Enhanced pyroelectric and piezoelectric properties of PZT with aligned porosity for energy harvesting applications

Zhang, Yan; Xie, Mengying; Roscow, James; Bao, Yinxiang; Zhou, Kechao; Zhang, Dou; Bowen, Chris R.

doi:10.1039/c7ta00967d

Cited by 198 publications

(144 citation statements)

References 43 publications

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“…To generate aligned porosity, freeze casting was carried out by pouring water-based BCZT suspensions with different levels of BCZT solid loading levels into a transparent cylindrical polydimethylsiloxane (PDMS) mould and subjecting the mixture to unidirectional freezing. This was followed by a freeze drying process reported in our previous studies [7,[39][40][41] to remove the ice crystals and produce aligned BCZT powder sample. Water was utilised as the solvent to disperse the ceramic for freeze casting, which has been widely explored to obtain long-range ordered anisotropic aligned pore channels [42].…”

Section: Manufacture and Characterisation Of Equi-axed And Aligned Pomentioning

confidence: 99%

“…The increased tilting of the polarisation-field loops with increasing pore volume fraction in Figure 2(A) and reduced rectangularity at porosity fractions over 25% in Figure 2(C) is indicative of domain switching occurring over a wider range of electric field levels in the higher porosity materials, compared to the more dense materials. hydroxyapatite [41], PZT [7], and hydroxyapatite/barium titanate composite [19]. As an example, the microstructure of the porous freeze-cast BCZT with a porosity volume fraction of 40 vol.% is shown in Figure 3(A), where the arrow indicates the freezing direction, along which the pore channels and ceramic are aligned.…”

Section: (B) a Decrease Inmentioning

confidence: 99%

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Understanding the effect of porosity on the polarisation-field response of ferroelectric materials

et al. 2018

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This paper combines experimental and modelling studies to provide a detailed examination of the influence of porosity volume fraction and morphology on the polarisation-electric field response of ferroelectric materials.The broadening of the electric field distribution and a decrease in the electric field experienced by the ferroelectric ceramic medium due to the presence of low-permittivity pores is examined and its implications on the shape of the hysteresis loop, remnant polarisation and coercive field is discussed. The variation of coercive field with porosity level is seen to be complex and is attributed to two competing mechanisms where at high porosity levels the influence of the broadening of the electric field distribution dominates, while at low porosity levels an increase in the compliance of the matrix is more important. This new approach to understanding these materials enables the seemingly conflicting observations in the existing literature to be clarified and provides an effective approach to interpret the influence of pore fraction and morphology on the polarisation behaviour of ferroelectrics. A new general rule to describe the relationship between the polarisation and porosity is also proposed. Such information provides new insights in the interpretation of the physical properties of porous ferroelectric materials to inform future effort in the design of ferroelectric materials for piezoelectric sensor, actuator, energy harvesting, and transducer applications.

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Section: Manufacture and Characterisation Of Equi-axed And Aligned Pomentioning

confidence: 99%

Section: (B) a Decrease Inmentioning

confidence: 99%

Understanding the effect of porosity on the polarisation-field response of ferroelectric materials

et al. 2018

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“…have reported the preparation of porous PZT ceramic from commercial PZT particles (3 μm) to study its effect on piezoelectric and pyroelectric energy harvesting. They found an increase in energy output in case of porous PZT compared to the dense PZT system due to the reduced permittivity and volume specific heat capacity . Babu and With have used PZT particles with PDMS matrix to develop flexible composite with excellent piezoelectric properties .…”

Section: Introductionmentioning

confidence: 99%

Polydimethylsiloxane–PbZr_0.52Ti_0.48O₃ nanocomposites with high permittivity: Effect of poling and temperature on dielectric properties

