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- W2332474311 abstract "A set of $mathrm{Pb}({mathrm{Mg}}_{1/3}{mathrm{Nb}}_{2/3}){mathrm{O}}_{3}$ (PMN) relaxor ceramics with different porosities (66--96% of theoretical density) was processed from the pure perovskite PMN powder by varying the sintering temperature (930--980 K) and isostatic pressure. The effective room temperature permittivity at 100 Hz varied correspondingly from ensuremath{sim}4000 to ensuremath{sim}15 000. We measured and fitted the room temperature infrared (IR) reflectivity of corresponding polished ceramics, from which the effective dielectric function was obtained. The results were compared with the low-frequency permittivity data and discussed using several effective medium models. The best results were obtained using the Lichtenecker model (with the exponent ensuremath{alpha} ensuremath{approx} 0.2), which fits quite well the IR spectra as well as the static permittivity for all the porosity values. Also the simulation using the finite element method supported the same model. It allows us to conclude that the samples show quite complex shape and topology of the pores, but all of the pores show similarity with a weak nonzero percolation (open porosity)." @default.
- W2332474311 created "2016-06-24" @default.
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- W2332474311 date "2014-06-16" @default.
- W2332474311 modified "2023-09-26" @default.
- W2332474311 title "Effective dielectric function of porous<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>Pb</mml:mi><mml:mo>(</mml:mo><mml:msub><mml:mi>Mg</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Nb</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:mo>)</mml:mo><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>ceramics" @default.
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- W2332474311 doi "https://doi.org/10.1103/physrevb.89.214307" @default.
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