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- 저자 : Qaid Salem A. S. (검색결과 1 건)
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Qaid Salem A. S.,Issa M. A. A.,Hassib A. M.,Al-Asbahi Bandar Ali,Abuassaj E. M.,Ahmed Abdullah Ahmed Ali 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.6
The eff ects of diff erent synthesis routes and sintering temperatures on the microstructures and electrical properties of ceramic varistors (composed of ZnO doped with Pr 6O11, Co 3O4, Cr 2O3, and Nd 2O3) were investigated. Two types of samples were prepared according to the milling approach (single-mill or double-mill). Remilling the calcined powder material reduced the required sintering temperature by 100 °C, improved the microstructure of the ceramic, and enhanced the nonlinear properties of the varistor. Though the diff erent sintering temperatures and average grain sizes, both types were reach ≈ 98% of the theoretical density. The highest nonlinear coeffi cient value was ≈ 26.5, obtained from the fi rst sample of the double- mill batch. As the sintering temperature increased, the nonlinearity diminished rapidly in the case of single-mill samples compared to double-mill ones. Similar behavior was noted for the varistor (breakdown) voltage. The thermionic emission behavior at the pre-breakdown region and the conduction mechanism through Schottky barriers were applied to fi nd further electrical parameters.
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