Electro-mechanical properties of free standing micro- and nano-scale polymer-ceramic composites for energy density capacitors

Singh, Paritosh; Borkar, Hitesh; Singh, Bhanu Pratap; Singh, V.N.

doi:10.1016/j.jallcom.2015.06.272

Cited by 20 publications

(5 citation statements)

References 41 publications

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“…The suitable frequencies for bulk PE loops study are in the range of 1-10 Hz. [50][51][52][53]. A well-saturated polarization hysteresis loops for 100 Hz applied frequency are observed and compared with 20 Hz probe frequency.…”

Section: Field Dependent Polarizationmentioning

confidence: 92%

Effect of temperature and humidity on dielectric and impedance properties of K(Nb_0.8Ta_0.2)_0.99Mn_0.01O₃ electroceramics

Ravikant

Singh

Ojha

et al. 2020

Mater. Res. Express

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We report the effect of humidity and temperature on the dielectric and impedance properties of leadfree potassium tantalum niobium oxide (KTN). It illustrates large dielectric constant∼4500 at 1 kHz, low tangent loss in dry condition, which drastically changes under humidity condition. The nature and magnitude of dielectric constant and tangent loss were moderately different in both heating and cooling conditions. A series of phase transitions from rhombohedral to orthorhombic (below room temperature), and orthorhombic to tetragonal (∼185°C) and tetragonal to Cubic (390°C) have been obtained respectively over a wide range of temperature with a significant change in magnitude and nature in transition temperature during cooling mode. A detail transport properties have been carried out based on Impedance spectra, Modulus spectra, Nyquist Plot, and ac conductivity to establish a microstructure-property relation. The activation energy of the charge carriers determined that mainly electronic charge carriers contribute to transport properties in the low-temperature range while oxygen vacancies and cations near the high-temperature ferroelectric phase transition. The effect of moisture on room temperature capacitance, tangent loss, and impedance have been discussed.

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Section: Field Dependent Polarizationmentioning

confidence: 92%

Effect of temperature and humidity on dielectric and impedance properties of K(Nb_0.8Ta_0.2)_0.99Mn_0.01O₃ electroceramics

Ravikant

Singh

Ojha

et al. 2020

Mater. Res. Express

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“…This could be attributed to the improved electrical polarization at low frequency, with more dipoles having enough time to reach polarization equilibrium in the low frequency region. 52 Interestingly, the e r values of the all-organic 5CB/PVDF films increase more significantly at high temperatures after adding LC small molecule 5CB. It is clearly seen that the e r increases from 18.43 to 34.13 at 150 1C (see Fig.…”

Section: Dielectric Properties Of the 5cb/pvdf Compositesmentioning

confidence: 98%

“…This is because when the temperature is up to a certain range, the temperature provides strong thermal agitation, leading to the high electric conductive loss caused by the impurities. 52…”

Section: Dielectric Properties Of the 5cb/pvdf Compositesmentioning

confidence: 99%

Achieving synergistic improvement in dielectric constant and energy storage properties of all-organic liquid crystal molecule/PVDF composites

Luo

Yan

et al. 2022

J. Mater. Chem. C

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“…On the other hand, the polarization of Device 2 is less due to the ability to store the static charge for rubber surfaces being less than the papers. [ 28 ] The pure P(VDF‐TrFE) polymer is a very good ferroelectric but it turns to the weak FE. This is because of its weak flexo–electro–mechanical behavior under high vibration frequency.…”

