Dielectric/ferroelectric properties of ferroelectric ceramic dispersed poly (vinylidene fluoride) with enhanced beta-phase formation
IR@NPL: CSIR-National Physical Laboratory, New Delhi
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| Title |
Dielectric/ferroelectric properties of ferroelectric ceramic dispersed poly (vinylidene fluoride) with enhanced beta-phase formation
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| Creator |
Mohanty, Hari Sankar
-, Ravikant Kumar, Ashok Kulriya, Pawan K. Thomas, Reji Pradhan, Dillip K. |
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| Subject |
Materials Science
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| Description |
Free standing and flexible ferroelectric ceramic-polymer composites (PVDF + Phi wt% of BNBT (0.94Na(0)(.)(5)Bi(0)(.)(5)TiO(3)-0.06BaTiO(3))) with 0-3 connectivity were synthesized by solution-casting technique. Composite nature and homogeneous distribution of ceramic filler particles in PVDF were confirmed with x-ray diffraction and scanning electron microscopic analysis. The intensity ratio of beta-phase with respect to alpha-phase i.e., I-20(.2)./I-18.4. (obtained from XRD analysis) and the fraction of electro-active beta phase i.e., F(beta)% (obtained from FTIR analysis) are enhanced with increase in filler concentrations and peaked for 35 wt% of the ceramic filler. An enhancement of the % of crystallinity (calculated from XRD analysis) has been observed with increase in the filler concentrations. The increase of the fraction of beta-phase has been explained on the basis of ion (negatively charged surface ion of the ferroelectric ceramic filler) -dipole (-CH2 dipole of the polymer matrix) interactions, as evidenced from FTIR and UV-VIS absorbance spectra. Relative dielectric permittivity (dielectric constant) and ferroelectric polarization were found to be highest for the composite with 35 we% of ferroelectric ceramic filler. Percolation theory has been successfully employed to explain the observed trend in the dielectric properties with the compositional variation. Significant enhancement in the electro active beta-phase has been correlated with the improved dielectric and ferroelectric properties of the composite.
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| Publisher |
Elsevier
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| Date |
2019-05-15
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://npl.csircentral.net/4152/1/Dielectric%20ferroelectric%20properties.pdf
Mohanty, Hari Sankar and -, Ravikant and Kumar, Ashok and Kulriya, Pawan K. and Thomas, Reji and Pradhan, Dillip K. (2019) Dielectric/ferroelectric properties of ferroelectric ceramic dispersed poly (vinylidene fluoride) with enhanced beta-phase formation. Materials Chemistry and Physics, 230. pp. 221-230. ISSN 0254-0584 |
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| Relation |
http://npl.csircentral.net/4152/
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