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View article: Stable crack propagation in dislocation-engineered oxide visualized by double cleavage drilled compression test
Stable crack propagation in dislocation-engineered oxide visualized by double cleavage drilled compression test Open
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View article: ⁷Li NMR short-range ordering in hardened lithium sodium niobate
⁷Li NMR short-range ordering in hardened lithium sodium niobate Open
Thermal treatments play a crucial role in tuning the functional properties of lithium-based perovskites, which are of interest for applications in energy storage, actuation and sensing. In the present work, the impact of aging and quenchin…
View article: Structural relaxation of ferroelectric phase in hard sodium lithium niobate solid solutions studied by solid-state NMR
Structural relaxation of ferroelectric phase in hard sodium lithium niobate solid solutions studied by solid-state NMR Open
Hard sodium lithium niobate (LNN) solid solutions offer a promising environmentally benign alternative to lead-based ferroelectric materials for electronic devices. A major challenge in their practical application is that their ferroelectr…
View article: Stable crack propagation in dislocation-engineered oxide visualized by double cleavage drilled compression test
Stable crack propagation in dislocation-engineered oxide visualized by double cleavage drilled compression test Open
Understanding crack tip - dislocation interaction is critical for improving the fracture resistance of semi-brittle materials like room-temperature plastically deformable ceramics. Here, we use a modified double cleavage drilled compressio…
View article: Precipitation hardening in lead-free Na0.5Bi0.5Ti03-BaTiO3
Precipitation hardening in lead-free Na0.5Bi0.5Ti03-BaTiO3 Open
Ferroelectric hardening is indispensable for piezoelectrics used in high-power applications, as it enhances their performance by avoiding thermal and dielectric breakdowns. Recently, precipitation hardening has been introduced as a promisi…
View article: Sintering at extreme rates: A comparative study between blacklight and ultrafast high‐temperature sintering
Sintering at extreme rates: A comparative study between blacklight and ultrafast high‐temperature sintering Open
Given the urgent need to address the climate and energy crisis, there is a growing emphasis on reducing energy consumption and time in ceramic sintering processes, which are pivotal in various industries. Innovative approaches, such as bla…
View article: Structural relaxation of ferroelectric phase in hard sodium lithium niobate solid solutions studied by Solid-State NMR
Structural relaxation of ferroelectric phase in hard sodium lithium niobate solid solutions studied by Solid-State NMR Open
Hard sodium lithium niobate (LNN) solid solutions offer a promising environmentally benign alternative to lead-based ferroelectric materials for electronic devices. A major challenge in their practical application is that their ferroelectr…
View article: Flexible piezoelectrics: integration of sensing, actuating and energy harvesting
Flexible piezoelectrics: integration of sensing, actuating and energy harvesting Open
Piezoelectric materials are capable of converting between mechanical and electrical energy, and are suitable for sensing, actuating and energy harvesting. While most conventional piezoelectric materials are brittle solids, flexible piezoel…
View article: Temperature-Stable High-Power Properties of (K, Na)NbO<sub>3</sub>-Based Piezoelectric Ceramics
Temperature-Stable High-Power Properties of (K, Na)NbO<sub>3</sub>-Based Piezoelectric Ceramics Open
Piezoelectric ceramics tailored for high-power resonance applications are investigated, utilizing a composite structure comprising the ferroelectric phase (K, Na)NbO3 as a matrix integrated with the alkali titanoniobate dielectric phase KT…
View article: Dislocation‐Induced Local and Global Photoconductivity Enhancement and Mechanisms in Iron‐Doped SrTiO<sub>3</sub>
Dislocation‐Induced Local and Global Photoconductivity Enhancement and Mechanisms in Iron‐Doped SrTiO<sub>3</sub> Open
Dislocations have a tremendous potential to alter band structure and transport properties. However, their impact on the optoelectronic properties of metal oxides is not thoroughly studied. This is mostly due to the early work on classical …
View article: Dislocation-engineered piezocatalytic water splitting in single-crystal BaTiO <sub>3</sub>
Dislocation-engineered piezocatalytic water splitting in single-crystal BaTiO <sub>3</sub> Open
Dislocations were introduced into BaTiO 3 single crystals and become catalytically active centers.
