Acoustic Characterization of Poling Effects in PZT Ceramics

Abstract

Acoustic velocity and attenuation were measured in poled and unpoled lead zirconate titunate (PZT) ceramics prepared by sintering and hot-pressing under different conditions. Hot-pressed PZT was found to have attenuation vdues approximately I order of magnitude smaller than sintered PZT. For both materials, poling cliused a decrease in attenuation. Depolurization and phase transition phenomena were also observed at elevated temperatures using a novel laserultrasound technique in combination with conventional pulse-echo measurements.

Anomalous elastic moduli and internal frictions in unpoled and poled lead titanate zirconate ceramics near the Curie temperature

“…2(b) shows the susceptance curves above the Curie temperature. It can be seen that, compared with the acoustic method 14 in which the high-order echo is submerged by noise (Fig. 2 in Ref.…”

“…Dong et al 9 measured the elastic moduli and internal frictions of barium titanate ceramics over a wide temperature range and found that a negative Poisson's ratio appeared around 60 ○ C. Using the DMA and dielectric analyzer, the phase transitions in PZT and barium strontium titanate ceramics were also investigated by Wang et al 10,11 It should be noted that the commonly used free-free beam method and the DMA method are primarily limited to the measurement on isotropic materials, i.e., they are not applicable to poled materials although some scholars had employed them on poled PZT ceramics. 12,13 The Young's modulus and internal friction of poled PZT ceramics had been measured by the acoustic method, 14 and it was found that the Young's modulus of poled PZT is larger than that of the unpoled one. Based on this, Friend et al 15 employed the measured longitudinal wave velocity to determine the poling state of piezoelectric ceramics.…”

Ensuring Clinical Efficacy and Patient Safety With Repaired Ultrasound Probes

“…In addition, the attenuation for the acoustic stack was varied as 0.25 dB/cm‐MHz (lower attenuation for the acoustic stack), 0.75 dB/cm‐MHz (original attenuation for the acoustic stack), and 2.25 dB/cm‐MHz (higher attenuation for the acoustic stack). These values are typical for materials used in ultrasound probes . To simplify our simulations, the entire acoustic stack was assumed to have the same attenuation even though the attenuation of the different layers of the probe would vary dramatically.…”

“…These values are typical for materials used in ultrasound probes. 16,17 To simplify our simulations, the entire acoustic stack was assumed to have the same attenuation even though the attenuation of the different layers of the probe would vary dramatically.…”

Behavior of Current Flow on Lead Zirconate Titanate Surfaces during Mechanical Impact

“…This aspect is important and draws considerable interest to the application of PZT-materials for structural health monitoring. Moreover, it should be noted that the particle layer exhibits a low damping factor and high signal transmission properties [30] . The stress detection technique based on the correlation between current emission and dipole moment generation inside bulk ferroelectric PZT-specimen is the subject of this work.…”