Microstructural effects on effective piezoelectric responses of textured PMN-PT ceramics

Chen, Ming; Yang, Tiannan; Luan, Kun; Chen, Lei; Wang, Liang; Zeng, Jian; Li, Yongxiang; Zhang, Wenqing; Chen, Lei

doi:10.1016/j.actamat.2017.11.043

Cited by 28 publications

(24 citation statements)

References 49 publications

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“…To fabricate ceramics with randomly distributed equi-axed pores the burned out polymer spheres (BURPS) process was used where the milled powders were mixed for 12h with ethanol with different weight fraction additions of a pore forming agent, polyethylene glycol (PEG) at weight fractions of 0, 3,5,9,13,16,20, and 23 wt.% based on the calcined powders. This was followed by mixing with 1 wt.% polyvinyl alcohol (PVA) binder to aid cold uniaxial pressing.…”

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

confidence: 99%

“…As a result, a thorough understanding of the influence of porosity on the properties of ferroelectric materials remains an important topic. To date, porosity in ferroelectric and piezoelectric materials has been considered at the micro-scale [7] and nano-scale levels [8], including bulk materials [9][10][11][12], textured materials [13], aerogels [14] and thin films [8,15].…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…When increasing the Zr 4+ addition (0.10 < y ≤ 0.15), BZT ceramics show a diffuse phase transition with a mixture of structural phases (rhombohedral, tetragonal and cubic) at room temperature. For Zr 4+ concentrations larger than y > 0.20, the Curie temperature (T C ) decreases below room temperature, accompanied by an increase of diffuseness of phase transition, thus indicating a mixed ferroelectric-relaxor behaviour [10]. For y > 0.25, a ferroelectric-relaxor crossover in BZT takes place [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, in the last decade, some authors deliberately introduced porosity in order to create composite materials with tailored properties for specific applications [2][3][4]. In ferroelectric and piezoelectric materials, porosity has been taken into consideration at the micro-and nanoscale [5,6] on bulk materials [7][8][9], textured materials [10], aerogels [11] and thin films [12]. One reason for the intentional introduction of porosity was to reduce the acoustic impedance of piezoelectric materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Porosity on Functional Properties of Lead-Free Piezoelectric BaZr0.15Ti0.85O3 Porous Ceramics

et al. 2020

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The present paper reports the dependence of dielectric, ferroelectric and piezoelectric properties on the porosity level in BaZr0.15Ti0.85O3 ceramics with porosity from 5% to 21%. Microporosity with 0–3 connectivity has been produced using PMMA microspheres as a sacrificial template. The functional properties (dielectric, ferroelectric and piezoelectric effect) are mostly affected by the “dilution effect”: permittivity decreases by 40% when porosity increases by 21%, and Pmax decreases from 13 to 5 µC/cm2 while the Prem is in the range of (2–8) µC/cm2. However, the reduction of the zero-field permittivity and hysteretic behaviour of ε(E) while the tunability level is still high makes from porous ceramics interesting materials for tunability application.

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“…Aleshin et al showed in simulations that decreasing the maximum misorientation angle from 20 to 2° increases d 33 by a factor of 3. Recently, Ming et al showed, using a phase field model, that the d 33 of textured Pb(Mg 1/3 Nb 2/3 )–PbTiO 3 (PMN–PT) ceramics with a textured volume fraction of 1 can be improved by a factor of 2 by decreasing r (decreasing misalignment between grains) from 0.2 to 0.1. These simulations underscore the importance of better grain alignment while maintaining high textured volume fraction in textured piezoelectric ceramics.…”

Section: Introductionmentioning

confidence: 99%

Tailoring particle alignment and grain orientation during tape casting and templated grain growth

et al. 2018

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The quality of crystallographic alignment in textured ceramics produced by tape casting and templated grain growth (TGG) has been little studied despite its demonstrated impact on magnetic, piezoelectric, and optical properties. Physical and crystallographic alignment of anisotropic template particles is shown to be directly linked to the casting rate, gap height, and casting viscosity during tape casting. These parameters are shown to affect the shape and magnitude of the shear rate profile under the doctor blade during casting which in turn causes a gradient in the torque acting on anisotropic particles. The magnitude of the torque, the time the slurry is exposed to torque during casting, and the ratio of casting height to template diameter are demonstrated to enable the particle alignment process to be tailored to produce well-aligned template particles. Crystallographic alignment of the textured ceramic was quantified by grain misalignment angle (full width at half maximum, FWHM) and degree of orientation (r) and is directly correlated with the degree of torque during casting. High-quality alignment (FWHM = 4.5°; r = 0.13) was demonstrated in the model TGG system consisting of submicrometer alumina and 5 vol% 11 μm diameter template platelet particles.

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Microstructural effects on effective piezoelectric responses of textured PMN-PT ceramics

Cited by 28 publications

References 49 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

Effect of Porosity on Functional Properties of Lead-Free Piezoelectric BaZr0.15Ti0.85O3 Porous Ceramics

Tailoring particle alignment and grain orientation during tape casting and templated grain growth

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