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

For bismuth layered structural ferroelectrics (BLSFs), CaBi2Ta2O9 (CBTa) demonstrates valuable application potential for a high Curie temperature (TC) of 923 degrees C and a good hightemperature resistivity, but low piezoelectric constant d33 values. Compared with CBTa-based ceramics, CaBi2Nb2O9 (CBN) with a high TC of 940 degrees 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 Ca0.94(LiCe)0.03Bi2Ta2O9xCa0.94(LiCe)0.03Bi2Nb2O9 (LC-CBTa-xCBN) is fabricated to obtain the advantages of both of them. Moreover, optimal electrical performances are obtained in the LC-CBTa-0.4CBN ceramic (d33 similar to 14.1 pC/N, p similar to 1.08 x 106 at 600 degrees C, TC similar to 940 degrees 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.