Voltage Switch of Nano-Size Zinc Oxide Ceramic Defected Barium
Two samples of ZnO doped Ba with the chemical composition, 97ZnO-3BaO, have been prepared via oxalate co-precipitation. During precipitation the first sample, A, was stirred by magnetic stirrer while the second sample, B, was stirred via 40KHz ultrasonic wave. The obtained powders were decomposed at 400°C for 3h, then pressed and sintered at 1200°C for 1.5h. Then XRD, SEM and J-E measurements were performed and analysed. The grain sizes of the obtained ceramics were (0.5-2.26) µm and (80-119) nm for samples A and B, respectively. The J-E measurements revealed that the obtained ceramic has voltage switching characteristics, and that the switching voltage could be controlled by the stirring process.
David J. Fisher
M. El-Hofy and A.H. Salama, "Voltage Switch of Nano-Size Zinc Oxide Ceramic Defected Barium", Defect and Diffusion Forum, Vol. 307, pp. 21-26, 2010