caa a22 4500 445826533 CHVBK 20180317145300.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10854-010-0195-7 doi (NATIONALLICENCE)springer-10.1007/s10854-010-0195-7 Influence of the concentration of Sb2O3 on the electrical properties of SnO2 varistors [Elektronische Daten] [J. Ciórcero, S. Pianaro, G. Bacci, A. Zara, S. Tebcherani, E. Longo] Varistors are electronic materials with nonohmic behavior. In traditional SnO2 varistors, CoO acts as a densifying agent, Nb2O5 increases the electrical conductivity of SnO2 grains, and Cr2O3 produces a more uniform microstructure and acts as an oxygen retaining agent at the grain boundaries. The present work involved a systematic study of the substitution of Nb2O5 for Sb2O3 in the composition of a ternary varistor system. The compositions were prepared by conventional wet ceramic processing using deionized water, and the resulting slips were dried by spray-drying. Pellets were produced under a pressure of 330MPa and sintered at 1,350°C for 2h. Similar to the behavior of Nb2O5, increasing the concentration of Sb2O3 reduced the nonlinear behavior of the ceramic and its breakdown electric field while increasing its leakage current. The samples' microstructure showed greater porosity, suggesting that higher concentrations of Sb2O3 reduce the sintering rate, probably in response to the higher concentration of tin vacancies in the structure. Springer Science+Business Media, LLC, 2010 Ciórcero J. Department of Materials Engineering, LIMAC—Interdisciplinary Laboratory of Ceramic Materials, UEPG—Ponta Grossa State University, Av. Carlos Cavalcante 4748, 84030-900, Ponta Grossa, PR, Brazil aut Pianaro S. Department of Materials Engineering, LIMAC—Interdisciplinary Laboratory of Ceramic Materials, UEPG—Ponta Grossa State University, Av. Carlos Cavalcante 4748, 84030-900, Ponta Grossa, PR, Brazil aut Bacci G. Department of Materials Engineering, LIMAC—Interdisciplinary Laboratory of Ceramic Materials, UEPG—Ponta Grossa State University, Av. Carlos Cavalcante 4748, 84030-900, Ponta Grossa, PR, Brazil aut Zara A. Department of Materials Engineering, LIMAC—Interdisciplinary Laboratory of Ceramic Materials, UEPG—Ponta Grossa State University, Av. Carlos Cavalcante 4748, 84030-900, Ponta Grossa, PR, Brazil aut Tebcherani S. Department of Chemistry, LIMAC—Interdisciplinary Laboratory of Ceramic Materials, UEPG—Ponta Grossa State University, Av. Carlos Cavalcante 4748, 84030-900, Ponta Grossa, PR, Brazil aut Longo E. Department of Chemistry, INCTMN—Federal University of São Carlos, PO Box 676, 84030-900, São Carlos, SP, Brazil aut Journal of Materials Science: Materials in Electronics Springer US; http://www.springer-ny.com 22/6(2011-06-01), 679-683 0957-4522 22:6<679 2011 22 10854 https://doi.org/10.1007/s10854-010-0195-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10854-010-0195-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ciórcero J. Department of Materials Engineering, LIMAC—Interdisciplinary Laboratory of Ceramic Materials, UEPG—Ponta Grossa State University, Av. Carlos Cavalcante 4748, 84030-900, Ponta Grossa, PR, Brazil aut NATIONALLICENCE 700 1- Pianaro S. Department of Materials Engineering, LIMAC—Interdisciplinary Laboratory of Ceramic Materials, UEPG—Ponta Grossa State University, Av. Carlos Cavalcante 4748, 84030-900, Ponta Grossa, PR, Brazil aut NATIONALLICENCE 700 1- Bacci G. Department of Materials Engineering, LIMAC—Interdisciplinary Laboratory of Ceramic Materials, UEPG—Ponta Grossa State University, Av. Carlos Cavalcante 4748, 84030-900, Ponta Grossa, PR, Brazil aut NATIONALLICENCE 700 1- Zara A. Department of Materials Engineering, LIMAC—Interdisciplinary Laboratory of Ceramic Materials, UEPG—Ponta Grossa State University, Av. Carlos Cavalcante 4748, 84030-900, Ponta Grossa, PR, Brazil aut NATIONALLICENCE 700 1- Tebcherani S. Department of Chemistry, LIMAC—Interdisciplinary Laboratory of Ceramic Materials, UEPG—Ponta Grossa State University, Av. Carlos Cavalcante 4748, 84030-900, Ponta Grossa, PR, Brazil aut NATIONALLICENCE 700 1- Longo E. Department of Chemistry, INCTMN—Federal University of São Carlos, PO Box 676, 84030-900, São Carlos, SP, Brazil aut NATIONALLICENCE 773 0- Journal of Materials Science: Materials in Electronics Springer US; http://www.springer-ny.com 22/6(2011-06-01), 679-683 0957-4522 22:6<679 2011 22 10854 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer