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Investigation and Study of Microstructure, Dielectric and Non-ohmic Properties of tin and Cobalt Oxide Systems Co-Doped with Electron Donor and Acceptor Elements

Behdarvandan, Nazanin | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54023 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Nemati, Ali; Maleki Shahraki, Mohammad
  7. Abstract:
  8. In recent years, there are continuous researches on replacing new dielectrics with suitable dielectric properties (including high dielectric coefficient, low loss factor, high breakdown voltage, and high nonlinear coefficient simultaneously). One of these new materials is co-doped titanium oxide with donor and acceptor of electron, which in spite of having high dielectric coefficient and low loss factor. it has low breakdown voltage and researches on improving the disadvantages of this dielectric are ongoing. Due to the structural similarities between tin oxide and titanium oxide, the tin oxide can be an interesting system for studying and improving disadvantages in this field. In this study by changing the percentage of the donor and acceptor of electrons added to tin oxide, all of the properties above have measured and optimal properties also have obtained in sample SCNCr-0/01. Also, these properties had good stability with frequency changes. For preparing these ceramic pills, a uniaxial pressing method with a pressure of 250 MPa and a temperature of 1400 centigrade for 10 hours with a rate of 5 centigrade per minute was used
  9. Keywords:
  10. Dielectric Properties ; Microstructural Refining ; Tin Oxide-Cobalt Oxide ; Electron Donor and Acceptor ; Refractive Index ; Nonlinear Coefficient

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