Abstract
Glass-ceramics in the BaO-Na2O-Nb2O5-SiO2 system were fabricated by a controlled-crystallization process. During the process, different heat treatment conditions were applied. Phase formation, micro-structural arrangement, and dielectric properties of the glass-ceramics were investigated by XRD, SEM, and Dielectric spectroscopy techniques. The results of phase identification revealed that NaNbO3 (NN) with perovskite crystals formed at a treatment temperature close to the crystallization peak (Tcr) which was suggested by DTA study of the parent glass. At a higher treatment temperature, Ba3Nb6Si4O26 (BNS) with layered structure was found as the additional crystalline phase. Both crystalline phases distributed randomly throughout the whole bulk glass-ceramic specimens with no observation of phase clustering. The plots of dielectric constant versus temperature revealed the dielectric response of the ferroelectric NaNbO3 crystals. With the presence of Ba3Nb6Si4O26 phase, there was no pronounced effect on the phase transition of the NaNbO3 but it enhanced the dielectric constant at Tmax. The dielectric spectroscopic investigation revealed that dipolar polarization is responsible for overall dielectric contribution.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
