Efficiency of excitation of piezoceramic transducers at antiresonance frequency

Mezheritsky, A.V.

doi:10.1109/58.996567

Cited by 29 publications

(17 citation statements)

References 12 publications

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“…Besides, a higher quality factor at the antiresonance is usually observed in the PZT based piezoelectric materials, in comparison with the resonance quality factor [12][13][14]. However, the previous theory without considering the piezoelectric loss factor could not explain the deviation of the resonance quality factor Q A and antiresonance quality factor Q B explicitly.…”

Section: Introductionmentioning

confidence: 84%

Methodology for Characterizing Loss Factors of Piezoelectric Ceramics

2014

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The methodology to obtain the loss factors in piezoelectric ceramics is proposed in this paper. There are three hysteresis loss components for piezoelectric vibrators, i.e., dielectric, elastic and piezoelectric losses. The equations were derived about the relations between mechanical quality factors and all contributing loss factors by the complex analysis of the admittance/impedance expressions for specific piezoelectric vibrators. By characterizing mechanical quality factors and coupling coefficients in k 31 , k t , k 33 , k p , and k 15 modes, 20 loss factors can be obtained for the piezoelectric ceramic with ∞mm or 6 mm crystal symmetry.

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Section: Introductionmentioning

confidence: 84%

Methodology for Characterizing Loss Factors of Piezoelectric Ceramics

2014

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“…Mechanical loss factors are related with the quality factor (figure 4). Mechanical loss factor is the inverse of quality factor during resonance [32,33].…”

Section: E/m Impedance/admittance Modeling Of Free Pwas Transducermentioning

confidence: 99%

Irreversibility effects in piezoelectric wafer active sensors after exposure to high temperature

Haider

Giurgiutiu

Lin

et al. 2017

Smart Mater. Struct.

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This paper presents an experimental and analytical study of irreversible change in piezoelectric wafer active sensor (PWAS) electromechanical (E/M) impedance and admittance signature under high temperature exposure. After elevated to high temperatures, change in the material properties of PWAS can be quantified through irreversible changes in its E/M impedance and admittance signature. For the experimental study, circular PWAS transducers were exposed to temperatures between 50°C and 250°C at 50°C intervals. E/M impedance and admittance data were obtained before and after each heating cycle. Irreversible temperature sensitivity of PWAS resonance and anti-resonance frequency was estimated as 0.0246 kHz°C −1 and 0.0327 kHz°C −1 respectively. PWAS transducer material properties relevant to impedance or admittance signature such as dielectric constant, dielectric loss factor, mechanical loss factor, and in plane piezoelectric constant were determined experimentally at room temperature before and after the elevated temperature tests. The in-plane piezoelectric coefficient was measured by using optical-fiber strain transducer system. It was found that the dielectric constant and in-plane piezoelectric coefficient increased linearly with temperature. Dielectric loss also increases with temperature but remains within 0.2% of initial room temperature value. Change in dielectric properties and piezoelectric constant may be explained by depinning of domains or by domain wall motion. The piezoelectric material degradation was investigated microstructurally and crystallographically by using scanning electron microscope and x-ray diffraction method respectively. There were no noticeable changes in microstructure, crystal structure, unit cell dimension, or symmetry. The degraded PWAS material properties were determined by matching impedance and admittance spectrums from experimental results with a closed form circular PWAS analytical model. Analytical results showed that impedance and admittance strongly depend on elastic coefficient, dielectric constant, mechanical loss factor, dielectric loss tangent and in plane piezoelectric constant. These properties were found to be susceptible to change after high temperature exposure.

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“…3,

Q_{r} = \frac{f_{r}}{normalΔ f_{r}},

Q_{a} = \frac{f_{a}}{normalΔ f_{a}}

where f r and f a are the resonance and antiresonance frequencies of the resonator, respectively, Δ f r and Δ f a are the corresponding 3 dB bandwidths. People usually use Q r as the parameter for energy loss in piezoelectric materials, the importance of Q a has also been demonstrated [65–67]. Moreover, it was reported that the calculated values of Q r and Q a using Eq.…”

Section: Theories On Energy Lossesmentioning

confidence: 99%

Losses in ferroelectric materials

Liu

Zhang

Jiang

et al. 2015

Materials Science and Engineering: R: Reports

265

112

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Ferroelectric materials are the best dielectric and piezoelectric materials known today. Since the discovery of barium titanate in the 1940s, lead zirconate titanate ceramics in the 1950s and relaxor-PT single crystals (such as lead magnesium niobate-lead titanate and lead zinc niobate-lead titanate) in the 1980s and 1990s, perovskite ferroelectric materials have been the dominating piezoelectric materials for electromechanical devices, and are widely used in sensors, actuators and ultrasonic transducers. Energy losses (or energy dissipation) in ferroelectrics are one of the most critical issues for high power devices, such as therapeutic ultrasonic transducers, large displacement actuators, SONAR projectors, and high frequency medical imaging transducers. The losses of ferroelectric materials have three distinct types, i.e., elastic, piezoelectric and dielectric losses. People have been investigating the mechanisms of these losses and are trying hard to control and minimize them so as to reduce performance degradation in electromechanical devices. There are impressive progresses made in the past several decades on this topic, but some confusions still exist. Therefore, a systematic review to define related concepts and clear up confusions is urgently in need. With this objective in mind, we provide here a comprehensive review on the energy losses in ferroelectrics, including related mechanisms, characterization techniques and collections of published data on many ferroelectric materials to provide a useful resource for interested scientists and engineers to design electromechanical devices and to gain a global perspective on the complex physical phenomena involved. More importantly, based on the analysis of available information, we proposed a general theoretical model to describe the inherent relationships among elastic, dielectric, piezoelectric and mechanical losses. For multi-domain ferroelectric single crystals and ceramics, intrinsic and extrinsic energy loss mechanisms are discussed in terms of compositions, crystal structures, temperature, domain configurations, domain sizes and grain boundaries. The intrinsic and extrinsic contributions to the total energy dissipation are quantified. In domain engineered ferroelectric single crystals and ceramics, polarization rotations, domain wall motions and mechanical wave scatterings at grain boundaries are believed to control the mechanical quality factors of piezoelectric resonators. We show that a thorough understanding on the kinetic processes is critical in analyzing energy loss behavior and other time-dependent properties in ferroelectric materials. At the end of the review, existing challenges in the study and control of losses in ferroelectric materials are analyzed, and future perspective in resolving these issues is discussed.

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Efficiency of excitation of piezoceramic transducers at antiresonance frequency

Cited by 29 publications

References 12 publications

Methodology for Characterizing Loss Factors of Piezoelectric Ceramics

Methodology for Characterizing Loss Factors of Piezoelectric Ceramics

Irreversibility effects in piezoelectric wafer active sensors after exposure to high temperature

Losses in ferroelectric materials

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