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標題: | 氧化鋅積層變阻器的微結構與電性間之關係研究 Relationships between Microstructure and Electrical Properties of ZnO-based Multilayer Varistor |
作者: | Wen-Hsuan Pan 潘玟璇 |
指導教授: | 段維新 |
關鍵字: | 氧化鋅,積層變阻器,銀鈀,電極,晶粒尺寸,晶粒分佈,微結構,電性,崩潰電壓,非線性係數, ZnO,Multilayer varistor,AgPd,Electrode,Grain Size,Size Distribution,Microstructure,Electrical properties,Breakdown Voltage,Nonlinear Coefficient, |
出版年 : | 2008 |
學位: | 碩士 |
摘要: | The performances of ceramics depend strongly on their microstructures. Recently, ZnO-based multilayer varistors (MLVs) have become available. In the present study, AgPd inner electrodes are used in the multilayered ZnO-based varistors. The microstructure of ZnO-based MLV is affected by sintering temperature, dwell time, layer thickness, additives and so on. The relationships between microstructures and electrical properties of the ZnO-based multilayer varistors are therefore investigated.
The results indicate that the breakdown voltage (VB) and nonlinear coefficient (α) are directly controlled by the layer thickness after sintering at 1000°C for 60 min. Although the average size of ZnO grains within MLVs increases with the increasing sintering temperature and time, the effects of secondary phases and discontinuity of AgPd electrodes also affect the electrical properties profoundly. A pyrochlore phase is formed due to the interaction between Bi-rich liquid and spinel phase during heating and cooling stages. The Bi2O3–rich liquid phase can penetrate into the inner electrode and reacts with AgPd to form PdBi2O4. Discontinuity of AgPd electrodes induces the increase of the breakdown voltage and decrease of nonlinear properties. The optimum microstructure and nonlinear ohmic characteristic of the ZnO-based MLV with layer thickness of 10 μm can be obtained by sintering at 1000°C for 60 min. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37381 |
全文授權: | 有償授權 |
顯示於系所單位: | 材料科學與工程學系 |
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