Insight into the Ultrahigh Electric Performance of Aurivillius CBTa-CBN Solid Solution.

For bismuth layered structural ferroelectrics (BLSFs), CaBi 2 Ta 2 O 9 (CBTa) demonstrates valuable application potential for a high Curie temperature ( T C ) of 923 °C and a good high-temperature resistivity, but low piezoelectric constant d 33 values. Compared with CBTa-based ceramics, CaBi 2 Nb 2 O 9 (CBN) with a high T C of 940 °C is easy to modify and realize excellent enhancement of piezoelectric properties. Here, by introducing a CBN-based component into CBTa, a new type of solid-solution ceramic with the formula Ca 0.94 (LiCe) 0.03 Bi 2 Ta 2 O 9 - x Ca 0.94 (LiCe) 0.03 Bi 2 Nb 2 O 9 (LC-CBTa- x CBN) is fabricated to obtain the advantages of both of them. Moreover, optimal electrical performances are obtained in the LC-CBTa-0.4CBN ceramic ( d 33 ∼ 14.1 pC/N, ρ ∼ 1.08 × 10 6 at 600 °C, T C ∼ 940 °C). The correlated characterizations, including structure and electricity, provide further realization of an enhanced performance mechanism. Therefore, this method of constructing a new type of solid solution provides a new strategy to modify BLSFs.