Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1449726 | Acta Materialia | 2007 | 10 Pages |
Abstract
A direct synthesis of varistor-grade doped ZnO powder was attempted by simple hydrolysis followed by low-temperature refluxing (80 °C) in aqueous and alcoholic media. Rod like, one-dimensional nanocrystalline doped ZnO powders with crystallite size 24 nm and Brunauer–Emmett–Teller (BET) bulk surface area 22 m2 g−1 were synthesized. Sintering characteristics of these powders were analyzed under step-sintering coupled with rapid heating up to 1050 °C. The microstructural features and I–V characteristics of the step-sintered doped ZnO were compared with composite varistors. The study shows the advantage of the addition of nanosize doped varistor-grade ZnO as well as step-sintering for controlling grain size and improving varistor performance.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
S. Anas, R.V. Mangalaraja, Mukundan Poothayal, Sanjeev K. Shukla, S. Ananthakumar,