Microstructural and electrical properties of multicomponent varistor ceramics with PbO–ZnO–B2O3 glass addition |
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Authors: | J Honkamo J Hannu H Jantunen M Moilanen W Mielcarek |
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Affiliation: | (1) Microelectronics and Material Physics Laboratories and EMPART Research Group of Infotech Oulu, University of Oulu, P.O. Box 4500, 90014 Oulu, Finland;(2) Optoelectronics and Measurement Techniques Laboratory and EMPART Research Group of Infotech Oulu, P.O. Box 4500, 90014 Oulu, Finland;(3) Electrotechnical Institute, M. Sklodowskiej-Curie 55/61, 50-369 Wroclaw, Poland |
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Abstract: | Zinc oxide based ceramics are widely used materials in varistors because of their excellent nonlinearity. Traditionally these
ceramics are sintered at high temperatures (about 1,100–1,300°C). In this work a novel zinc oxide-based material with a low
sintering temperature (900–1,000°C) was investigated. This material can be used in varistors consisting of several ceramic
layers with embedded silver/palladium thick-film electrodes. This paper explains the research procedure employed with this
novel varistor material, including the effect of sintering aid addition on the final electrical properties and fired microstructure.
The electrical properties achieved are compared to the values measured from the original zinc oxide composition without sintering
aid addition. Especially the I–V characteristics, nonlinearity coefficient α, breakdown voltage V
bk and leakage current density J
L
are investigated. The sintering properties are also reported. It was found that by adding 10 wt.% of glass and using a 900
°C sintering temperature, the material had good varistor characteristics, as V
bk = 378 V/mm, α = 33 and J
L
= 15 μA/cm2. The investigated varistor material can be applied to protect electrical circuits against surges. |
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Keywords: | Varistor ZnO LTCC |
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