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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...

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Main Authors: Wan Abdullah, Wan Rafizah, Zakaria, Azmi, Hashim, Mansor, Rahman, Md. Mahmudur, Mohd Ghazali, Mohd Sabri
Format: Article
Language:English
Published: Trans Tech Publications 2016
Online Access:http://psasir.upm.edu.my/id/eprint/35673/1/Stability%20of%20ZnO-Pr6o11-Cr2O3%20varistor%20ceramics%20against%20electrical%20degradation.pdf
http://psasir.upm.edu.my/id/eprint/35673/
http://www.scientific.net/MSF.846.115
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spelling my.upm.eprints.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
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
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.
format Article
author Wan Abdullah, Wan Rafizah
Zakaria, Azmi
Hashim, Mansor
Rahman, Md. Mahmudur
Mohd Ghazali, Mohd Sabri
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
author_facet Wan Abdullah, Wan Rafizah
Zakaria, Azmi
Hashim, Mansor
Rahman, Md. Mahmudur
Mohd Ghazali, Mohd Sabri
author_sort Wan Abdullah, Wan Rafizah
title Stability of ZnO-Pr6o11-Cr2O3 varistor ceramics against electrical degradation
title_short 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_sort stability of zno-pr6o11-cr2o3 varistor ceramics against electrical degradation
publisher Trans Tech Publications
publishDate 2016
url http://psasir.upm.edu.my/id/eprint/35673/1/Stability%20of%20ZnO-Pr6o11-Cr2O3%20varistor%20ceramics%20against%20electrical%20degradation.pdf
http://psasir.upm.edu.my/id/eprint/35673/
http://www.scientific.net/MSF.846.115
_version_ 1643831523545186304
score 13.211869

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