Crystal structure and electrical properties of textured Ba2Bi4Ti5O18 ceramics
journal contributionposted on 13.12.2018, 10:25 by Jun Cao, Vladimir Koval, Hangfeng Zhang, Yunyin Lin, Jiyue Wu, Nan Meng, Yan Li, Zheng Li, Hongtao Zhang, Haixue Yan
Highly textured Ba2Bi4Ti5O18 ceramic was prepared by spark plasma sintering (SPS). X-ray diffraction of the ceramics revealed the coexistence of a major ferroelectric phase (Space group, SG: B2cb) and a minor paraelectric phase (SG: I4/mmm) at room temperature. A diffused phase transition was observed at around 240 °C. The evolution of the switching current peaks in the electric current vs. electric field (I-E) loops with increasing temperature was interpreted by the structural changes and temperature dependent polarisation reversal processes. The slim polarisation vs. electric field (P-E) loops, the extra switching current peaks in the I-E loops and the non-zero piezoelectric d33 coefficient indicate that Ba2Bi4Ti5O18 is a relaxor ferroelectric material. The recoverable energy density (0.41 ± 0.01 J/cm3) of Ba2Bi4Ti5O18 ceramics in the perpendicular direction to the SPS pressing direction is close to that of Pb(Mg1/3Nb2/3)O3-based ceramics. The obtained results suggest Ba2Bi4Ti5O18 ceramics might be promising for energy storage applications.
Jun Cao would like to thank China Scholarship Council (CSC) for the financial supporting of four years studying in the UK. This work was supported by the Grant Agency of the Slovak Academy of Sciences under Grant No. 2/0059/17.
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