View article: Hardening of K0.5Na0.5NbO3 piezoceramics with Cu and the temperature dependence in high-power drive
Hardening of K0.5Na0.5NbO3 piezoceramics with Cu and the temperature dependence in high-power drive Open
This study investigates the relationship between the electro-mechanical properties of Cu-doped potassium sodium niobate (KNN) piezoceramics driven at high vibration velocities and their structural origins. Intrinsic and extrinsic contribut…
View article: Unlocking Electrostrain in Plastically Deformed Barium Titanate
Unlocking Electrostrain in Plastically Deformed Barium Titanate Open
Achieving substantial electrostrain alongside a large effective piezoelectric strain coefficient ( d 33 *) in piezoelectric materials remains a formidable challenge for advanced actuator applications. Here, a straightforward approach to en…
View article: Damage-tolerant oxides by imprint of an ultra-high dislocation density
Damage-tolerant oxides by imprint of an ultra-high dislocation density Open
Dislocations in ductile ceramics offer the potential for robust mechanical performance while unlocking versatile functional properties. Previous studies have been limited by small volumes with dislocations and/or low dislocation densities …
View article: Damage-tolerant oxides by imprint of an ultra-high dislocation density
Damage-tolerant oxides by imprint of an ultra-high dislocation density Open
Dislocations in ductile ceramics offer the potential for robust mechanical performance while unlocking versatile functional properties. Previous studies have been limited by small volumes with dislocations and/or low dislocation densities …
View article: Dislocation Density‐Mediated Functionality in Single‐Crystal BaTiO<sub>3</sub>
Dislocation Density‐Mediated Functionality in Single‐Crystal BaTiO<sub>3</sub> Open
Unlike metals where dislocations carry strain singularity but no charge, dislocations in oxide ceramics are characterized by both a strain field and a local charge with a compensating charge envelope. Oxide ceramics with their deliberate e…
View article: Harvesting room-temperature plasticity in ceramics by mechanically seeded dislocations
Harvesting room-temperature plasticity in ceramics by mechanically seeded dislocations Open
The quest for room-temperature ductile ceramics has been repeatedly fueled by hopes for large-scale applications but so far has been not successful. Recent demonstrations of enhanced functional properties in ceramics through judicious disl…
View article: Electric field response of ferroelectric domains near non-polar precipitates in BaTiO3-based ceramics
Electric field response of ferroelectric domains near non-polar precipitates in BaTiO3-based ceramics Open
Precipitates have recently been found to significantly enhance the mechanical quality factor in piezoelectric ceramics. Such a piezoelectric hardening effect was attributed to strong interactions between ferroelectric domains and precipita…
View article: Effect of temperature on dislocation-tuned dielectricity and piezoelectricity in single-crystal BaTiO3
Effect of temperature on dislocation-tuned dielectricity and piezoelectricity in single-crystal BaTiO3 Open
The pinning-controlled mobility of ferroelectric/ferroelastic domain walls is an important part of managing polarization switching and determining the final properties of ferroelectric and piezoelectric materials. Here, we assess the impac…
View article: Observation of dislocation-controlled domain nucleation and domain-wall pinning in single-crystal BaTiO3
Observation of dislocation-controlled domain nucleation and domain-wall pinning in single-crystal BaTiO3 Open
Electro-mechanical interactions between topological defects and domain walls play a key role in the macroscopic response of bulk and thin-film ferroelectrics. The applications of ferroelectrics are derived from their inherent ability to nu…
View article: The scientists’ responsibility in communicating the sustainability crisis
The scientists’ responsibility in communicating the sustainability crisis Open
Humankind and, in general, all life on earth, face a fundamental sustainability crisis. We have realized many decades ago that both our sources and our sinks on our planet are limited. International treaties have been adopted, panels have …
View article: The Fermi energy as common parameter to describe charge compensation mechanisms: A path to Fermi level engineering of oxide electroceramics
The Fermi energy as common parameter to describe charge compensation mechanisms: A path to Fermi level engineering of oxide electroceramics Open
Chemical substitution, which can be iso- or heterovalent, is the primary strategy to tailor material properties. There are various ways how a material can react to substitution. Isovalent substitution changes the density of states while he…
View article: Effect of thermal depolarization on the poling‐induced domain texture and piezoelectric properties in Mg‐doped NBT‐6BT
Effect of thermal depolarization on the poling‐induced domain texture and piezoelectric properties in Mg‐doped NBT‐6BT Open
Recently, poled Na 0.50 Bi 0.50 TiO 3 ‐BaTiO 3 (NBT‐BT)‐based polycrystalline materials have been characterized as possessing a high degree of poling‐induced domain texture in their remanent state. This finding is suggested to be the reaso…
View article: Intrinsic-Strain Engineering by Dislocation Imprint in Bulk Ferroelectrics
Intrinsic-Strain Engineering by Dislocation Imprint in Bulk Ferroelectrics Open
We report an intrinsic strain engineering, akin to thin filmlike approaches, via irreversible high-temperature plastic deformation of a tetragonal ferroelectric single-crystal BaTiO_{3}. Dislocations well-aligned along the [001] axis and a…
View article: Transitions from soft to hard piezoelectricity of (Ba, Ca)(Ti, Zr)O3 ceramics via precipitation hardening
Transitions from soft to hard piezoelectricity of (Ba, Ca)(Ti, Zr)O3 ceramics via precipitation hardening Open
Hard piezoelectrics are essential for high-power applications, the market share of which has increased significantly over the past few years. Acceptor-doping hardening, which relies on oxygen vacancies, has been proven to be a good practic…
View article: Fatigue-free dielectric and piezoelectric response in single-crystal BaTiO3 tuned by dislocation imprint
Fatigue-free dielectric and piezoelectric response in single-crystal BaTiO3 tuned by dislocation imprint Open
Dislocations have recently been imprinted into barium titanate single crystals to provide local domain wall pinning sites. Here, we assess the cycling stability under unipolar loading for the interaction between dislocations with [001] lin…
View article: Dislocation toughening in single‐crystal KNbO <sub>3</sub>
Dislocation toughening in single‐crystal KNbO <sub>3</sub> Open
The growing research interest in dislocation‐tuned functionality in ceramics is evident, with the most recent proofs‐of‐concept for enhanced ferroelectric properties, electrical conductivity, and superconductivity via dislocations. In this…