Determination of Landau free-energy parameters by dielectric measurements in the ferroelectric TSCC

The authors measured the adiabatic dielectric permittivity epsilon b of tris-sarcosine calcium chloride (TSCC) at 400 Hz near the ferroelectric transition for DC bias fields up to 5000 V cm -1 . They found epsilon infinity =4.2+or-0.2, Curie-Weiss constant C + =38.3+or-0.3K, T 0 =129.4+or-0.1K, and Landau coefficients A=(2.95+or-0.2)*10 9 V m A -1 s -1 K -1 and B=(3.5+or-0.1)*10 15 V m 5 A -3 s -3 . They observed evidence of an internal bias field as reported previously by others.