Structure and Enhanced Dielectric Properties of B and Sr Modified CaCu3Ti4O12 Ceramics
- 18 Downloads
B doped CaCu3Ti4O12 (CCTO), Sr doped CCTO and (B + Sr) co-doped CCTO ceramics were synthesized using the citrate precursor process and were sintered at 1080°C for 3 h. The effects of B and/or Sr doping on dielectric properties, Raman spectra and resistance were studied. Raman results corroborate with the results of x-ray diffraction, and Raman spectra show a multiphonon phenomenon. The pure CCTO phase can be obtained by citrate precursor processing and a short sintering time. The micrographs reveal that B and Sr additions can speed the grain growth, and a dense and homogenous microstructure was obtained for B and Sr co-doped ceramic. The addition of B and Sr can increase the grain boundary resistance and enhance dielectric properties with dielectric constant of 12108 and dielectric loss of 0.044 at 10 kHz. Moreover, B and Sr additions can enhance the frequency stability (between 100 Hz and 50 kHz) and temperature stability (between 20°C and 100°C) of dielectric loss. The present results show that the microstructure characteristics and grain boundary response are the primary factors in improving the dielectric properties of CCTO ceramics.
KeywordsCaCu3Ti4O12 ceramics microstructure dielectric properties
Unable to display preview. Download preview PDF.
- 18.Z. Xu, H. Qiang, and J. Sol-Gel, Sci. Technol. 77, 650 (2016).Google Scholar