The Influence of Individual Phases on Piezoelectric Coefficient of PZT-PVdF Composites

Greeshma, T.; Balaji, R.; Nayak, M. M.; Jayakumar, S.

doi:10.1080/00150190903412978

Cited by 16 publications

(8 citation statements)

References 6 publications

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“…It can be found that the area of the peaks corresponding to β phase decreases from 16.57 to 3.14 J/g for a PZT particle size Downloaded by [Dalhousie University] at 04:17 17 September 2013 variation of 106 μm to 40 nm. The decrease in the amount of β phase with ceramic particle size is due to the poling of the composites where the other crystalline forms of PVDF are getting converted to β form with the help of local electric field provided by PZT particles [34]. FTIR studies of poled composites were carried out to ascertain the presence of β-phase PVDF.…”

Section: Resultsmentioning

confidence: 99%

“…It is well known that poling is one of the methods through which β-phase formation can be induced in PVDF. During poling it was found that the PZT particles act as a source of electric field to convert other crystalline phases such as α and γ to β-phase [34]. It is clear from FTIR and DSC studies that the amount of β-phase increases with increase ceramic particle size after poling.…”

Section: Tablementioning

confidence: 96%

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PVDF Phase Formation and Its Influence on Electrical and Structural Properties of PZT-PVDF Composites

Greeshma

Balaji

Jayakumar

2013

Ferroelectrics Letters Section

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The aim of the study is to find the role of lead zirconate titanate (PZT) in the phase formation of poly vinylidene fluoride (PVDF) and its effect on electrical and structural properties of PZT-PVDF composites (50 Vol%) with 0-3 connectivity. PZT particles of different sizes ranging from micron to nano are used. The particle size (<100 nm) were determined from TEM and the broadening of the characteristic diffraction peaks in the x-ray diffraction (XRD) pattern. Scanning electron microscopy (SEM), studies were performed to analyze the nature of ceramic particle distribution within the matrix. The percentage of polymer crystallinity was determined from differential scanning calorimetry (DSC) and found to decrease with decrease in ceramic particle size. The decrease in the crystallinity percentage is due the hindrance offered by ceramic during the crystallization of the polymer. The melting endotherms of the composites were deconvoluted and the amount of PVDF β-phase present in the composites were determined and was found to decrease with decrease in ceramic particle size. Fourier transform infrared spectroscopy (FTIR) studies were also carried out to confirm the decrease in the β-phase content with decrease in particle size. The variation in the amount of β-phase of the polymer is due to the presence of PZT which acts as a source of electric field during poling and converts other polymer phases to β-phase. The piezoelectric coefficient and remnant polarization was found to decrease with decrease in ceramic particle size and is due to the decrease in percentage of β phase in the composites.

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Section: Resultsmentioning

confidence: 99%

Section: Tablementioning

confidence: 96%

PVDF Phase Formation and Its Influence on Electrical and Structural Properties of PZT-PVDF Composites

Greeshma

Balaji

Jayakumar

2013

Ferroelectrics Letters Section

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“…Experimental studies reveal that hot press technique was found to be more effective for the preparation of 0–3 connected composites with better piezoelectric properties. Greeshma et al investigated the influence of the individual phases by using densified and calcinated reinforcement by hot press technique and the analysis of the depoling studies. PZT‐PVDF composites were prepared using solvent casting method, with cyclohexanone as a solvent.…”

Section: Reviewmentioning

confidence: 99%

Dielectric and piezoelectric properties of PVDF/PZT composites: A review

Jain

Prashanth

Sharma

et al. 2015

Polymer Engineering & Sci

321

164

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Smart materials, which exhibit piezoelectricity, find an eclectic range of applications in the industry. The direct piezoelectric effect has been widely used in sensor design, and the inverse piezoelectric effect has been applied in actuator design. Ever since 1954, PZT and BaTiO 3 were widely used for sensor and actuator applications despite their toxicity, brittleness, inflexibility, etc. With the discovery of PVDF in 1969, followed by development of copolymers, a flexible, easy to process, nontoxic, high density alternate with high piezoelectric voltage coefficient was available. In the past 20 years, heterostructural materials like polymer ceramic composites, have received lot of attention, since these materials combine the excellent pyroelectric and piezoelectric properties of ceramics with the flexibility, processing facility, and strength of the polymers resulting in relatively high dielectric permittivity and breakdown strength, which are not attainable in a single phase piezoelectric material. The current review article is an attempt to provide a compendium of all the work carried out with reference to PVDF-PZT composites. The review article evaluates the effect of grain size, content and other factors under the purview of dielectric and piezoelectric properties while evaluating the sensitivity of the material for sensor application. POLYM. ENG. SCI., 55:1589-1616, 2015

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“…The increase in piezoelectric coefficient with increase in PZT particle size was due to the conversion of other crystalline phases of PVdF into β-phase during poling, which contributes to the piezoelectricity. During poling it was found that the PZT particles act as a source of electric field converting other crystalline phases such as α and γ to β-phase [9]. Differential scanning calorimetry (DSC) experiments were performed on the composites to estimate the crystallinity of the polymer matrix before poling.…”

Section: Measurementsmentioning

confidence: 99%

Effect of Nano Sized Reinforcement in PZT Based Composites

Greeshma

Balaji

Jayakumar

2010

Integrated Ferroelectrics

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PZT-PVdF composites with 0-3 connectivity were prepared through solution casting technique. The effect of particle size (>106 µm, 106-63 µm, >63-25 µm, 80 nm, 60 nm and 40 nm) on piezoelectric coefficient (d 33 ) of the composites was studied. The amount of crystallinity and piezoelectric coefficient of the composites were obtained from DSC and piezometer, respectively. The PZT particles distribution in the polymer matrix was analyzed using SEM studies. The amount of crystallinity was found to decrease with decrease in particle size, which in turn decreases the piezoelectric coefficient. The investigation reveals that the dispersed reinforcement influences the crystallization kinetics of PVdF polymer chain, thereby promoting localized amorphous regions, which decreases the piezoelectric coefficient.

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The Influence of Individual Phases on Piezoelectric Coefficient of PZT-PVdF Composites

Cited by 16 publications

References 6 publications

PVDF Phase Formation and Its Influence on Electrical and Structural Properties of PZT-PVDF Composites

PVDF Phase Formation and Its Influence on Electrical and Structural Properties of PZT-PVDF Composites

Dielectric and piezoelectric properties of PVDF/PZT composites: A review

Effect of Nano Sized Reinforcement in PZT Based Composites

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