Effects of Heat Treatment Condition on Properties of Strontium Barium Niobate Based Glass-Ceramic for Energy Storage Capacitors
Strontium barium niobate-based glass-ceramics are prepared by melt-casting followed by controlled crystallization. Results show that Ba0.25Sr0.75Nb2O6 with tungsten bronze structure forms as the dielectric phases from the glass matrix at 800°C. However, a secondary phase NaSr1.2Ba0.8Nb5O15 occurrs when crystallization temperature exceeds 850°C. The glass-ceramics formed through controlled crystallization exhibit the excellent stability of the temperature and frequency dependence of dielectric properties. The breakdown strength increases with the crystallization temperature. The glass-ceramic material heated at 800°C/3h+950°C/3h shows a breakdown strength of 1400 kV/cm and its energy storage density can reach up to 4.0 J/cm3, which may be strong candidate for high energy density storage capacitors for portable or pulsed power applications.
G. H. Chen and W. J. Zhang, "Effects of Heat Treatment Condition on Properties of Strontium Barium Niobate Based Glass-Ceramic for Energy Storage Capacitors", Advanced Materials Research, Vols. 311-313, pp. 2071-2074, 2011