Variation of Weibull Modulus as the Scattering Parameter for Dielectric Strength of Barium Titanate Thick Films

Abstract

The variation of the Weibull modulus (m) of dielectric strength (E_b) with temperature showed that E_b scatters more widely in the ferroelectric phase than in the paraelectric phase or around the Curie point (T_c). This result was correlated to the fact that the variation of E_b was approximately inverse to that of dielectric constant. It was also found that the modules m varied with sintering conditions; a higher value of m (ca. 10-15) was obtained in a specimen sintered at a lower temperature for a shorter time. This result is probably correlated with the distribution of larger grains.