Dielectric properties of CaCu 3Ti 4− xCo xO 12 ( x = 0.10, 0.20, and 0.30) synthesized by semi-wet route

Abstract

Undoped CaCu 3Ti 4O 12 and cobalt doped CaCu 3Ti 4− x Co x O 12 (CCTCO) with x = 0.10, 0.20 and 0.30 were prepared by semi-wet route for the first time using solid TiO 2 powder and metal nitrate solutions. XRD analysis confirmed the formation of single-phase material in the samples sintered at 900 °C for 6 h. Structure does not change on doping with cobalt and it remains cubic in all the three compositions studied. Lattice parameter increases slightly with cobalt doping. SEM micrographs of the CaCu 3Ti 4− x Co x O 12 samples show that the grain size is in the range of 2–8 μm for these samples. EDX studies show the percentage of elements along with the grain and grain boundary, which confirm the rich phase of copper oxide at grain boundaries. Dielectric properties have been measured as a function of temperature and frequency.