Electro-mechanical behaviour of ferroelectrics: Insights into local contributions from macroscopic measurements

Segouin, Valentin; Domenjoud, Mathieu; Bernard, Yves; Daniel, Laurent

doi:10.1016/j.actamat.2021.116870

Cited by 7 publications

(6 citation statements)

References 61 publications

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“…This phenomenon stabilizes the domain configuration and experimentally manifests itself as an internal bias field. Notably, in Fe‐doped KNN ceramics, the S–E curves exhibit more pronounced electrostriction, inclining toward a ferroelastic response 104,105 . This inferior piezo‐response is consistent with observations in literature (for KNTN‐Fe) 61,106 …”

Section: Resultssupporting

confidence: 91%

“…Notably, in Fe-doped KNN ceramics, the S-E curves exhibit more pronounced electrostriction, inclining toward a ferroelastic response. 104,105 This inferior piezo-response is consistent with observations in literature (for KNTN-Fe). 61,106 The strategies currently adopted to induce hardening in the KNN-based material mainly focus on the role of (isolated-) oxygen vacancy formation.…”

Section: Ferroelectric Propertiessupporting

confidence: 92%

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Effect of iron acceptor doping and calcium donor doping in potassium sodium niobate‐based lead‐free piezoceramics

Azadeh,

Zhao,

Pawadi

et al. 2024

J Am Ceram Soc.

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Lead‐free potassium sodium niobate (KNN) ferroelectrics have emerged as promising alternatives to lead‐based materials due to their reduced toxicity and sometimes enhanced properties. The opportunity to modify the ferroelectric properties by doping, nevertheless, differs from lead‐based ceramics. A much lower impact with increasing dopant concentration was observed. This study systematically investigates the differences in defect chemistry of Na0.475K0.475Li0.065Nb0.92Ta0.08O3 ceramics through iron (Fe) acceptor doping and calcium (Ca) donor doping at varying concentrations. From the defect chemical point of view, it becomes evident that the impact of intrinsic defects on the electrical properties exceeds the effect of extrinsic defects induced by doping. The performance of the donor‐doped (Ca2+) ceramics closely resembles that of undoped KNN. Thus, hardly any change in ferroelectric properties and conductivity is observed. For the Fe‐doped samples, the conductivity and its contribution to the dielectric loss increased, which is not to the benefit of an application as a ferroelectric. Therefore, the concepts of “softening” and “hardening” of ferroelectric properties by doping are incompatible with regularly sintered KNN ceramics.

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Section: Resultssupporting

confidence: 91%

Section: Ferroelectric Propertiessupporting

confidence: 92%

Effect of iron acceptor doping and calcium donor doping in potassium sodium niobate‐based lead‐free piezoceramics

Azadeh,

Zhao,

Pawadi

et al. 2024

J Am Ceram Soc.

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“…The test bench is specifically designed for the application of an uniaxial electromechanical loading along the direction 3, as illustrated in figure 1 [38], allowing the application of an [38]. Reproduced from [38]. CC BY 4.0. electric field up to 4 kV mm −1 and a compressive mechanical stress up to 100 MPa.…”

Section: Methodsmentioning

confidence: 99%

“…The only requirement is that the surface of the sample contains optical trackers (namely, a speckle pattern) so that displacements can be extracted by the DIC program. The speckle can be natural [36,37] or painted [35,38].…”

Section: Introductionmentioning

confidence: 99%

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Anhysteretic strains in ferroelectric ceramics under electromechanical loading

Babori,

Barati,

Segouin

et al. 2024

J. Phys. D: Appl. Phys.

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This study investigates anhysteretic strains in PZT ceramics. The anhysteretic curves are associated with a stable balanced state of polarisation in the domain structure, excluding dissipative effects associated with mechanisms such as domain wall pinning. Anhysteretic measurements are representative of a -ideal- scenario in which the material would undergo no energy loss due to dissipative processes, focusing on the stable and reversible aspects of the domain configuration. The different methodologies employed to measure deformations under electromechanical loading are presented, leading to the introduction of digital image correlation (DIC) as the chosen technique, recognised for its ability to capture detailed information on transverse and longitudinal strain. The article then describes a comprehensive procedure developed to obtain anhysteretic curves. The subsequent presentation of the results of the transverse and longitudinal strain analyses provides valuable insights into the reversible and irreversible behaviour of the material. They can be used as a basis for the thermodynamical modelling approaches grounded on the separation of reversible and irreversible contributions.

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Investigation of self-heating and dissipative effects in ferroelectric ceramics subjected to compressive mechanical cyclic loading

et al. 2021

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Electro-mechanical behaviour of ferroelectrics: Insights into local contributions from macroscopic measurements

Cited by 7 publications

References 61 publications

Effect of iron acceptor doping and calcium donor doping in potassium sodium niobate‐based lead‐free piezoceramics

Effect of iron acceptor doping and calcium donor doping in potassium sodium niobate‐based lead‐free piezoceramics

Anhysteretic strains in ferroelectric ceramics under electromechanical loading

Investigation of self-heating and dissipative effects in ferroelectric ceramics subjected to compressive mechanical cyclic loading

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