Electrical and microstructural characteristics of ZnO–Bi2O3-based varistors doped with rare-earth oxides
- 1 October 2001
- journal article
- Published by Springer Science and Business Media LLC in Journal of Materials Research
- Vol. 16 (10), 2817-2823
- https://doi.org/10.1557/jmr.2001.0388
Abstract
ZnO-based varistor samples with a relatively high Sb2O3 to Bi2O3 ratio of 5 were fired at 1200 °C and found to have a high threshold voltage (VT) of 280 V/mm and a low energy-absorption capacity of 50 J/cm3. The introduction of rare-earth oxides (REO) increased the energy-absorption capacity of Pr6O11- and Nd2O3-doped samples to 110 J/cm3 while their threshold voltage (VT) remained slightly above 300 V/mm. Doping with Pr6O11 and Nd2O3 altered the formation of the spinel phase and significantly changed its particle size and distribution which, as a result, had a positive effect on the energy-absorption capacity of the REO-doped samples. Doping with small amounts of Pr6O11 and Nd2O3 appears to be promising for the preparation of ZnO-based varistors with a high breakdown voltage and a high energy absorption capacity.Keywords
This publication has 12 references indexed in Scilit:
- Varistor CeramicsJournal of the American Ceramic Society, 1999
- Effect of chromium on the phase evolution and microstructure of ZnO doped with bismuth and antimonyJournal of Materials Science, 1997
- High-field ZnO-based varistorsJournal of Physics D: Applied Physics, 1995
- Grain Growth of Zinc Oxide During the Sintering of Zinc Oxide—Antimony Oxide CeramicsJournal of the American Ceramic Society, 1991
- Application of Zinc Oxide VaristorsJournal of the American Ceramic Society, 1990
- Microstructure development in Sb2O3-doped ZnOJournal of Materials Science, 1989
- Different ‘‘single grain junctions’’ within a ZnO varistorJournal of Applied Physics, 1987
- Destruction mechanism of ZnO varistors due to high currentsJournal of Applied Physics, 1984
- Formation Mechanism of Nonohmic Zinc Oxide CeramicsJapanese Journal of Applied Physics, 1980
- Effects of Heat-Treatment on Crystal Phases, Microstructure and Electrical Properties of Nonohmic Zinc Oxide CeramicsJapanese Journal of Applied Physics, 1979