Effect of the Ba/Ti Ratio on the Microstructures and Dielectric Properties of Barium Titanate‐Based Glass–Ceramics

Abstract

A series of BaTiO 3 (BT)‐based ferroelectric glass–ceramics have been prepared via controlled crystallization by varying the Ba/Ti ratio in an aluminum silicate glass composition, and the subsequent microstructure, phase evolution, and dielectric properties have been investigated. X‐ray diffraction indicated that an increasing Ba/Ti ratio promoted the crystallization of BaTiO 3 and BaAl 2 Si 2 O 8 from the glass matrix, and the cracking of glass–ceramics appears to be correlated to mismatch in the thermal expansion coefficient among BaTiO 3 , BaAl 2 Si 2 O 8 , and the glass matrix. In addition, it was found that increasing the Ba/Ti ratio facilitated the formation of a dendrite structure with obvious porosity. The change in the Ba/Ti ratio in the glass notably modified the dielectric properties: a high Ba/Ti ratio in the glass resulted in an increased dielectric constant and decreased breakdown strength.