Piezoelectric properties of domain engineered barium titanate single crystals with different volume fractions of domain walls

Xiang, Yanhong; Zhang, Rui; Cao, Wenwu

doi:10.1063/1.3212977

Cited by 18 publications

(13 citation statements)

References 17 publications

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“…113 Along with enhanced conductivity and other potential functionalities, CDW enhanced piezo-response was also actively analyzed. [69][70][71]101,[118][119][120] SUMMARY AND OUTLOOK The last decade was marked by a tremendous progress in investigation of ferroelectric CDWs. The field has evolved into a vast area of experimental and theoretical studies with promising results for applications.…”

Section: Cdw Functionalitiesmentioning

confidence: 99%

Physics and applications of charged domain walls

Bednyakov

Sturman

Sluka³

et al. 2018

npj Comput Mater

155

158

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The charged domain wall is an ultrathin (typically nanosized) interface between two domains; it carries bound charge owing to a change of normal component of spontaneous polarization on crossing the wall. In contrast to hetero-interfaces between different materials, charged domain walls (CDWs) can be created, displaced, erased, and recreated again in the bulk of a material. Screening of the bound charge with free carriers is often necessary for stability of CDWs, which can result in giant two-dimensional conductivity along the wall. Usually in nominally insulating ferroelectrics, the concentration of free carriers at the walls can approach metallic values. Thus, CDWs can be viewed as ultrathin reconfigurable strongly conductive sheets embedded into the bulk of an insulating material. This feature is highly attractive for future nanoelectronics. The last decade was marked by a surge of research interest in CDWs. It resulted in numerous breakthroughs in controllable and reproducible fabrication of CDWs in different materials, in investigation of CDW properties and charge compensation mechanisms, in discovery of light-induced effects, and, finally, in detection of giant two-dimensional conductivity. The present review is aiming at a concise presentation of the main physical ideas behind CDWs and a brief overview of the most important theoretical and experimental findings in the field.

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Section: Cdw Functionalitiesmentioning

confidence: 99%

Physics and applications of charged domain walls

Bednyakov

Sturman

Sluka³

et al. 2018

npj Comput Mater

155

158

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“…In classic lead-free materials such as BaTiO 3 and KNbO 3 for example, creating frustrated ferroelectric domains by external fields has been shown to substantially enhance piezoelectric response 16,17 . However, the exact mechanism of this phenomenon has been the subject of extensive debate in recent years [19][20][21][22][23][24][25][26][27] ; the possible existence of a monoclinic phase in BaTiO 3 single crystals has been reported 25,28,29 , but it has never been directly imaged on a microscopic level. As a result, the important question of whether the observed phase is of intrinsic monoclinic symmetry, or in fact corresponds to a symmetry-adaptive superlattice of nanodomains 21,[30][31][32][33][34][35][36][37] (such as those observed in MPBs) remains open.…”

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confidence: 99%

Thermotropic phase boundaries in classic ferroelectrics

et al. 2014

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High-performance piezoelectrics are lead-based solid solutions that exhibit a so-called morphotropic phase boundary, which separates two competing phases as a function of chemical composition; as a consequence, an intermediate low-symmetry phase with a strong piezoelectric effect arises. In search for environmentally sustainable lead-free alternatives that exhibit analogous characteristics, we use a network of competing domains to create similar conditions across thermal inter-ferroelectric transitions in simple, lead-free ferroelectrics such as BaTiO 3 and KNbO 3 . Here we report the experimental observation of thermotropic phase boundaries in these classic ferroelectrics, through direct imaging of low-symmetry intermediate phases that exhibit large enhancements in the existing nonlinear optical and piezoelectric property coefficients. Furthermore, the symmetry lowering in these phases allows for new property coefficients that exceed all the existing coefficients in both parent phases. Discovering the thermotropic nature of thermal phase transitions in simple ferroelectrics thus presents unique opportunities for the design of 'green' high-performance materials.

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“…Prominent examples of such functional property enhancements can be found in the lead‐based solid solution perovskites that exhibit large piezoelectric coefficients near a morphotropic phase boundary (MPB) or colossal magnetoresistance near a magnetic transition . Considerable scientific effort has been devoted to find more benign (i.e., lead‐free) high‐performance piezoelectrics, which would offer comparable performance . In thin films, biaxial strain tuning with 1%–6% strains has been demonstrated to be powerful for inducing emergent phenomena and property enhancements .…”

mentioning

confidence: 99%

Emergent Low‐Symmetry Phases and Large Property Enhancements in Ferroelectric KNbO₃ Bulk Crystals

et al. 2017

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The design of new or enhanced functionality in materials is traditionally viewed as requiring the discovery of new chemical compositions through synthesis. Large property enhancements may however also be hidden within already well-known materials, when their structural symmetry is deviated from equilibrium through a small local strain or field. Here, the discovery of enhanced material properties associated with a new metastable phase of monoclinic symmetry within bulk KNbO is reported. This phase is found to coexist with the nominal orthorhombic phase at room temperature, and is both induced by and stabilized with local strains generated by a network of ferroelectric domain walls. While the local microstructural shear strain involved is only ≈0.017%, the concurrent symmetry reduction results in an optical second harmonic generation response that is over 550% higher at room temperature. Moreover, the meandering walls of the low-symmetry domains also exhibit enhanced electrical conductivity on the order of 1 S m . This discovery reveals a potential new route to local engineering of significant property enhancements and conductivity through symmetry lowering in ferroelectric crystals.

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Piezoelectric properties of domain engineered barium titanate single crystals with different volume fractions of domain walls

Cited by 18 publications

References 17 publications

Physics and applications of charged domain walls

Physics and applications of charged domain walls

Thermotropic phase boundaries in classic ferroelectrics

Emergent Low‐Symmetry Phases and Large Property Enhancements in Ferroelectric KNbO₃ Bulk Crystals

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Piezoelectric properties of domain engineered barium titanate single crystals with different volume fractions of domain walls

Cited by 18 publications

References 17 publications

Physics and applications of charged domain walls

Physics and applications of charged domain walls

Thermotropic phase boundaries in classic ferroelectrics

Emergent Low‐Symmetry Phases and Large Property Enhancements in Ferroelectric KNbO3 Bulk Crystals

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Emergent Low‐Symmetry Phases and Large Property Enhancements in Ferroelectric KNbO₃ Bulk Crystals