Micro-structural, dielectric, ferroelectric and piezoelectric properties of mechanically processed (Pb1−xLax)(Zr0.60Ti0.40)O3 ceramics

Kumar, Ajeet; Raju, K. C. James; James, A. R.

doi:10.1007/s10854-018-9473-6

Cited by 14 publications

(6 citation statements)

References 38 publications

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“…where 𝜆, v, and f indicate the wavelength, velocity, and frequency of sound, respectively. In the near field, sound waves of low frequencies show a rapid pressure increase near the sound sources [48,49,57,60] lead-free inorganics, [35,52,53,55,56] and polymer. [50,51,54,58,59].…”

Section: Detection Distance Of F-pasmentioning

confidence: 99%

“…The corresponding equation in ideal condition is expressed as follows, ΔDist. ∝ 2 ΔSens.∕6 (60) where ΔDist. is the difference in distance, ΔSens.…”

Section: Detection Distance Of F-pasmentioning

confidence: 99%

“…Figure 9d shows the piezoelectric coefficients of reported piezoelectric materials such as Pb-based/Pb-free ceramics, and polymers. [35,[48][49][50][51][52][53][54][55][56][57][58][59][60] Inorganic ceramic materials show lower voltage constants than polymers because of its high permittivity, although the piezoelectric charge coefficients of piezoceramics are remarkably higher than polymers. However, the electromechanical coupling factor (conversion efficiency, k 33 ) should be also considered to design highly sensitive f-PAS, because previously reported polymer devices even with high g 33 generated lower output voltage compared to perovskite oxide-based devices.…”

Section: Detection Distance Of F-pasmentioning

confidence: 99%

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Theoretical Basis of Biomimetic Flexible Piezoelectric Acoustic Sensors for Future Customized Auditory Systems

Jung,

An,

Hyeon

et al. 2023

Adv Funct Materials

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Flexible piezoelectric sensors have been spotlighted as an essential human–machine interface (HMI) by obtaining high‐quality data from omnipresent biomechanical inputs. Because human voice is the most intuitive bio‐signal among them, flexible piezoelectric acoustic sensors (f‐PAS) have a potential to shift the paradigm of HMI technologies. Despite the reported outstanding performance such as high sensitivity and speaker recognition accuracy, the theoretical investigation of f‐PAS has been insufficient to realize future customized development, because sensing principles are fundamentally different from commercialized microphones. Here, a theoretical framework of self‐powered f‐PAS by using mechanical and electrical physics is introduced. First of all, the basic theory of f‐PAS is compared with the auditory system of human cochlear. Based on the biomimetic trapezoidal shape, the resonant frequencies are analyzed with various structural and material conditions. In addition, the piezoelectricity of f‐PAS is derived to predict the sensitivity and SNR prior to experiments. To investigate sensor properties under the medium condition that is similar to human ear, the acoustic responses depending on the states of matter are theoretically compared. Finally, the distance limit of f‐PAS is studied with the correlations between piezoelectricity and sound pressure, which would provide novel strategies of functional material design for future applications of f‐PAS.

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Section: Detection Distance Of F-pasmentioning

confidence: 99%

“…The corresponding equation in ideal condition is expressed as follows, ΔDist. ∝ 2 ΔSens.∕6 (60) where ΔDist. is the difference in distance, ΔSens.…”

Section: Detection Distance Of F-pasmentioning

confidence: 99%

Section: Detection Distance Of F-pasmentioning

confidence: 99%

See 1 more Smart Citation

Theoretical Basis of Biomimetic Flexible Piezoelectric Acoustic Sensors for Future Customized Auditory Systems

Jung,

An,

Hyeon

et al. 2023

Adv Funct Materials

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“…Clear and visible grain boundaries, uniformity in grain sizes, and lack of porosity in the PLZT materials may be the reasons for the good properties exhibited. It was deemed that minute chemical inhomogeneities on the A-and B-sites of the perovskite and formation of secondary phases on a very small scale at the grain boundaries prevented the growth of grains [37].…”

Section: Phase Analysis and Microstructural Characterizationmentioning

confidence: 99%

“…Figure 1b shows the newly proposed phase diagram of PZT ceramics. La substitution into PZT ceramics also modifies the MPB, and the influence of La doping on the MPB of PZT ceramics was studied and reported by many researchers [10,16,[31][32][33][34][35][36][37][38]. As per the phase diagram, PLZT 8/60/40 ceramics lie close to the MPB and were selected for further studies [7].…”

Section: Introductionmentioning

confidence: 99%

Development of PLZT Electroceramics with Ultrahigh Piezoelectric Properties by a Novel Material Engineering Approach

James¹,

Kumar²

2019

Handbook of Advanced Ceramics and Composites

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Lead lanthanum zirconium titanate (PLZT) ceramics belong to the family of materials known as smart materials, which can be used as sensors and actuators; however, the high dielectric, ferroelectric (P r ), and piezoelectric (d 33 and g 33 ) properties decide the end applications. The d 33 is related to charge generation or electric field-induced strain in the materials. On the other hand, g 33 and k p are related to the voltage generation and conversion of mechanical stress to the electric charge, respectively. High values of d 33 , g 33 , and k p are good for energy harvesting applications; however, the high-strain materials are more useful for actuators. The remanent polarization (P r ) and coercive field (E c ) are taken into cognizance for memory and energy density applications. High dielectric constant materials can be used for charge storage applications. (Pb 0.92 La 0.08 )(Zr 0.60 Ti 0.40 ) O 3 (PLZT 8/60/40) ceramics are known to show all of the above electrical properties. Further improvement of these properties is possible by modified processing approaches. In this study, it was found that a combination of mechanical activation (high-energy milling or HEM) with a cold isostatic process (CIP) not only reduces the processing temperatures and time but also circumvents the need to add any excess PbO in the starting materials. At the same time, the high density of ceramics was not compromised. No binder was added in this process, thereby avoiding the contamination risk involved and also the possibility of reduced density. Apart from the above two processes, yet another process that was used to improve the electrical properties output was a scientific study of the electrical poling process. The optimized poling results in the significant enhancement of electrical properties, which successfully increased piezoelectric properties multiple times. The PLZT 8/60/40 ceramics were effectively poled at fields less than the coercive field (<0.5E c ), which could be very advantageous especially in the case of ceramics have poor resistivity. Such PLZT ceramics is used for different types of defense applications.

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Development of PLZT Electroceramics with Ultrahigh Piezoelectric Properties by a Novel Material Engineering Approach

James¹,

Kumar²

2020

Handbook of Advanced Ceramics and Composites

View full text Add to dashboard Cite

Micro-structural, dielectric, ferroelectric and piezoelectric properties of mechanically processed (Pb1−xLax)(Zr0.60Ti0.40)O3 ceramics

Cited by 14 publications

References 38 publications

Theoretical Basis of Biomimetic Flexible Piezoelectric Acoustic Sensors for Future Customized Auditory Systems

Theoretical Basis of Biomimetic Flexible Piezoelectric Acoustic Sensors for Future Customized Auditory Systems

Development of PLZT Electroceramics with Ultrahigh Piezoelectric Properties by a Novel Material Engineering Approach

Development of PLZT Electroceramics with Ultrahigh Piezoelectric Properties by a Novel Material Engineering Approach

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