Polarization and strain behaviors of 0.74BiNaTiO3–0.26SrTiO3/Bi0.5(Na0.8K0.2)0.5TiO3 ceramic composite

We investigated the temperature- and frequency-dependent polarization and strain of two bismuth-based perovskite materials, a matrix material and a seed material, with which we formed a composite whose properties we likewise investigated. The chosen matrix material is 0.74Bi0.5Na0.5TiO3–0.26SrTiO3 (BNT-ST) which has a transition point of ~65 °C, from the relaxor to the ferroelectric phase (TR-F). The seed material was Bi0.5(Na0.8K0.2)0.5TiO3 (BNKT), which possesses a TR-F of 120 °C. Different polarization and strain behaviors were observed in the BNT-ST/BNKT composite at different test temperatures. At T=25 °C (TR-F °f the relaxor BNT-ST and