A comparative study of hard/soft PZT-based ceramic composites

“…PZT materials depend on the organization of precursor elements into the desired perovskite structure [20]. The perovskite structure can be doped with additional elements to boost the percentage of this structure or influence the properties of the material for better performance [21]. The perovskite structure is organized into larger bulk transduction materials that are integrated into patches of two different structures: thin-film or macro-fiber composite (MFC).…”

Section: Piezoelectric Energy Harvester Methodsmentioning

confidence: 99%

Role of Electromechanical Coupling, Locomotion Type and Damping on the Effectiveness of Fish-Like Robot Energy Harvesters

2021

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In this work, an investigation into the influence of prescribed motion on a body caudal fin aquatic unmanned vehicle (AUV) energy harvester is carried out. The undulatory–oscillation locomotion inspired by fishes actuates a composite beam representative of a spinal column with a piezoelectric patch. Two patch configurations—one at the head and tail—are considered for the AUV energy harvester, with a length that would not activate a harmonic in the system. An electromechanical model which accounts for the strain of the prescribed motion and the induced relative strain is developed. Discretizing the relative strain using Galerkin’s method requires a convergence study in which the impacts of the prescribed motion, dependent on the undulation and envelope of the motion, are investigated. The combination of prescribed motion and structural terms leads to a coupling that requires multiple investigations. The removal of the undulation of the system produces a more consistent response. The performances of the two different patch configurations undergoing different prescribed motions are studied in terms of coupled damping and frequency effects. An uncoupled Gauss law-based model is adopted to compare the performance of our approach and that of the coupled electromechanical model harvester. It is demonstrated that there is a complex interaction of the phases of the prescribed and relative motions of the structure which can lead to the development or destruction of the response of the total motion or voltage for the system. The results show that the structural damping and type of locomotion are the most influential parameters on the validity of the uncoupled approach. It is also found that the optimal resistances for the coupled and uncoupled representations are the same for the two motions and patch configurations considered.

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“…Related perovskite tiny compositional deviations would have a significant effect in properties only if they result in materials leaving the morphotropic phase boundary (MPB), which does not seem to be the case. Actually, the splitting of the perovskite cubic 200 peak into three peaks between 42.5 and 46.6 • indicates the coexistence of tetragonal (T) and rhombohedral (R) phases and thus, that the PZT phase was consistently within the MPB region [47][48][49][50]. As said, this is required for high piezoelectric response.…”

Section: Microstructurementioning

confidence: 98%

A Glance at Processing-Microstructure-Property Relationships for Magnetoelectric Particulate PZT-CFO Composites

et al. 2020

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In this work, we investigated the processing-microstructure-property relationships for magnetoelectric (ME) particulate composites consisting of hard ferromagnetic CoFe2O4 (CFO) particles dispersed in a Nb-doped PbZrxTi1-xO3 (PZT) soft ferroelectric matrix. Several preparation steps, namely PZT powder calcination, PZT-CFO mixture milling and composite sintering were tailored and a range of microstructures was obtained. These included open and closed porosities up to full densification, PZT matrices with decreasing grain size across the submicron range down to the nanoscale and well dispersed CFO particles with bimodal size distributions consisting of submicron and micron sized components with varying weights. All samples could be poled under a fixed DC electric field of 4 kV/mm and the dielectric, piezoelectric and elastic coefficients were obtained and are discussed in relation to the microstructure. Remarkably, materials with nanostructured PZT matrices and open porosity showed piezoelectric charge coefficients comparable with fully dense composites with coarsened microstructure and larger voltage coefficients. Besides, the piezoelectric response of dense materials increased with the size of the CFO particles. This suggests a role of the conductive magnetic inclusions in promoting poling. Magnetoelectric coefficients were obtained and are discussed in relation to densification, piezoelectric matrix microstructure and particle size of the magnetic component. The largest magnetoelectric coefficient α33 of 1.37 mV cm−1 Oe−1 was obtained for submicron sized CFO particles, when closed porosity was reached, even if PZT grain size remained in the nanoscale.

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A comparative study of hard/soft PZT-based ceramic composites

Cited by 38 publications

References 22 publications

Use of the time constant related parameter f_max to calculate the activation energy of bulk conduction in ferroelectrics

Use of the time constant related parameter f_max to calculate the activation energy of bulk conduction in ferroelectrics

Role of Electromechanical Coupling, Locomotion Type and Damping on the Effectiveness of Fish-Like Robot Energy Harvesters

A Glance at Processing-Microstructure-Property Relationships for Magnetoelectric Particulate PZT-CFO Composites

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A comparative study of hard/soft PZT-based ceramic composites

Cited by 38 publications

References 22 publications

Use of the time constant related parameter fmax to calculate the activation energy of bulk conduction in ferroelectrics

Use of the time constant related parameter fmax to calculate the activation energy of bulk conduction in ferroelectrics

Role of Electromechanical Coupling, Locomotion Type and Damping on the Effectiveness of Fish-Like Robot Energy Harvesters

A Glance at Processing-Microstructure-Property Relationships for Magnetoelectric Particulate PZT-CFO Composites

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Product

Resources

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Use of the time constant related parameter f_max to calculate the activation energy of bulk conduction in ferroelectrics

Use of the time constant related parameter f_max to calculate the activation energy of bulk conduction in ferroelectrics