High thermal stability of piezoelectric properties in (Na0.5Bi0.5TiO3)x–(BaTiO3)y–(Na0.5K0.5NbO3)1-x-y ceramics

摘要

We report the piezoelectric and ferroelectric properties of (Na0.5Bi0.5TiO3)x–(BaTiO3)y–(Na0.5K0.5NbO3)1-x-y ceramics for Na0.5K0.5NbO3 rich end of composition (x, y ≤ 0.04 mol. %). These compositions were found to exhibit significantly improved thermal stability of piezoresponse. Variation of dielectric constant as a function of temperature revealed that orthorhombic–tetragonal (To-t) and tetragonal–cubic (Tc) transition temperatures for these compositions were in the vicinity of 0 °C and 330 °C, respectively. Dynamic scaling and temperature dependent X-ray diffraction analysis were conducted. Results are discussed in terms of intrinsic and extrinsic contributions to the piezoelectric response explaining the temperature dependent behavior.