| Journal: | Superficies y vacío |
| Database: | PERIÓDICA |
| System number: | 000343789 |
| ISSN: | 1665-3521 |
| Authors: | Glot, A.B1 Lu, Z.Y2 Zhou, Z.Y2 Ivon, A.I3 |
| Institutions: | 1Universidad Tecnológica de la Mixteca, Huajuapan de León, Oaxaca. México 2South China University of Technology, Guangzhou, Guangdong. China 3Dniepropetrovsk National University, Dniepropetrovsk. Ucrania |
| Year: | 2011 |
| Season: | Jun |
| Volumen: | 24 |
| Number: | 2 |
| Pages: | 61-67 |
| Country: | México |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, aplicado |
| English abstract | Electrical properties of new dense SnO2-CoO-Nb2O5-Cr2O3-Y2O3 varistor ceramics are studied. Current-voltage characteristics in the wide range from 10-11 to about 3.3·103 A·cm-2 contain three regions. At low currents linear (Ohmic) region is found. Highly nonlinear region with the nonlinearity coefficient of about 50 at 1 mA·cm-2 is observed between 10-6 and 1 A·cm-2. At higher currents the upturn region is revealed. In this region the slope of current-voltage characteristic in the double logarithmic scale is decreased. The increase in dc current on time at fixed voltage and the hysteresis in the ac current-voltage characteristic are observed. These features can be related to Joule heating or electronic processes. However, after the high-current pulses only minor changes at low current are found. This indicates that studied ceramics withstand high-current overloads. This fact can be attributed to the formation of quite identical electrically-active grain boundaries throughout a sample. The grain resistivities estimated from high-current pulse data are the lowest known up to now for SnO2 varistors |
| Disciplines: | Ingeniería |
| Keyword: | Ingeniería de materiales, Cerámica, Varistores, Fronteras de grano, Estabilidad de pulsos, Propiedades eléctricas |
| Keyword: | Engineering, Materials engineering, Ceramics, Varistors, Pulse stability, Grain boundaries, Electrical properties |
| Full text: | Texto completo (Ver HTML) |
