Publication Type:

Journal Article

Source:

Bulletin of Materials Science, Volume 35, Number 3, p.433–438 (2012)

URL:

http://dx.doi.org/10.1007/s12034-012-0301-y

Abstract:

The effect of Co þinspace+þinspace2 doping on Cu þinspace+þinspace2 and Ti þinspace+þinspace4 sites in calcium copper titanate, CaCu 3 Ti 4 O 12 , has been examined. The doped compositions, CaCu \$\_\{{\backslash}bf 3-{\backslash}emph\{x\}\}\$ Co \$\_\{{\backslash}bf {\backslash}emph\{x\}\}\$ Ti 4 O 12 and CaCu 3 Ti \$\_\{{\backslash}bf 4-{\backslash}emph\{x\}\}\$ Co \$\_\{{\backslash}bf {\backslash}emph\{x\}\}\$ O 12 (x = 0·10) ceramics, were prepared by novel semi-wet route. In this method, calcium, copper and cobalt salts were taken in solution form and TiO 2 was used in solid form. XRD analysis confirmed the formation of single-phase materials. Structure of CaCu 3 Ti 4 O 12 does not change on doping with cobalt either on Cu-site or Ti-site and it remains cubic. Scanning electron micrographs (SEM) show average grain size of CaCu 2·9 Co 0·1 Ti 4 O 12 to be larger than CaCu 3 Ti 3·9 Co 0·1 O 12 ceramic. Energy dispersive X-ray spectroscopy (EDX) studies confined the purity of parent and Co-doped CaCu 3 Ti 4 O 12 ceramics. Dielectric constant ($ε$ r) and dielectric loss (tan $δ$) of CaCu 2·9 Co 0·1 Ti 4 O 12 is comparatively higher than that of CaCu 3 Ti 3·9 Co 0·1 O 12 ceramic at all measured frequencies and temperatures.

Cite this Research Publication

K. D. Mandal, Rai, A. Kumar, Singh, L., and PARKASH, O. M., “Dielectric properties of CaCu 2·9 Co 0·1 Ti 4 O 12 and CaCu 3 Ti 3·9 Co 0·1 O 12 ceramics synthesized by semi-wet route”, Bulletin of Materials Science, vol. 35, pp. 433–438, 2012.