A feasible pathway to stabilize monoclinic and tetragonal phase coexistence in barium titanate-based ceramics

Abstract

Multiphase coexistence has attracted significant interest in recent years because its control has entailed a significant breakthrough for the piezoelectric activity enhancement of lead-free piezoelectric oxides. However, the comprehension of...

Lead-Free Textured Ceramics with Ultrahigh Piezoelectric Properties by Synergistic Design

“…Differently, our enhanced d 33 value was achieved without sacrifice of T c compared to the non-textured counterpart. The obtained d 33 of ∼820 pC N –1 , d 33 × g 33 of ∼23.5 × 10 –12 m 2 N –1 , and S max / E max of ∼2040 pm V –1 are also among the best values reported in BT-based piezoceramics. − ,− ,− Moreover, they are achieved at texture temperatures reduced substantially by 150–200 °C. Figure S9 of the Supporting Information shows d 33 as a function of the sintering temperature for the textured BCTZS ceramics doped with 0.4 wt % Li 2 CO 3 as an example.…”

“…Excitingly, significantly enhanced piezoelectric properties, i.e., d 33 of ∼820 pC N –1 , S max / E max of ∼2040 pm V –1 , and figure of merit d 33 × g 33 of ∼23.5 × 10 –12 m 2 N –1 , are simultaneously obtained without sacrificing T c compared to the non-textured counterpart. The comprehensive piezoelectric properties are superior to those of the widely utilized PZT commercial ceramics and are also among the best values reported for BT-based ceramics. − ,− ,− On the basis of the experiments and theoretical modeling, the underlying mechanisms for achieving such significantly enhanced piezoelectric performance are explored. This work provides important guidelines for developing novel ceramics with outstanding piezoelectric performance and can also widen application areas of textured BT-based ceramics into high-performance and multilayer electronic devices.…”

“…Pure BT ceramics have inferior piezoelectric properties; e.g., piezoelectric coefficient d 33 of ∼190 pC N –1 . Over the past few decades, numerous efforts have been made to improve piezoelectric properties of BT-based ceramics, especially through designing solid solution(s) via substituting the A and/or B site(s) with several ion species. − Breakthrough d 33 values of ∼620 and ∼700 pC N –1 were achieved, respectively, in (Ba 0.85 Ca 0.15 )­(Ti 0.90 Zr 0.10 )­O 3 (BZT-50BCT) and (Ba 0.946 Ca 0.054 )­(Ti 0.9098 Sn 0.0902 )­O 3 (BTS 0.11 -0.18BCT) ceramics fabricated by a conventional solid-state approach, through constructing a tri- or polycritical point among rhombohedral ( R ), orthorhombic ( O ), tetragonal ( T ), and/or cubic ( C ) phases near room temperature. Unfortunately, the enhanced piezoelectric properties are usually achieved with sacrifice of the Curie temperature ( T c ), and some T c values are even reduced to ∼30–50 °C, − ,− seriously limiting their temperature usage range.…”

Unusual crystal structure evolution, multiple phase boundaries and phase coexistence in (1 −x)Ba(Cu1/3Nb2/3)O3-(x)PbTiO3perovskite solid solution

“…The coexistence of monoclinic and tetragonal structures are observed to be very important and may lead to high responses of piezoelectric and dielectric properties. 46 In the 0.90 composition, only monoclinic (M 3 ) phase 3 transforms to a tetragonal structure (T 3 ); thus, the refined crystal structure consists of two coexisting tetragonal phases, both with the P4mm space group as confirmed from the Rietveld structure refinement. All the compositions in between the 0.90 and 0.975 compositions can be represented as 'T 2 + T 3 '.…”

Concomitant Light-Reversible Magnetic Response in Multiferroic Oxide Heterostructures for Multiphysics Applications

“…In this investigation, we embark on an exploration centered around the multiferroic Fe 3 O 4 /BaTiO 3 (100) system. Magnetite (Fe 3 O 4 ), renowned for its well-known ferromagnetism, magnetostriction, and half-metallic attributes, , is known to grow epitaxially on BaTiO 3 , a quintessential archetype of ferroelectric perovskite materials. , This harmonious fusion, based on the crystalline coherence at the interface between both materials, engenders a versatile spectrum of functionalities, spanning from electrochemical reduction and spintronics to the intricacies of multiferroicity. ,− In particular, previous studies have shown that, as a consequence of magnetoelectric coupling, the magnetic properties of Fe 3 O 4 can be indirectly affected by temperature and electric fields that change the ferroelectric order and/or strain state in BaTiO 3 . − Here, we report for the first time a completely reversible modulation of the magnetization of Fe 3 O 4 by means of low-intensity visible light illumination, a consequence of the magnetoelectric coupling with the light-induced ferroelectric domain rearrangement within BaTiO 3 .…”