Study of PbO-SrO-TiO _2-B _2O _3 glass and glass ceramics

摘要

The glasses with composition (50-X)PbO-XSrO-25TiO _2-25B _2O _3 (where X=0, 5, 10 and 15 mol%) were prepared using conventional quenching technique. The T _g, T _c, density and CTE of the glass samples were measured. The T _g observed to increase with increasing concentration of SrO, while the T _c first decreased and then increased. The glass samples were converted to glass ceramics by following two stage heat treatment schedule. The glass ceramic samples were characterized by XRD, SEM and dielectric measurements. The XRD results revealed the formation of ferroelectric lead titanate as a major crystalline phase in glass ceramics. Additional phases observed include Sr _2B _2O _5 and PbB _2O _4. The room temperature (RT) dielectric constant of glass and glass ceramics are in the range of 100-120 which is promising for capacitor application.