Title :
Effect of Ag Electrode on the Electrical Properties of SrTiO3-Based Ring Varistors
Author :
Li, Jianying ; Li, Shengtao
Author_Institution :
State Key Lab. of Electr. Insulation & Power Equip., Xi´´an Jiaotong Univ.
Abstract :
The effect of two Ag electrodes on the electrical properties of SrTiO3 ring varistors were presented in this paper. It was found that one of them results in ohmic contact while the other results in non-ohmic contact between electrode and ceramics. Compared with the results achieved by using of In-Ga alloy paste, non-ohimic contact lead to larger varistor voltage U10mA, larger nonlinear coefficient alpha and lower dielectric loss tandelta. SEM technique was applied to investigate the interface of Ag electrode/SrTiO3 ceramics. A 30-40 mum wide layer, mainly composed of Zn element, was found between ohmic Ag electrode and ceramics, which is the origin of ohmic contact between electrode and SrTiO3 ceramics
Keywords :
ceramics; dielectric losses; electrodes; ohmic contacts; scanning electron microscopy; silver; strontium compounds; varistors; 30 to 40 micron; Ag electrode; Ag-SrTiO3; In-Ga alloy paste; SEM; Zn element; ceramics; dielectric loss; electrical properties; electrode-ceramic interface; nonlinear coefficient; nonohmic contact; ohmic contact; ring varistors; Atmosphere; Ceramics; Dielectric losses; Electrodes; Grain boundaries; Ohmic contacts; Powders; Strontium; Varistors; Voltage;
Conference_Titel :
Properties and applications of Dielectric Materials, 2006. 8th International Conference on
Conference_Location :
Bali
Print_ISBN :
1-4244-0189-5
Electronic_ISBN :
1-4244-0190-9
DOI :
10.1109/ICPADM.2006.284299
