The influence of the CuO-TiO 2 phase (CT) on dielectric properties of the CCTO ceramic was investigated. CaCu X Ti Y O 12 (CC X T Y O) powders were prepared based on the coprecipitated method, where 2.70 ≤ x ≤ 3.30 and 3.25 ≤ y ≤ 4.75. XRD patterns confirmed the presence of CCTO and also the secondary phases as CuO, TiO 2 , and CaTiO 3 for each sample and aided in its quantification. Scanning Electron Microscopy (SEM) shows secondary phases evolution in the grain boundaries, and its influence on size and morphology of the grains. Impedance spectroscopy measurements showed that the ceramics with lower amount of CuO and TiO 2 phases (CT/deficient ceramics) exhibited the highest ε′ values (2.1 × 10 4 at 1 kHz for CC 2.9 T 3.75 O ceramic). Also, CT/deficient ceramics showed lower tanδ values (0.090 at 1 kHz for CC 2.9 T 3.75 O ceramic) than ceramics prepared with excessive CuO-TiO 2 phase (0.241 at 1 kHz for CC 3.1 T 4.25 O ceramics). The deficiency of CuO and TiO 2 phases associated with high percentage of CCTO and CaTiO 3 phases resulted in ceramics with the higher ε′ values.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.