Temperature dependent conductivity of Bi4Ti3O12 ceramics induced by Sr dopants
- 24 Downloads
Bi4Ti3O12 is an important lead-free ferroelectric material. Doping modification of Bi4Ti3O12 has attracted great attention to improving its performances. In this work, the effect of Sr dopants on the microstructure, dielectric, and conductivity of Bi4Ti3O12 ceramic was investigated by XRD, SEM, and AC impedance spectroscopy. Substitution of 1 at% Sr for Bi decreased the grain size, suppressed the dielectric dispersion of Bi4Ti3O12 ceramic at room temperature, and resulted in different effects on the conductivity of grains and grain boundaries. The conductivity of grains in Bi4Ti3O12 ceramic was increased by the small amount of Sr dopants in the whole experimental temperature range. While the grain boundaries of 1 at% Sr-doped Bi4Ti3O12 exhibited lower conductivity than pure Bi4Ti3O12 below ~380 °C and higher conductivity above ~380 °C. The experimental phenomena were interpreted in term of compensating defects for Sr dopants.
Keywordsdielectric impedance analysis electrical properties defects Aurivillius compound
This work is supported by National Basic Research Program of China (No. 2016YFB0700502) and National Natural Science Foundation of China (No. 51372024).
- Aurivillius B. Mixed bismuth oxides with layer lattices. Arkiv Kemi 1949, 1: 463–480, 499–512.Google Scholar
- Chang Q, Fan H, Long C. Effect of isovalent lanthanide cations compensation for volatilized A-site bismuth in Aurivillius ferroelectric bismuth titanate. J Mater Sci: Mater El 2017, 28: 4637–4646.Google Scholar
- Speight JG. Lange’s Handbook of Chemistry. McGraw-Hill, 2005.Google Scholar
- Rodriguez-Carvajal J. Fullprof: A program for Rietveld refinement and pattern matching analysis. In Proceedings of the Satellite Meeting on Powder Diffraction of the XV congress of the IUCr, 1990: 127.Google Scholar
- Smyth DM. The Defect Chemistry of Metal Oxides. Oxford University Press, 2000.Google Scholar