Ferroelectric and piezoelectric properties of (Ba0.7Ca0.3)(Ti1−xSnx)O3 lead-free ceramics

摘要

The ferroelectric and piezoelectric properties of Sn modified (BaCa)(TiSn)O, (with x = 0.000 to 0.100 in steps of 0.025) lead free electroceramics were investigated. With Sn substitution, a structural phase transition from pure tetragonal to pseudo-cubic structure has been observed; which strongly influence the ferroelectric/ piezoelectric nature of the samples. At room temperature, all the samples exhibit typical polarization-electric field hysteresis as well as field induced strain butterfly loop which confirms the ferroelectric and piezoelectric nature. As Sn content increases, the ferroelectric properties seems to be suppressed while the piezoelectric properties gets improved up to x = 0.075 and then decreased. Moderately high remanent polarization (P) and low coercive field (E) were observed for all compositions, which may be essential for storage and switching applications.