Title :
SrTiO3 capacitor-varistor ceramics exhibiting surface effect
Author :
Jianying, Li ; Shengtao, Li ; Fuyi, Liu ; Yan, Zhuang
Author_Institution :
State Key Lab. of Electr. Insulation for Power Equipment, Xi´´an Jiaotong Univ., China
Abstract :
The electrical properties and microstructure of SrTiO3 capacitor-varistor ceramics sintered in different atmospheres are investigated. The results show that samples sintered in a strong reducing atmosphere of 25%N2+75%H2 and heat-treated in air have a low-resistive core with a high-resistive surface layer around it, which we name the surface effect. XPS results reveal that the surface effect results from an oxygen diffusion process during heat treatment
Keywords :
X-ray photoelectron spectra; ceramics; heat treatment; reduction (chemical); scanning electron microscopy; self-diffusion; semiconductor materials; sintering; strontium compounds; surface conductivity; N2-H2; O diffusion process; SEM; SrTiO3; SrTiO3 capacitor-varistor ceramics; XPS results; electrical properties; heat treatment; high-resistive surface layer; low-resistive core; microstructure; sintering atmosphere; strong reducing atmosphere; surface effect; Atmosphere; Atmospheric measurements; Ceramics; Grain size; Lattices; Semiconductivity; Surface cracks; Temperature; Varistors; Voltage;
Conference_Titel :
Properties and Applications of Dielectric Materials, 2000. Proceedings of the 6th International Conference on
Conference_Location :
Xi´an
Print_ISBN :
0-7803-5459-1
DOI :
10.1109/ICPADM.2000.876393
