The influence of sintering process and atmosphere on the non-ohmic properties of SnO2 based varistor

• Published in: Journal of materials science. Materials in electronics Vol. 10; no. 4; p. 321
• Main Authors: Leite, E R, Nascimento, A M, Bueno, P R, Longo, E, Varela, J A
• Format: Journal Article
• Language: English
• Published: New York Springer Nature B.V 01-06-1999
• Subjects: Sintering
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1023/A:1008933004042

The non-ohmic properties of the 98.95% SnO^sub 2^ + 1.0%,CoO + 0.05%,Nb^sub 2^O^sub 5^ (all in mole%) system, as well as the influence of sintering temperature and atmosphere on these properties, were characterized in this study. The maximum non-linear coefficient (α = 32) was obtained for a sintering temperature of 1300°C in an oxygen atmosphere and this maximum is associated with the presence of O in SnO^sub 2^ grain boundaries, as interface defects. Experimental results also indicate thermionic-type conduction mechanisms, which are associated with the potential barrier of Schottky or Poole-Frenkel types.[PUBLICATION ABSTRACT]