Sintering of surfactant modified ZnO–Bi2O3 based varistor nanopowders |
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| Authors: | S Anas R Metz MA Sanoj RV Mangalaraja S Ananthakumar |
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| Affiliation: | 1. Materials and Minerals Division, National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific and Industrial Research (CSIR), Trivandrum 695019, Kerala, India;2. Institut Charles Gerhardt Montpellier, UMR 5253 CNRS, Université Montpellier 2, ENSCM, 8, rue de l’Ecole Normale, 34296 Montpellier Cedex 05, France;3. Laboratoire Matériaux Energétiques et Composés Polyazotés, Lyon1-CNRS-Isochem (groupe SNPE), UMR 5179 CNRS/UCBL/CNES/SNPE, Université Claude Bernard - Lyon 1, Batiment Berthollet, 69622 Villeurbanne Cedex, France;4. Department of Engineering Materials, University of Concepcion, Chile |
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| Abstract: | Surfactant modified nano-origin ZnO–Bi2O3 varistor powder was prepared in presence of cetyltrimethyl ammonium bromide (CTAB) surfactant through an aqueous reflux reaction at 100 °C. The compacted varistor discs made from the nano-origin powders were subjected to step-sintering, microwave sintering and solid-state sintering. The influences of CTAB in different sintering methods were analyzed from the densification characteristics, evolution of sintered microstructures and associated varistor properties (I–V). The conventional solid-state sintering produced 96% theoretical sintered dense samples at 1100 °C. The step and microwave sintered samples showed 93% and 99% sintered densities, respectively, with controlled microstructures having grain sizes in the range of 2–6 μm at the given conditions. The CTAB advantages were clearly seen in grain structuring and grain boundary properties, in addition to the enhanced densification and homogenous microstructures for obtaining high breakdown voltage and non-linearity coefficient. |
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| Keywords: | Sintering Nanocrystalline powder Surfactant Microstructure ZnO varistor |
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