Effect of CuO on Dielectric Properties of Perovskite Titanate and Hexagonal Manganite

Giant dielectric material CuO is chosen suitably to make composite with insulating SrTiO3 and semiconducting SrMnO3 by solid state reaction route. Ceramic samples of 30 & 40 wt% CuO with above parent matrix ceramics were prepared. From the XRD results it confirms the formation of perfect composites with semiconducting CuO as a secondary phase. Surface morphology study from SEM confirms the presence of both types of grains. Dielectric studies were carried out at four selected frequencies (1 kHz, 10 kHz, 100 kHz, 1 MHz). The result has shown the extraordinarily improved dielectric constant. Maxwell-Wagner polarization (interfacial polarization) was made responsible for the improved result. Dielectric loss also increased by a considerable manner