Dielectric properties of CaCu3Ti4O12 ceramics doped with aluminium and fluorine

The ceramics CaCu3Ti4-xAlxO12-0.5x-yFy were prepared using solid-state reactions technique and pre-synthesized CaTiO3. It was found that the resistances of both the grain boundary RGB and the interface between sample and electrode RSE increase at the combined introduction of Al3+ and F- ions. At 1100 degrees C, a decrease in dielectric properties after 12 h of sintering time due to copper losses was observed. The samples with x/ y = 0.04/0.04 sintered for 10 h at 1 kHz are characterized by the following dielectric parameters: epsilon' approximate to 72,000 and tan delta approximate to 0.047. In the sample x/y = 0.04/0, the lowest dielectric loss (tan delta approximate to 0.044) were found. (c) 2021 Elsevier B.V. All rights reserved.

Automated summary

The resistances of grain boundary and interface between sample and electrode increase with the combined introduction of Al3+ and F- ions. After 12 hours of sintering, a decrease in dielectric properties was observed due to copper losses. Samples sintered for 10 hours at 1 kHz exhibit specific dielectric parameters.