1 research outputs found
Bismuth Ferrite-Based Lead-Free High-Entropy Piezoelectric Ceramics
Piezoelectric ceramics, as essential components of actuators
and
transducers, have captured significant attention in both industrial
and scientific research. The âentropy engineeringâ approach
has been demonstrated to achieve excellent performance in lead-based
materials. In this study, the âentropy engineeringâ
approach was employed to introduce the morphotropic phase boundary
(MPB) into the bismuth ferrite (BF)-based lead-free system. By employing
this strategy, a serial of novel âmedium to high entropyâ
lead-free piezoelectric ceramics were successfully synthesized, namely
(1âx)BiFeO3âx(Ba0.2Sr0.2Ca0.2Bi0.2Na0.2)TiO3 (BFâxBSCBNT, x = 0.15â0.5). Our investigation systematically examined
the phase structure, domain configuration, and ferroelectric/piezoelectric
properties as a function of conformational entropy. Remarkable performances
with a largest strain of 0.50% at 100 kV/cm, remanent polarization
âŒ40.07 ÎŒC/cm2, coercive field âŒ74.72
kV/cm, piezoelectric coefficient âŒ80 pC/N, and d33* âŒ500 pm/V were achieved in BFâ0.4BSCBNT
ceramics. This exceptional performance can be attributed to the presence
of MPB, coexisting rhombohedral and cubic phases, along with localized
nanodomains. The concept of high-entropy lead-free piezoelectric ceramics
in this study provides a promising strategy for the exploration and
development of the next generation of lead-free piezoelectric materials