Dielectric relaxations in PVDF/BaTiO3 nanocomposites

Chanmal, Chetan; Jog, J. P.

doi:10.3144/expresspolymlett.2008.35

Cited by 293 publications

(203 citation statements)

References 32 publications

Supporting

Mentioning

172

Contrasting

Unclassified

Order By: Relevance

“…The grain boundary activation energy evaluated from the slope of lnτ gb against 1/T curve is found to be 0.42 eV and 0.38 eV for CR1 and CR2, respectively. This value agrees with the value reported earlier for Maxwell-Wagner relaxation arising from the interfacial polarization for CCTO ceramic which confirms the temperature dependence of dielectric properties [26,27]. …”

Section: Resultssupporting

confidence: 92%

Dielectric behavior of CaCu3Ti4O12 electro-ceramic doped with La, Mn and Ni synthesized by modified citrate-gel route

Singh

Kumar

et al. 2013

J Adv Ceram

View full text Add to dashboard Cite

Abstract:The effect of La 3+ , Mn 2+ and Ni 2+ doped calcium copper titanate, CaCu 3 Ti 4 O 12 (CCTO), at higher concentrations (CR1 and CR2 with 5 mol% and 10 mol%, respectively), has been examined by semi-wet route at relatively lower temperature. This semi-wet route employs citrate-nitrate gel chemical method using TiO 2 solid powders. X-ray diffraction (XRD) analysis confirms the formation of single phase in the doped samples sintered at 900 ℃ for 8 h. Scanning electron micrographs (SEM) show that the average grain size for CR2 is larger than that of CR1 composition. The energy dispersive X-ray spectroscopy (EDX) is used to study the percentage compositions of different ions present in both ceramics. Dielectric constant (ε r ) and dielectric loss (tanδ) values of CR1 are comparatively higher than those of CR2 ceramic at all measured frequencies and temperatures. The nature of temperature-dependent relaxation behavior of the ceramics is also studied by impedance, modulus spectroscopic analysis and confirms Maxwell-Wagner relaxation.

show abstract

Section: Resultssupporting

confidence: 92%

Dielectric behavior of CaCu3Ti4O12 electro-ceramic doped with La, Mn and Ni synthesized by modified citrate-gel route

Singh

Kumar

et al. 2013

J Adv Ceram

View full text Add to dashboard Cite

show abstract

“…Another possible route is the development of nanocomposite materials [4]; both fillers with high permittivity, as e.g. BaTiO 3 [8][9][10][11][12][13], and conducting fillers, as metal nanoparticles and graphite nanosheets, which can form percolative composites [14,15], have been added to PVDF and its copolymers.…”

Section: Introductionmentioning

confidence: 99%

Effect of silane coupling agent on the morphology, structure, and properties of poly(vinylidene fluoride–trifluoroethylene)/BaTiO3 composites

et al. 2014

View full text Add to dashboard Cite

and their thermal, viscoelastic and dielectric properties were investigated. When surface modified BaTiO 3 was used, it was possible to decrease both the viscoelastic and the dielectric losses of highly filled solvent cast films, while their storage modulus and relative permittivity either increased or remained equal, owing to reduced porosity and improved matrix-filler compatibility. The effect of BaTiO 3 surface modification on the morphology of compression molded films was less marked, leading to unchanged viscoelastic properties, and lower permittivity and dielectric losses. For all composites the frequency dependency of the dielectric properties at low frequencies was suppressed with modified BaTiO 3 .

show abstract

“…As pointed out in a recent review [33], modification of the surface of the ceramic fillers, through chemical grafting or the production of core-shell structures is key to improve filler dispersion, reduce porosity, thereby improving the mechanical, and electrical properties of the composites. Most of the existent studies focus on the dielectric [34][35][36][37][38][39][40][41][42][43] and electromechanical [4,7,13,15,17,25,44] properties of such composites and relatively few systematic studies on their thermal and mechanical behavior have been published so far. Furthermore the ceramic volume fractions considered are often much lower than those used in most applications [45], studies of highly filled composites mainly being limited to lead-based ferroelectric materials [46,47].…”

Section: Introductionmentioning

confidence: 99%

The effect of processing conditions on the morphology, thermomechanical, dielectric, and piezoelectric properties of P(VDF-TrFE)/BaTiO3 composites

et al. 2012

View full text Add to dashboard Cite

In this study (0-3) P(VDF-TrFE)/BaTiO 3 composites containing up to 60 vol% of ceramic phase were prepared by solvent casting or compression molding. Their thermomechanical, dielectric, and piezoelectric properties were investigated, and discussed in the light of the properties of the basic components, the processing route and the resulting morphology. The crystalline structure of the P(VDF-TrFE) matrix was found to be highly dependent on the processing route, while the structure of BaTiO 3 was not affected by any of the processing steps. The mechanical properties of the solvent cast materials showed a maximum at 30 vol% BaTiO 3 , while they increased monotonically with BaTiO 3 content for compression molded materials. This difference was attributed to a higher amount of porosity and inhomogeneities in the solvent cast composites. Permittivity as high as 120 and piezoelectric coefficient d 33 up to 32 pC/N were obtained for compression molded composites, and the observed decrease in d 33 with aging time was attributed to the effect of mechanical stress release in the polymer matrix.

show abstract

Dielectric relaxations in PVDF/BaTiO3 nanocomposites

Cited by 293 publications

References 32 publications

Dielectric behavior of CaCu3Ti4O12 electro-ceramic doped with La, Mn and Ni synthesized by modified citrate-gel route

Dielectric behavior of CaCu3Ti4O12 electro-ceramic doped with La, Mn and Ni synthesized by modified citrate-gel route

Effect of silane coupling agent on the morphology, structure, and properties of poly(vinylidene fluoride–trifluoroethylene)/BaTiO3 composites

The effect of processing conditions on the morphology, thermomechanical, dielectric, and piezoelectric properties of P(VDF-TrFE)/BaTiO3 composites

Contact Info

Product

Resources

About