Investigation of dielectric relaxation processes in Ba2NdFeNb4-xTaxO15 ceramics
Langue
en
Article de revue
Ce document a été publié dans
Ferroelectrics. 2015, vol. 485, n° 1, p. 101-109
Taylor & Francis: STM, Behavioural Science and Public Health Titles
Résumé en anglais
Dielectric response of Ba2NdFeNb4-xTaxO15 (x = 0.3, 0.6 and 2) solid solutions with Tetragonal Tungsten Bronze structure has been investigated by means of broadband dielectric spectroscopy in the frequency range from 20 ...Lire la suite >
Dielectric response of Ba2NdFeNb4-xTaxO15 (x = 0.3, 0.6 and 2) solid solutions with Tetragonal Tungsten Bronze structure has been investigated by means of broadband dielectric spectroscopy in the frequency range from 20 Hz to 37 GHz. Pure Ba2NdFeNb4O15 compound displays ferroelectric behavior. Substitution of Nb5+ by Ta5+ considerably alters dielectric response of this system. Ferroelectric state was observed only for x = 0.3 compound with slightly lowered ferroelectric phase transition temperature. Further increase of x causes formation of relaxor state in these solid solutions and considerably lowers corresponding dielectric permittivity dispersion temperature region.< Réduire
Mots clés en anglais
Tetragonal tungsten bronze
broadband dielectric spectrosopy
ferroelec trics
ferroelectric relaxor
dielectric relaxation
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