Publication Type : Journal Article
Thematic Areas : Nanosciences and Molecular Medicine
Publisher : Ceramics International
Source : Ceramics International, Volume 40, Number 1, Part A, p.181 - 189 (2014)
Url : http://www.sciencedirect.com/science/article/pii/S0272884213006378
Keywords : D. Perovskites
Campus : Kochi
School : Center for Nanosciences
Center : Nanosciences
Department : Nanosciences and Molecular Medicine
Year : 2014
Abstract : Abstract Effect of praseodymium (Pr3+) substitution at Ca2+ site in calcium copper titanate, CaCu3Ti4O12 (CCTO), has been investigated. Compositions with x=0.10 and 0.20 were synthesized in the system Ca(1−3x/2)PrxCu3Ti4O12 by chemical route. Crystal structure is remained cubic. X-ray diffraction and field-emission scanning electron macrographs indicate the presence of secondary phases such as CaTiO3 and CuO. X-ray photoelectron spectroscopy suggests the substitution of Ca2+ by Pr3+/Pr4+. Low temperature admittance spectroscopy identified two deep trapping levels at 0.098 and 0.073 eV for x=0.20 and 0.078 and 0.060 eV for x=0.10. High temperature impedance spectroscopy shows that the grain boundary potential is 0.40 eV and 0.48 eV for x=0.20 and x=0.10 samples respectively. Pr3+ doping decreases dielectric loss in the bulk at low temperature but increases the dc leakage due to the lower value of grain boundary potential.
Cite this Research Publication : A. Kumar Rai, Gim, J., Shin, E. -chol, Seo, H. - H., Mathew, V., Mandal, K. D., Parkash, O., Lee, J. - S., and Kim, J., “Effects of praseodymium substitution on electrical properties of CaCu 3 Ti 4 O 12 ceramics”, Ceramics International, vol. 40, pp. 181 - 189, 2014.