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Improvement in Nonlinear Properties and Electrical Stability of ZnO Varistors with B 2 O 3 Additives by Nano‐Coating Method
Author(s) -
Cheng Lihong,
Li Guorong,
Yuan Kaiyang,
Meng Lei,
Zheng Liaoying
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04900.x
Subject(s) - varistor , materials science , dielectric spectroscopy , desorption , coating , chemical engineering , degradation (telecommunications) , analytical chemistry (journal) , grain size , activation energy , nano , composite material , adsorption , chemistry , electrochemistry , electronic engineering , chromatography , physics , electrode , quantum mechanics , voltage , engineering
The nonlinear properties and electrical stability of ZnO varistors were improved with B 2 O 3 additive using nano‐coating method. The microstructural morphology and nonlinear electrical properties with increasing B 2 O 3 contents were studied using SEM and C – V measurements. The influence of B 2 O 3 on grains and grain boundaries was investigated using impedance spectroscopy. The activation energy was calculated, and the dc stability tests were carried out. The results indicate that the B 2 O 3 increases barrier height, enhances nonlinear characteristic, and decreases degradation rate coefficient. The effect of B 2 O 3 on the nonlinear coefficient is derived from its low melting point. Finally, an explanation of oxygen absorption and desorption mechanism was proposed for the improvement of electrical properties.