Superior lead-free high-temperature piezoceramics of BiFeO₃–BaTiO₃–(Bi_0.5Na_0.5)TiO₃ through cooperative regulation

Abstract

Simultaneously enhanced d33 and Tc values were realized in BF–BT-based lead-free MPB piezoceramics through cooperatively regulating the lattice distortion and content of rhombohedral phase, domain heterogeneity and defect concentration.

Simultaneous enhancement of piezoelectric properties and Curie temperature in BiFeO3–BaTiO3 lead-free ferroelectrics via simple B-site modification

“…5(f), the T c of BFC x –BT is gradually raised from 455 °C ( x = 0.00) to 493 °C ( x = 0.008), which is caused by the enhancement of lattice distortion. 16 This larger lattice distortion requires a higher energy barrier to trigger the phase transition and thus leads to a higher T c . 17…”

“…This peak value ( I max ) reflects the ability of domain switching. 16 To quantify this ability, the variation of each component's I max with the electric field ( E ) is presented in Fig. 8(h).…”

“…5(f), the T c of BFC x -BT is gradually raised from 455 1C (x = 0.00) to 493 1C (x = 0.008), which is caused by the enhancement of lattice distortion. 16 This larger lattice distortion requires a higher energy barrier to trigger the phase transition and thus leads to a higher T c . 17 Since the electrical properties of piezoceramics are strongly associated with the point defect, it is necessary to investigate these point defects in BF-BT.…”