Influence of Sm3 + doping on the dielectric properties of CaCu3Ti4O12 ceramics synthesized via autocombustion

Ca1 − xSmxCu3Ti4O12 (x = 0.0, 0.2, 0.3) electronic ceramics were fabricated via the chemical route using metal nitrate solutions in order to improve the dielectric properties of this ceramic. X-ray diffraction (XRD) analysis indicated the formation of a single CaCu3Ti4O12 (CCTO). Grain size of the samples doped with Sm3 + was in the range of 1–2 μm, as opposed to 50–100 μm in the pure samples of CCTO. The cutoff frequency with the doping was remarkably shifted, from 1 MHz (pure CCTO) to 10 MHz (doped CCTO). Meanwhile, the real dielectric (εr) and imaginary dielectric (ε″) constants showed a decrease as the doping was increased.