Crystal structure and electrical properties of textured Ba2Bi4Ti5O18 ceramics
2019
Abstract Highly textured Ba 2 Bi 4 Ti 5 O 18 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: B 2 cb ) 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 d 33 coefficient indicate that Ba 2 Bi 4 Ti 5 O 18 is a relaxor ferroelectric material. The recoverable energy density (0.41 ± 0.01 J/cm 3 ) of Ba 2 Bi 4 Ti 5 O 18 ceramics in the perpendicular direction to the SPS pressing direction is close to that of Pb(Mg 1/3 Nb 2/3 )O 3 -based ceramics. The obtained results suggest Ba 2 Bi 4 Ti 5 O 18 ceramics might be promising for energy storage applications.
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