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Effective dielectric function of porous Pb(Mg.sub.1/3./sub.Nb.sub.2/3./sub.O.sub.3./sub. ceramics
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SYSNO ASEP 0434319 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Effective dielectric function of porous Pb(Mg1/3Nb2/3O3 ceramics Tvůrce(i) Nuzhnyy, Dmitry (FZU-D) RID, ORCID
Petzelt, Jan (FZU-D) RID, ORCID, SAI
Rychetský, Ivan (FZU-D) RID, ORCID
Trefalt, G. (SI)Zdroj.dok. Physical Review. B - ISSN 1098-0121
Roč. 89, č. 21 (2014), "214307-1"-"214307-5"Poč.str. 5 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova PMN ceramics ; infrared and THz spectroscopy ; effective medium models ; finite element method Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP GAP204/12/0232 GA ČR - Grantová agentura ČR Institucionální podpora FZU-D - RVO:68378271 UT WOS 000337729400003 EID SCOPUS 84902440689 DOI 10.1103/PhysRevB.89.214307 Anotace A set of Pb(Mg1/3Nb2/3)O3 (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. 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 effectivemedium models. The best results were obtained using the Lichtenecker model, 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). Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2015
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