Journal ArticleDOI
Study of Landau-Lifshitz-Looyenga's formula for dielectric correlation between powder and bulk
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In this paper, the authors used Landau-Lifshitz-Looyenga's formula for correlation of bulk and powder dielectric parameters at microwave and radio frequencies.Abstract:
Landau-Lifshitz-Looyenga's formula for correlation of bulk and powder dielectric parameters has been investigated at microwave and radio frequencies for a number of materials for wide enough experimental conditions of particle size, shape and packing fraction. It has been found that the formula gives good accuracy (about 3%) for dielectric constant determination for particle size not less than 50 μm. For fine powders (particle size less than 30 μm) the deduced dielectric constant is too low by about 3-8%. Dielectric loss determination from the formula is, however, less accurate, the deduced values being always too low by about 10-20%.read more
Citations
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Grain size effect on the dielectric behavior of nanostructured Ni0.5Zn0.5Fe2O4
TL;DR: In this article, the effect of milling, frequency, and temperature on the dielectric properties of nanocrystalline Ni-Zn ferrite is discussed and the electrical modulus has been fitted to a stretched exponential function.
Journal ArticleDOI
Density-permittivity relationships for powdered and granular materials
TL;DR: Results of testing linear extrapolation techniques and dielectric mixture equations on pulverized coal, limestone, plastics, and granular wheat and flour are presented and recommendations are provided for reliable estimation of solid material permittivities.
Journal ArticleDOI
Relationships between microwave permittivities of solid and pulverised plastics
S O Nelson,T S You +1 more
TL;DR: In this paper, the complex permittivities (dielectric properties) of two plastics, Rexolite 1422 and Kynar, were measured at frequencies of 2.45, 11.5 and 22.0 GHz at 25 degrees C by the short-circuited waveguide technique.
Journal ArticleDOI
Measurement of the Solid Dielectric Permittivity of Clay Minerals and Granular Samples Using a Time Domain Reflectometry Immersion Method
TL;DR: In this paper, the authors developed a recently proposed immersion methodology that is suitable for fine-grained mineral samples and clay minerals and tested it on a high surface montmorillonite sample where the immersion polar fluid adsorbed to the clay.
Journal ArticleDOI
Electrical and magnetic behaviour of nanostructured MgFe2O4 spinel ferrite
TL;DR: In this paper, the authors have synthesized nanostructured MgFe 2 O 4 spinel with various grain sizes ranging from 72 to 19nm using ceramic method and followed by high-energy ball milling.
References
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Journal ArticleDOI
Dielectric constants of heterogeneous mixtures.
TL;DR: In this paper, the Bruggeman and Bottcher equation for the dielectric constant of a heterogeneous system is reconsidered and a theoretical model is designed from which both formulae can be derived.
Journal ArticleDOI
Formulae for Dielectric Constant of Mixtures
J A Reynolds,J M Hough +1 more
TL;DR: In this paper, the major formulae suggested for the dielectric constant of a mixture of two components (at least one of which has the form of particles containing many molecules) are shown to be all related to another.
Journal ArticleDOI
Dielectric Properties of Unsintered Barium Titanate
TL;DR: In this paper, the initial nonlinear variation of dielectric constant and dissipation factor with temperature observed is attributed to the water vapor adsorbed on the surface exposed to the pores.
Journal ArticleDOI
The temperature dependence of the static dielectric constant of alkali, silver and thallium halides
TL;DR: Measured values of the static dielectric constant between 15°K and 290°K for seventeen metal halides were reported in this paper, together with calculated values for the effective charge parameter and the L0 mode frequencies at 42°K.