Stability of ZnO-Pr6o11-Cr2O3 varistor ceramics against electrical degradation
The vulnerability of varistor ceramics to electrical degradation during operation not only affects their nonlinear properties but also leads to shortening of device’s lifetime by increasing the risk of failures including melting, fire or even explosions. In this study, ZnO-Pr6O11-Cr2O3 varistor cera...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Trans Tech Publications
2016
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| Online Access: | http://psasir.upm.edu.my/id/eprint/35673/ http://psasir.upm.edu.my/id/eprint/35673/1/Stability%20of%20ZnO-Pr6o11-Cr2O3%20varistor%20ceramics%20against%20electrical%20degradation.pdf |
| _version_ | 1848848120156258304 |
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| author | Wan Abdullah, Wan Rafizah Zakaria, Azmi Hashim, Mansor Rahman, Md. Mahmudur Mohd Ghazali, Mohd Sabri |
| author_facet | Wan Abdullah, Wan Rafizah Zakaria, Azmi Hashim, Mansor Rahman, Md. Mahmudur Mohd Ghazali, Mohd Sabri |
| author_sort | Wan Abdullah, Wan Rafizah |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The vulnerability of varistor ceramics to electrical degradation during operation not only affects their nonlinear properties but also leads to shortening of device’s lifetime by increasing the risk of failures including melting, fire or even explosions. In this study, ZnO-Pr6O11-Cr2O3 varistor ceramics were prepared through modified citrate gel method and solid state-sintering at 1250 °C for 1 hour. The stability of their nonlinear properties under prolonged application of DC electrical field in high temperature ambient was investigated. Degradation process was accelerated by applying direct current (DC) electrical field of 15 % below the breakdown field point of ceramics for 54 hours consecutively at temperature of 30 to 125 °C. The findings indicate that ZnO-Pr6O11-Cr2O3 ceramics exhibited its susceptibility to electrical degradation after prolonged electrical and thermal stresses application. Its nonlinear coefficient has reduced by 4.4 % reduction, the breakdown field has reduced by 9.9 % and the leakage current density increased by 13.7 % in comparison to its initial value. Degradation process in varistor ceramics of ZnO-Pr6O11-Cr2O3 was a direct response to collapsed Double Schottky Barrier at ZnO grain boundary. |
| first_indexed | 2025-11-15T09:29:27Z |
| format | Article |
| id | upm-35673 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T09:29:27Z |
| publishDate | 2016 |
| publisher | Trans Tech Publications |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-356732017-11-10T04:55:22Z http://psasir.upm.edu.my/id/eprint/35673/ Stability of ZnO-Pr6o11-Cr2O3 varistor ceramics against electrical degradation Wan Abdullah, Wan Rafizah Zakaria, Azmi Hashim, Mansor Rahman, Md. Mahmudur Mohd Ghazali, Mohd Sabri The vulnerability of varistor ceramics to electrical degradation during operation not only affects their nonlinear properties but also leads to shortening of device’s lifetime by increasing the risk of failures including melting, fire or even explosions. In this study, ZnO-Pr6O11-Cr2O3 varistor ceramics were prepared through modified citrate gel method and solid state-sintering at 1250 °C for 1 hour. The stability of their nonlinear properties under prolonged application of DC electrical field in high temperature ambient was investigated. Degradation process was accelerated by applying direct current (DC) electrical field of 15 % below the breakdown field point of ceramics for 54 hours consecutively at temperature of 30 to 125 °C. The findings indicate that ZnO-Pr6O11-Cr2O3 ceramics exhibited its susceptibility to electrical degradation after prolonged electrical and thermal stresses application. Its nonlinear coefficient has reduced by 4.4 % reduction, the breakdown field has reduced by 9.9 % and the leakage current density increased by 13.7 % in comparison to its initial value. Degradation process in varistor ceramics of ZnO-Pr6O11-Cr2O3 was a direct response to collapsed Double Schottky Barrier at ZnO grain boundary. Trans Tech Publications 2016 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/35673/1/Stability%20of%20ZnO-Pr6o11-Cr2O3%20varistor%20ceramics%20against%20electrical%20degradation.pdf Wan Abdullah, Wan Rafizah and Zakaria, Azmi and Hashim, Mansor and Rahman, Md. Mahmudur and Mohd Ghazali, Mohd Sabri (2016) Stability of ZnO-Pr6o11-Cr2O3 varistor ceramics against electrical degradation. Materials Science Forum, 846. pp. 115-125. ISSN 0255-5476; ESSN: 1662-9752 http://www.scientific.net/MSF.846.115 10.4028/www.scientific.net/MSF.846.115 |
| spellingShingle | Wan Abdullah, Wan Rafizah Zakaria, Azmi Hashim, Mansor Rahman, Md. Mahmudur Mohd Ghazali, Mohd Sabri Stability of ZnO-Pr6o11-Cr2O3 varistor ceramics against electrical degradation |
| title | Stability of ZnO-Pr6o11-Cr2O3 varistor ceramics against electrical degradation |
| title_full | Stability of ZnO-Pr6o11-Cr2O3 varistor ceramics against electrical degradation |
| title_fullStr | Stability of ZnO-Pr6o11-Cr2O3 varistor ceramics against electrical degradation |
| title_full_unstemmed | Stability of ZnO-Pr6o11-Cr2O3 varistor ceramics against electrical degradation |
| title_short | Stability of ZnO-Pr6o11-Cr2O3 varistor ceramics against electrical degradation |
| title_sort | stability of zno-pr6o11-cr2o3 varistor ceramics against electrical degradation |
| url | http://psasir.upm.edu.my/id/eprint/35673/ http://psasir.upm.edu.my/id/eprint/35673/ http://psasir.upm.edu.my/id/eprint/35673/ http://psasir.upm.edu.my/id/eprint/35673/1/Stability%20of%20ZnO-Pr6o11-Cr2O3%20varistor%20ceramics%20against%20electrical%20degradation.pdf |