High-performance and low-voltage SnO2-based varistors |
| |
| Affiliation: | 1. Department of Materials Science and Technology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand;2. Synchrotron Light Research Institute, Muang, Nakhon Ratchasima 30000, Thailand;3. Department of Chemistry and 4D LABS, Simon Fraser University, Burnaby, British Columbia, Canada, V5A 1S6;4. School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK;5. School of Ceramic Engineering, Suranaree University of Technology, Muang, Nakhon Ratchasima 30000, Thailand;1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 10081, China;2. National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing 10081, China;3. School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China;4. School of Environmental and Materials Engineering, Yantai University, Yantai 264005,China;1. Pacific Northwest National Laboratory, Richland, WA 99352, USA;2. Laboratory of Inorganic Materials, Joint Workplace of the University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic;3. The Institute of Rock Structure and Mechanics of the ASCR, v.v.i., V Holešovičkách 41, 182 09 Prague 8, Czech Republic;4. US Department of Energy, Office of River Protection, Richland, WA 99352, USA;1. University of Belgrade, Vinča Institute of Nuclear Sciences, Department of Materials Science, PO Box 522, 11001 Belgrade, Serbia;2. University of Belgrade, Faculty of Physical Chemistry, Studentski trg 12-16, 11000 Belgrade, Serbia;3. University of Belgrade, Innovation Centre of Faculty of Chemistry, Faculty of Chemistry, Studentski trg 12-16, 11000 Belgrade, Serbia;4. University of Belgrade, Institute for Multidisciplinary Research, 11000 Belgrade, Serbia |
| |
| Abstract: | This paper presents the results of a thorough study conducted on the action mechanism of one-dimensional single-crystalline SnO2 nanobelts in decreasing the breakdown electric field (Eb) in SnO2-based varistors. The proposed method has general validity in that our investigation was focused on the traditional varistor composition SnO2-CoO-Cr2O3-Nb2O5. To accomplish our study objective, two methods of decreasing Eb value were compared; one involving the increase in average grain size of the varistor through the sintering time and the other one related to the addition of nanobelts. The morphological results show that the method involving the increase in average grain size is limited by the formation of intragranular pores. Furthermore, despite contributing successfully towards decreasing the Eb value (which underwent a decline from 3990 V cm−1 to 1133 V cm−1 with an increase in sintering time from 1 h to 2 h), the reduction obtained by this method is found to be much lower compared to that obtained via the nanobelts insertion method (Eb = 270 V cm−1). Impedance spectroscopy results showed that the insertion of nanobelts caused a decline in the grain boundary resistance while surface potential measurements proved that this decline in resistance is attributed to the absence of potential barriers along the belts which leads to the formation of a lower resistance percolation path in the varistor. |
| |
| Keywords: | B Nanostructure C Electrical properties E Varistor |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
