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Novel multifunctional capacitor-varistor ceramics based on SnO2

Maleki Shahraki, M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ceramint.2018.08.031
  3. Publisher: Elsevier Ltd , 2018
  4. Abstract:
  5. Up to now, multifunctional varistor-capacitor materials were based on TiO2, even though these materials failed to have practical applications. For the first time, in this research, multifunctional varistor-capacitor properties are observed in the CuO-doped SnO2-CoO-Sb2O3 system. The XRD analysis showed that this system has a single phase microstructure. SEM images indicated that the CuO addition resulted in a better densification and larger grain size. The very low electric breakdown field of the CuO-doped SnO2-CoO-Sb2O3 system (12 V/mm, similar to TiO2), is a consequence of coarse-grained microstructure. This varistor had a suitable surge withstand capability as well. The colossal dielectric constant of about 4.5 * 104 was observed in CuO doped-SnO2 system. This immense constant dielectric can be explained by the internal barrier layer capacitor model. These results attest that the novel multifunctional varistor-capacitor materials based on SnO2 can be used in practical applications. © 2018 Elsevier Ltd and Techna Group S.r.l
  6. Keywords:
  7. Colossal dielectric constant ; SnO2 ; Varistor-Capacitor ; Antimony compounds ; Cobalt compounds ; Copper oxides ; Electric breakdown ; High-k dielectric ; Microstructure ; Titanium dioxide ; Capacitor materials ; Coarse-grained ; Internal barrier layer capacitors ; Low electric breakdown field ; Single phase microstructure ; Varistor ceramics ; Varistors
  8. Source: Ceramics International ; Volume 44, Issue 16 , 2018 , Pages 20386-20390 ; 02728842 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0272884218320911?via%3Dihub