Giant Electrostrictive Responses and Temperature Insensitive Strain in Barium Titanate‐Based Ceramics

Here, a large electrostrictive response and temperature‐insensitive strain in BaTiO3 ceramics are realized by introducing (M0.5N0.5)TiO3 (M = K/Na/Li, N = rare earth elements). Temperature (25–130 °C) insensitivity of the giant electrostrictive coefficient (Q 33 = 0.05–0.07 m4 C−2) is observed in BT‐(Li, Ho/Y/Yb)T ceramics, which is almost twice larger than those of other classical ferroelectric ceramics. In addition, the overall variation of the strain value in 0.95BaTiO3–0.05(Li0.5Ho0.5)TiO3 [BT‐(Li, Ho)T] ceramics is less than 5% in the temperature range of room temperature to 130 °C, which is obviously superior to the reported results. It is also found that the Curie temperature of this work can be increased up to 130–145 °C by optimizing the compositions. It is believed that the temperature‐insensitive strain and giant electrostrictive effect can promote the development of lead‐free BaTiO3 ceramics.