Dielectric properties of CaCu 2·9Co 0·1Ti 4O 12 and CaCu 3Ti 3·9Co 0·1O 12 ceramics synthesized by semi-wet route

Abstract

The effect of Co +2 doping on Cu +2 and Ti+4 sites in calcium copper titanate, CaCu 3Ti 4O 12, has been examined. The doped compositions, CaCu 3-xCo xTi 4O 12 and CaCu 3Ti 4-xCo xO 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 3Ti 4O 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 2·9Co 0·1Ti 4O 12 to be larger than CaCu 3Ti 3·9Co 0·1O 12 ceramic. Energy dispersive X-ray spectroscopy (EDX) studies confined the purity of parent and Co-doped CaCu 3Ti 4O 12 ceramics. Dielectric constant (ε r) and dielectric loss (tan δ) of CaCu 2·9Co 0·1Ti 4O 12 is comparatively higher than that of CaCu 3Ti 3·9Co 0·1O 12 ceramic at all measured frequencies and temperatures. © Indian Academy of Sciences.