Synthesis of novel core-shell nanocomposites for fabricating high breakdown voltage ZnO varistors
作者： Lei Meng , Liaoying Zheng , Lihong Cheng , Guorong Li , Lizhu Huang
DOI: 10.1039/C1JM10807G
关键词: Varistor 、 Breakdown voltage 、 Fabrication 、 Grain size 、 Homogeneity (physics) 、 Tetraethyl orthosilicate 、 Materials science 、 Coating 、 Microstructure 、 Composite material
摘要: A novel varistor-composite synthesis for the fabrication of high breakdown voltage ZnO varistors has been successfully developed. It involves coating nanoparticles with SiO2 through hydrolysis tetraethyl orthosilicate (TEOS) and subsequent additives on core SiO2-coated particles, producing a double core-shell structure. The effect amount TEOS used morphology synthesized composites microstructure, as well electrical property sintered samples from are fully studied. Such materials, appropriate added (Si4+/Zn2+ = 0.15 moles) enables superior performance varistors: (VB 1123 V mm−1), excellent nonlinear coefficient (α 42.5) low leakage current (IL 8.5 μA), compared commercial sample single composites. is attributed to smaller grain size perfect additive homogeneity. SiO2-coating provides better way control varistor microstructure formation nearly circular distribution blocky Zn2SiO4 around grains.
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