Nayak

Khastgir

2018

J of Applied Polymer Sci

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Polydimethylsiloxane (PDMS)/lead zirconate titanate (PbZr0.52Ti0.48O3, PZT)‐based nanocomposites with high dielectric constant (permittivity, k) are prepared through room temperature mixing. The effect of PZT loading on electrical and mechanical properties of the PDMS–PZT composites is extensively studied. It is found that there is significant increase in permittivity with PZT loading and decrease in volume resistivity. All the composites have low dielectric loss compared to permittivity value. It is observed that there is increase in permittivity and decrease in volume resistivity of composites after poling, which is due to the dipolar polarization. It is found that both permittivity (ε′) and alternating current conductivity (σac) are increased with temperature at low frequency (1 Hz) and decreased with temperature at high frequency (1 MHz). The above composites are sensitive to external pressure and can be used as pressure/force sensor. The tensile strength and % elongation at break decreases with PZT loading, which is due to the nonreinforcing behavior of PZT ceramic. PZT particles distribution and dispersion in PDMS matrix are observed through field emission scanning electron microscopy, high resolution transmission electron microscopy, and atomic force microscopy/scanning probe microscopy. Thermal stability of composites increased with the PZT loading which is due to higher thermal stability of PZT particles compared to PDMS matrix. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47307.

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“…[60,61,64] It is known that the microstructure of the films impacts the macroscopically effective piezo-as well as the pyroelectric responses. [65,66] With the significantly lower density and the fine-grained microstructure, it can be argued that the film is rather porous resulting in the lower endurance and breakdown fields compared with the ALD films. Therefore, a careful study of the impact of the microstructure and a subsequent optimization are proposed as subjects of future work.…”

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Toward Thick Piezoelectric HfO₂‐Based Films

Schenk

Godard

Mahjoub

et al. 2019

Physica Rapid Research Ltrs

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For HfO2‐based films, which are mainly prepared by atomic layer deposition, the desired ferroelectric (FE) properties typically vanish while extending the thickness beyond a limit of about 50 nm. Herein, the successful fabrication of a 1 μm‐thick piezoelectric La:HfO2 film is demonstrated using chemical solution deposition, paving the way toward sensor and actuator applications. After identifying the optimal La content, the film thickness is increased from 45 nm to 1 μm. Polarization and strain measurements evidence the persistence of the FE properties at all thicknesses and even a slight improvement due to a better orientation of the polar axis at higher thicknesses. Scanning electron microscopy and X‐ray reflectivity reveal a fine‐grained microstructure and a density of only 80% of the theoretical value, which seems to be a common issue of solution‐deposited HfO2‐based films, based on the performed literature survey. Using tilt‐angle‐dependent X‐ray diffraction scans, homogeneous nucleation is found to be the likely root cause of the observed microstructure. It is suggested that this microstructure issue is key for the optimization of cycling stability of solution‐based films to exploit the full potential of the HfO2 for cost‐efficient, thick piezoelectric films.

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Enhanced pyroelectric and piezoelectric properties of PZT with aligned porosity for energy harvesting applications

Abstract: This paper demonstrates the significant benefits of exploiting highly aligned porosity in piezoelectric and pyroelectric materials for improved energy harvesting performance.

Cited by 198 publications

References 43 publications

Understanding the effect of porosity on the polarisation-field response of ferroelectric materials

Understanding the effect of porosity on the polarisation-field response of ferroelectric materials

Polydimethylsiloxane–PbZr_0.52Ti_0.48O₃ nanocomposites with high permittivity: Effect of poling and temperature on dielectric properties

Toward Thick Piezoelectric HfO₂‐Based Films

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Enhanced pyroelectric and piezoelectric properties of PZT with aligned porosity for energy harvesting applications

Abstract: This paper demonstrates the significant benefits of exploiting highly aligned porosity in piezoelectric and pyroelectric materials for improved energy harvesting performance.

Cited by 198 publications

References 43 publications

Understanding the effect of porosity on the polarisation-field response of ferroelectric materials

Understanding the effect of porosity on the polarisation-field response of ferroelectric materials

Polydimethylsiloxane–PbZr0.52Ti0.48O3 nanocomposites with high permittivity: Effect of poling and temperature on dielectric properties

Toward Thick Piezoelectric HfO2‐Based Films

Contact Info

Product

Resources

About

Polydimethylsiloxane–PbZr_0.52Ti_0.48O₃ nanocomposites with high permittivity: Effect of poling and temperature on dielectric properties

Toward Thick Piezoelectric HfO₂‐Based Films