Sinterable ferroelectric glass-ceramics containing (Sr, Ba)Nb2O6 crystals

The densification, crystallization, and dielectric/ferroelectric properties of a SrO–BaO–Nb2O5–SiO2 glass-ceramic were investigated. Glass-ceramics containing (Sr, Ba)Nb2O6 tungsten bronze as the major crystalline phase can be sintered below 1000 °C. The good sinterability is attributed to that the major crystallization process occurred after the sintering of the glass powder compact. The variations of dielectric properties with sintering temperature and test frequency can be explained qualitatively by the amount of SBN phase formed. The maximum dielectric constant at 1 kHz is about 351 for the glass-ceramic sintered at 1000 °C. The existence of ferroelectricity is verified for the present glass-ceramic. The values of the remanent polarization and the coercive field are about 0.15 μC/cm2 and 4.5 kV/cm, respectively, for the glass-ceramic sintered at 1000 °C.