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.

fYear

2006

fDate

38869

Firstpage

801

Lastpage

804

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 U_10mA, 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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICPADM.2006.284299

Filename

4062788