Correlation and multipolar effects in the dielectric response of particulate matter: An iterative mean-field theory

Claro, F.; Rojas, Rodríguez

doi:10.1103/physrevb.43.6369

Cited by 23 publications

(14 citation statements)

References 27 publications

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“…This mixing rule was modified for polymer-ceramic composites incorporating homogeneous distribution of spherical ceramic particles and the excitation of dipolar character is considered [22].…”

Section: Theoretical Modeling Of Relative Permittivitymentioning

confidence: 99%

Preparation and properties of BaTiO3 filled butyl rubber composites for flexible electronic circuit applications

Chameswary

Sebastian

2015

J Mater Sci: Mater Electron

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Butyl rubber-micron barium titanate (BR/BT) and butyl rubber-nano barium titanate (BR/nBT) composites were prepared by sigma mixing followed by hot pressing. The tensile tests show that both the composites were mechanically flexible. The microwave dielectric properties of both BR/BT and BR/nBT composites were investigated as a function of ceramic loading and were found to be improved with filler content. The butyl rubber has a relative permittivity (e r ) of 2.4 and loss tangent (tan d) of 0.0017 at 5 GHz. At a filler loading of 0.24 volume fraction (v f ) of micron sized barium titanate (BaTiO 3 ) powder loading, the composite attained a e r of 7 and tan d of 0.014 and for the same filler content of nano BaTiO 3 the composite have e r of 8.9 and tan d of 0.019 at 5 GHz. The thermal and mechanical properties of both the composites were investigated. The experimental values of e r of both BR/BT and BR/nBT composites for different volume fractions were compared with theoretical models.

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Section: Theoretical Modeling Of Relative Permittivitymentioning

confidence: 99%

Preparation and properties of BaTiO3 filled butyl rubber composites for flexible electronic circuit applications

Chameswary

Sebastian

2015

J Mater Sci: Mater Electron

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“…The multipolar contributions to the local field are also neglected. But these assumptions are valid only in dilute systems 27 . Hence, as the interparticle distance decreases with the increase in filler volume fraction, Maxwell–Garnett formula may not yield accurate results.…”

Section: Resultsmentioning

confidence: 99%

Mechanically Flexible Butyl Rubber-SrTiO3 Composite Dielectrics for Microwave Applications

Thomas

Chameswary

Sebastian

2011

International Journal of Applied Ceramic Technology

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Mechanically flexible butyl rubber–SrTiO3 composites were prepared through sigma mixing followed by hot pressing. Tensile tests established the mechanical flexibility of the composites. Swelling tests revealed the degree of matrix–filler interactions. The effect of SrTiO3 ceramic filler on the dielectric properties of the composites was studied at 1 MHz and 5 GHz using an LCR meter and a Split Post Dielectric Resonator, respectively. The relative permittivity of the composites increased with filler loading while maintaining low dielectric loss. For the maximum filler content of 0.42 volume fraction, the composite showed a relative permittivity of 13.2 and a loss tangent of 2.8 × 10−3 at 5 GHz. Theoretical modeling of effective relative permittivity of the composites was performed and the results were correlated with the experimental data. Effect of repeated bending on the microwave dielectric properties of the composite was also studied. The coefficient of thermal expansion of the composites was observed to decrease with the increased ceramic filler dispersion and reached a minimum value of 26.2 ppm/°C.

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“…Nanospheres also must be much smaller than the wavelength so that their dipolar quasistatic representation is correct. However Fu et al 35 and Claro et al 36 have proved this formula to be exact regardless of the particle concentration provided that the two-particle distribution is spherically symetric. In fact the applicability of MG only lies in the representation of the set of spheres by an equivalent homogeneously polarized medium must be well separated, i.e., there should be no aggregates.…”

Section: B Matter Modelingmentioning

confidence: 97%

Optical properties of cobalt clusters implanted in thin silica layers

Gilliot¹,

Naciri²,

Stoquert

et al. 2006

Phys. Rev. B

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We present an optical characterization of cobalt nanostructured silica thin layers. Cobalt clusters in the size range 4 -8 nm are obtained after implantation of Co + ions into 200-nm-thick silica ͑SiO 2 ͒ layers on c-oriented silicon substrate ͑Si͒. Implantation has been performed for substrate temperatures of 295 K ͑Room Temperature͒ and 600°C. Spectroscopic ellipsometry measurements have been carried out on the 350-850 nm spectral range. Different simulation models have been developed to understand optical responses of these layers. We investigate all effects that can have an influence on the optical responses such as sample structure, size effects, defects of silica, and oxided particles. We show that the samples can be correctly modelled by considering the layers as a homogeneous mixture of cobalt clusters and silica buried into silica. Such a mixture is perfectly characterized by the Maxwell-Garnett cermet topology dielectric function. Additional Rutherford backscattering measurements have been carried out to question optical results and show the reliability of the ellipsometric approach.

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Correlation and multipolar effects in the dielectric response of particulate matter: An iterative mean-field theory

Cited by 23 publications

References 27 publications

Preparation and properties of BaTiO3 filled butyl rubber composites for flexible electronic circuit applications

Preparation and properties of BaTiO3 filled butyl rubber composites for flexible electronic circuit applications

Mechanically Flexible Butyl Rubber-SrTiO3 Composite Dielectrics for Microwave Applications

Optical properties of cobalt clusters implanted in thin silica layers

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