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Electrical partial discharge measurement has been investigated as a nondestructive test method to evaluate the mechanical reliability of piezoelectric ceramics. In order to understand the factors affecting partial discharge in piezoelectric ceramics, the effect of electric loading conditions is investigated. In this work, electrical partial discharge tests have been carried out on piezoelectric bulk...
Surface flashover across the insulators in vacuum is the major limitation of the performance of the high power system. Surface characteristics of Insulator effect its surface flashover performance obviously, appropriate surface treatment can increase the surface flashover voltage. Ion implantation technology is an effective surface modification tool, it can change the roughness, resistivity and adsorbability...
In this article La and Nb co-substitution effect on the crystal structure, microstructure, ferroelectric and dielectric properties of 0.96[{Bi0.5 (Na0.84 K0.16)0.5}1−xLax(Ti1−y Nby)O3]-0.04SrTiO3 (BNKLTN-ST, where (x=y) = 0.00 − 0.020) ceramics has been investigated. The ceramics with x,y ≤ 0.010 have pure perovskite structure, while a secondary phase appears in the sample with x=y = 0.020. X-ray...
The influence of annealing after sintering on the non-ohmic and dielectric behavior of CaCu3Ti4O12 ceramics was investigated from −140 to 200 °C. Sintering at 1080 °C was followed by a cooling rate of 2.5 °C/min and quenching to ambient temperature for comparison. And both ceramic samples were annealed in flowing O2, then N2 and O2 again at 950 °C. It was found that annealing in O2 can reduce dielectric...
In this work, CaCu3Ti4O12 ceramics were synthesized to investigate the influence of dc degradation on the dielectric response. Two dielectric relaxation processes related to grain and domain boundaries appearing at low temperature were fitted according to Debye theory. It was found that the dc conductance loss at low frequency was greatly increased after dc degradation. The relaxation behaviors of...
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