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The microstructure, dielectric response, and nonlinear current-voltage properties of Sr 2+ -doped CaCu 3 Ti 4 O 12 /CaTiO 3  (CCTO/CTO) ceramic composites, which were prepared by a solid-state reaction method using a single step from the starting nominal composition of CCTO/CTO/xSrO, were investigated. The CCTO and CTO phases were detected in the X-ray diffraction patterns. The lattice parameter increased with increasing Sr 2+  doping concentration. The phase compositions of CCTO and CTO were confirmed by energy-dispersive X-ray spectroscopy with elemental mapping in the sintered ceramics. It can be confirmed that most of the Sr 2+  ions substituted into the CTO phase, while some minor portion substituted into the CCTO phase. Furthermore, small segregation of Cu-rich was observed along the grain boundaries. The dielectric permittivity of the CCTO/CTO composite slightly decreased by doping with Sr 2+ , while the loss tangent was greatly reduced. Furthermore, the dielectric properties in a high-temperature range of the Sr 2+ -doped CCTO/CTO ceramic composites can be improved. Interestingly, the nonlinear electrical properties of the Sr 2+ -doped CCTO/CTO ceramic composites were significantly enhanced. The improved dielectric and nonlinear electrical properties of the Sr 2+ -doped CCTO/CTO ceramic composites were explained by the enhancement of the electrical properties of the internal interfaces.

Influences of Sr2+ Doping on Microstructure, Giant Dielectric Behavior, and Non-Ohmic Properties of CaCu3Ti4O12/CaTiO3 Ceramic Composites