spectra shown by full dots. WF denotes the spectra obtained for a water-free crystal (squares). The dotted lines connecting the radiofrequency and terahertz spectra are guides to the eye.
