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Thick film ZnO based varistors prepared by screen printing

2006; Elsevier BV; Volume: 26; Issue: 14 Linguagem: Inglês

10.1016/j.jeurceramsoc.2006.02.016

1873-619X

Miguel Angel de la Rubia López, M. Peiteado, J.F. Fernández, A. C. Caballero, Janez Holc, Silvo Drnovšek, Danjela Kuščer, S. Maček, M. Kosec,

Electronic and Structural Properties of Oxides

Abstract Thick film varistors based on the system ZnO–Bi 2 O 3 –Sb 2 O 3 have been prepared by screen printing technology on dense alumina substrates. Different processing strategies have been designed in order to control the excessive volatilization of Bi 2 O 3 in varistor films during the sintering, due to the high area–volume ratio, and as a means to improving their electrical response. Starting powders were selected and pre-treated in different ways to obtain different phases and control the Bi-rich liquid phase formation. Significant differences have been observed in the electrical properties which are related to the selection of the starting powders.