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Ferroelectric and piezoelectric properties of Aurivillius phase intergrowth ferroelectrics and the underlying materials design
Author(s) -
Yi Z. G.,
Li Y. X.,
Liu Y.
Publication year - 2011
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201000077
Subject(s) - aurivillius , natural bond orbital , materials science , piezoelectricity , ferroelectricity , ceramic , doping , hysteresis , condensed matter physics , ferroelectric ceramics , phase (matter) , mineralogy , composite material , optoelectronics , chemistry , physics , density functional theory , dielectric , computational chemistry , organic chemistry
Ferroelectric and piezoelectric properties of the La‐doped intergrowth Aurivillius phase ceramics Bi 5− x La x TiNbWO 15 and Bi 7− x La x Ti 4 NbO 21 ( x = 0.00–1.75) were studied. It was found that the La doping is in favour of the domain switching. Owing to the impact of defects, the P – E hysteresis loops of the La‐doped Bi 5 TiNbWO 15 ceramics are un‐symmetrical and the piezoelectric coefficients are quite low. Enhanced ferro‐/piezoelectric properties, such as 2 P r of 24.4 µC/cm 2 ( x = 0.50) and d 33 of 16.6 pC/N ( x = 0.75), were obtained in the Bi 7− x La x Ti 4 NbO 21 ceramics. The high temperature electrical behaviour indicates that the Bi 5− x La x TiNbWO 15 ceramics are semiconducting whereas the La‐doped Bi 7 Ti 4 NbO 21 ceramics are worthy to be further studied toward high temperature piezoelectric applications. Finally, the underlying materials design is discussed.