Publication

Abstract : The effect of doping of Fe at Cu2+ and Ti4+ sites in calcium copper titanate, CaCu3Ti4O12, has been examined. The compositions CaCu3−xFexTi4O12 (CCFTO) and CaCu3Ti4-xFexO12 (CCTFO), (xnbsp;=nbsp;0.10) have been synthesized by citrate nitrate gel route. XRD analysis confirms the formation of single- phase ceramics on sintering at 900nbsp;°C for 8nbsp;h. Structure of CaCu3Ti4O12 does not change on doping with iron on Cu-site or Ti-site and it remains cubic. Surface morphology indicates that the average grain size is in range of 30–90nbsp;$μ$m and 5–7nbsp;$μ$m for systems CCFTO and CCTFO, respectively. EDX studies confirm the presence of Ca2+, Cu2+, Ti4+ and Fe3+ ions as per stoichiometry of ceramics. The grain resistance of CCTFO is higher than that of CCFTO. Values of dielectric constant ($ε$ r ) and dielectric loss (tan$δ$) of CCTFO are higher than those of CCFTO ceramic at all measured frequencies and temperatures.