New methodology for determining the dielectric constant of a piezoelectric material at the resonance frequency range

Daneshpajooh, Hossein; Shekhani, Husain N.; Choi, Munkee; Uchino, Kenji

doi:10.1111/jace.15338

Cited by 9 publications

(6 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To improve the permittivity, people have been incorporating high dielectric constant inorganic materials or conducting materials in polymer matrices, such as ferroelectric materials, semiconductors, metals, and carbon nanomaterials. − Among those additives, the ferroelectric materials, with spontaneous electric polarization, which can be reversed by external electric field, have captured broad interests because of their high dielectric constants. − To date, the majority of the commercial ferroelectrics are inorganic perovskite oxides, such as barium titanate and lead zirconate titanate. , However, these materials contain heavy-metal elements and require costly thermal and vacuum processing during preparation . In addition, the large loading of fillers may cause aggregation, structural defects, and reduction of transparency and flexibility of the polymer composites materials, which will reduce the optical and mechanical performance of those composite polymer materials .…”

mentioning

confidence: 99%

Flexible and Transparent High-Dielectric-Constant Polymer Films Based on Molecular Ferroelectric-Modified Poly(Vinyl Alcohol)

Yang

Zhao

Liu

et al. 2020

ACS Materials Lett.

View full text Add to dashboard Cite

Organic ferroelectrics with high dielectric constant have received substantial attention for sustainable and flexible energy storage. Here, we report a high-κ dielectric, optically transparent, mechanically strong and flexible dielectric polymer produced by in situ formation of biaxial ferroelectric-molecule-modified poly(vinyl alcohol) (PVA). The composite film was fabricated by solution casting of a PVA solution containing water-soluble dielectric crystals [Hdabco]ClO 4 . Atomic force microscopic and polarized optical microscopic studies showed a uniform dispersion of TEDA.C crystals with tunable rod-like or dendritic microstructures in the PVA matrix. Because of the good compatibility and hydrogen bonds between PVA and TDEA.C, the modified PVA films presented a significant enhancement of the dielectric constant and energy storage density by 10−100-fold over neat PVA. The polarization-electric loops indicated that the PVA composite films possessed increased saturation polarization in comparison to neat PVA film. The remnant polarization of PVA composite films was improved by around 3200 times with 9 wt % TEDA.C. Also, the TEDA.C@PVA films exhibited 85% transparency throughout the visible spectrum, 116% increase in storage modulus, and 274% elongation at fracture. These unprecedented high-κ dielectric, optical, and mechanical properties may break the restrictions in the applications of traditional ferroelectric materials and greatly expand the usage of dielectric polymers in broad fields.

show abstract

mentioning

confidence: 99%

Flexible and Transparent High-Dielectric-Constant Polymer Films Based on Molecular Ferroelectric-Modified Poly(Vinyl Alcohol)

Yang

Zhao

Liu

et al. 2020

ACS Materials Lett.

View full text Add to dashboard Cite

show abstract

“…First, the dielectric properties can be obtained at an off-resonance frequency, since it is proven to be similar to the ones near resonance frequency [8]. The intensive dielectric permittivity and corresponding loss values along 33-direction and 11-direction can be obtained from the standard k 31 and k 15 mode geometries.…”

Section: Off-resonant Capacitance Measurementmentioning

confidence: 99%

Determination of anisotropic intensive piezoelectric loss in polycrystalline ceramics

Choi

Park

Daneshpajooh

et al. 2021

Ceramics International

Self Cite

View full text Add to dashboard Cite

“…e 0 e X 33 1 À k We improved the above methodology further to measure the 'dielectric loss', in addition to the permittivity, of a piezoelectric at the resonance frequency range based on the burst excitation method [21]. Daneshpajooh et al investigated the 'force' and 'voltage' factors under the short-and open-circuit conditions of the burst method, in terms of the ratio of the ring-down current and voltage with the plate end vibration velocity and the displacement, and their phase lags.…”

Section: Piezoelectric Parameter Determination Proceduresmentioning

confidence: 99%

High power piezoelectric characterization system (HiPoCS™)

Uchino

2020

Ferroelectrics

Self Cite

View full text Add to dashboard Cite

The bottleneck of the piezoelectric devices in miniaturization is the heat generation owing to the losses. There are three losses in a piezoelectric material; dielectric, elastic and piezoelectric losses. The development of high-power density piezoelectrics is directly relevant to the clarification of the loss mechanisms in such materials. This article describes the characterization methodologies of high-power piezoelectrics, in particular, in determining the three losses separately. There are two categories for the measuring methods: (1) electrical excitation method, and (2) mechanical excitation method. The former is basically admittance/impedance measurement via the output current over the input voltage, further classified into four methods; (a) constant voltage, (b) constant current, (c) constant vibration velocity, and (d) constant input energy. To the contrary, the latter is basically the transient mechanical vibration ring-down measurement under various electrical constraint conditions. The key is to obtain precise values of both mechanical quality factors at resonance Q A and at antiresonance Q B , regardless of measuring techniques, so that we can determine the piezoelectric loss precisely. The difference of Q M between the resonance and antiresonance is originated from the electromechanical coupling factor k 2 loss, k 2 00 k 2 0 ¼ ð2 tan h 0 À tan d 0 À tan / 0 Þ: Depending on the sign of the k 2 loss, more efficient driving frequency can be derived rather than the conventional 'resonance' frequency.

show abstract

New methodology for determining the dielectric constant of a piezoelectric material at the resonance frequency range

Cited by 9 publications

References 26 publications

Flexible and Transparent High-Dielectric-Constant Polymer Films Based on Molecular Ferroelectric-Modified Poly(Vinyl Alcohol)

Flexible and Transparent High-Dielectric-Constant Polymer Films Based on Molecular Ferroelectric-Modified Poly(Vinyl Alcohol)

Determination of anisotropic intensive piezoelectric loss in polycrystalline ceramics

High power piezoelectric characterization system (HiPoCS™)

Contact Info

Product

Resources

About