Section: Resultsmentioning

confidence: 99%

PVDF Based Static Charge Induced Flexoelectric Microphone

Shehzad

Pan

Wang

et al. 2023

Adv Elect Materials

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However, to effectively tune ferroelectric polymer materials and devices, a complete understanding of the polarization phenomena is critical. [6] The discovery of polarization whirlpools in strained ferroelectric polymers has opened up new vistas of research. [7,8,9] Scientists are now trying to more accurately visualize these concentric rings to tune and to optimize piezoelectric device performance. [10,11] Another way to maximize output from these piezoelectric polymers is to optimize the device design. [12,13] An example is in the design of piezoelectric microphones. Thin film piezoelectric microphones are posing great limitations if we use it in sophisticated devices. [14] Piezoelectric microphones require high sound throughput and generate relatively small output signals. [15] These output signals can be enhanced by tuning the piezoelectric properties. [16] FE behavior of dielectric materials was discovered in 1950. Initially, the weak FE behavior of dielectrics was reported. However, the enhanced response of FE behavior was reported in early 2000 for Pervoskite ceramics. [17] Initial measurement of the FE coefficient in ceramics was difficult and empirical values were three to eight orders of magnitude higher than theoretically predicted values. [18] The FE coefficient in perovskite ceramics, µ, was proportional to the dielectric susceptibility χ and can be written as µ = χ × e/a-, [19] where e is the electron charge and a is the unit cell dimension. [20] The empirically measured FE response not only depends on intrinsic material ferroelectricity but is also affected by extrinsic forces such as strain gradient that may also affect results. [21] In attempting to optimize device design, researchers found that the strain gradient in pervoskite ceramics can be increased by reducing size. [22] Therefore the equation (µ = χ × e/a) can be further expressed more generally as: [23] Polyvinylidenedifluoride (PVDF)-based microphones are either categorized as piezoelectric (PE) microphones or flexoelectric (FE)-induced PE microphones. Based on the production of electrostatic charge and higher sensitivity, here, a static charge induced flexoelectric microphone (SC I F E M) is introduced. In this research, two SC I F E M transducers are fabricated, one by sandwiching P(VDF-TrFE) laminate between pair of two aluminum electrodes wrapped in stretched paper sheets (called Device 1) and the other by sandwiching P(VDF-TrFE) laminate between a pair of two Al electrodes wrapped in stretched rubber sheets (called Device 2). Devices 1 and 2 are compared with a simple PVDF-based FE microphone (called Device 0). In this study, Devices 0, 1, and 2 are characterized for flexoelectric (FE) and charge induction (CI) properties.It is observed that despite its poor FE behavior, higher sensitivity of Device 1 is due to its electrostatic charge induced beta phase present at 1170 cm −1 of Fourier transform infrared spectra. The X-Ray diffraction spectroscopy is also performed in accordance to the polar beta phase. It is reported that due to ...

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Electro-mechanical properties of free standing micro- and nano-scale polymer-ceramic composites for energy density capacitors

Cited by 20 publications

References 41 publications

Effect of temperature and humidity on dielectric and impedance properties of K(Nb_0.8Ta_0.2)_0.99Mn_0.01O₃ electroceramics

Effect of temperature and humidity on dielectric and impedance properties of K(Nb_0.8Ta_0.2)_0.99Mn_0.01O₃ electroceramics

Achieving synergistic improvement in dielectric constant and energy storage properties of all-organic liquid crystal molecule/PVDF composites

PVDF Based Static Charge Induced Flexoelectric Microphone

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Electro-mechanical properties of free standing micro- and nano-scale polymer-ceramic composites for energy density capacitors

Cited by 20 publications

References 41 publications

Effect of temperature and humidity on dielectric and impedance properties of K(Nb0.8Ta0.2)0.99Mn0.01O3 electroceramics

Effect of temperature and humidity on dielectric and impedance properties of K(Nb0.8Ta0.2)0.99Mn0.01O3 electroceramics

Achieving synergistic improvement in dielectric constant and energy storage properties of all-organic liquid crystal molecule/PVDF composites

PVDF Based Static Charge Induced Flexoelectric Microphone

Contact Info

Product

Resources

About

Effect of temperature and humidity on dielectric and impedance properties of K(Nb_0.8Ta_0.2)_0.99Mn_0.01O₃ electroceramics

Effect of temperature and humidity on dielectric and impedance properties of K(Nb_0.8Ta_0.2)_0.99Mn_0.01O₃ electroceramics