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High voltage SnO2 varistors prepared from nanocrystalline powders

Shahraki, M. M ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1007/s10854-009-9893-4
  3. Publisher: 2010
  4. Abstract:
  5. In this study, SnO 2-based varistors were prepared from mechanically activated nanocrystalline powders. Nanocrystalline powders were derived by subjecting the initial powders to intensive high-energy activation with different times and ball to powder ratio. The effect of activation parameters on the powder properties and sintering temperature, as well as microstructural, micro-electrical and macro-electrical properties of the final specimens was evaluated. Varistors derived from high-energy mechanical activation exhibit a higher density (98.3% relative density) and more refined microstructure upon sintering at 1,300 °C in comparison varistors prepared from conventional powders. Breakdown voltage and nonlinear coefficient were increased up to 24 kV/cm and 45 respectively
  6. Keywords:
  7. Activation parameter ; Ball-to-powder ratios ; Breakdown voltage ; Electrical property ; High energy ; High voltage ; Mechanical activation ; Micro-structural ; Nonlinear coefficient ; Powder properties ; Refined microstructure ; Relative density ; Sintering temperatures ; Activation energy ; Electric properties ; High energy physics ; Powders ; Sintering ; Varistors ; Nanocrystalline powders
  8. Source: Journal of Materials Science: Materials in Electronics ; Volume 21, Issue 2 , 2010 , Pages 199-205 ; 09574522 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs10854-009-9893-4