Abstract
Pb0.99(Zr0.95Ti0.05)0.98Nb0.02O3 (PZTN 95/5) ferroelectric ceramics were fabricated using low-temperature sintering process with the addition of CuO as sintering aid. The influence of CuO on the microstructure, breakdown strength and energy density of PZTN 95/5 ceramics were investigated. The results of the relative density and the grain size distribution show that, compared with pure PZTN 95/5 ceramics, 0.2 wt% CuO-added PZTN 95/5 ceramics show a higher density and smaller and more uniform grains. More importantly, an improved dielectric breakdown strength by 15.5 % is achieved in 0.2 wt% CuO-added samples, due to the increase of the density and the decrease of the grain size. Then, an enhanced energy density is also obtained. It is suggested that the preparation of PZTN 95/5 ferroelectric ceramics with high density and fine grains by the addition of CuO provides a promising method to improve the reliability and power output density of pulse power supplies.
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