Effect of Sr/Ba Ratio on Dielectric Properties of BSTN Ceramics
The phase composition of (1-x)BaO·xSrO·0.7TiO2·0.3Nb2O5 (BSTN) composite ceramics was analyzed by XRD, and the effect of Sr/Ba ratio on the dielectric properties of BSTN was investigated by impedance analyzer. The results showed that any sample with different x value contained two phases-the perovskite phase and the tungsten bronze phase. The dielectric constants of BSTN basically decreased while the tanδ increased with the increase in x value. Both dielectric constant and tanδ decreased with the applied frequency increased for the same x value. There were two Curie points for BSTN composite ceramics. The first one belonging to the perovskite phase decreased with the increase in x value, but the second one belonging to the tungsten bronze phase kept almost constant at about 300°C.
Wei Pan and Jianghong Gong
Z. H. Zhou, X. Cheng, P. Y. Du, J. Chang, S. F. Huang, L. C. Lu, Z. M. Ye, "Effect of Sr/Ba Ratio on Dielectric Properties of BSTN Ceramics", Key Engineering Materials, Vols. 336-338, pp. 125-128, 2007