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Metastable ferroelectric phase and crossover in the Ba2NdFeNb4-xTaxO15 TTB solid solution

Abstract

In the framework of the crystal chemical investigation of Tetragonal Tungsten Bronze (TTB) niobates, the Ba2NdFeNb4-xTaxO15 solid solution has been investigated in order to gain insight on the relaxor to ferroelectric crossover and it features. Single-phase ceramics were synthesised by a conventional two-step firing and sintering and underwent extended chemical, structural, microstructural and physical characterizations. For Nb-rich compositions (x ≤ 0.5), the temperature dependence of the dielectric permittivity, the pyroelectric coefficient, and also the ferroelectric hysteresis loops revealed a nonconventional relaxor to ferroelectric crossover, confirmed by piezoelectric measurements for x ≤ 0.1. A thermal hysteresis of the ferroelectric transition revealed the existence of a metastable ferroelectric phase, in these TTB niobates. An accurate and reliable dielectric phase diagram is established from these observations, which allows discussing the original sequence of dielectric phase transitions encountered in this solid solution.

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Publication details

The article was received on 17 Oct 2017, accepted on 09 Jan 2018 and first published on 11 Jan 2018


Article type: Paper
DOI: 10.1039/C7TC04742H
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Metastable ferroelectric phase and crossover in the Ba2NdFeNb4-xTaxO15 TTB solid solution

    M. Albino, P. Heijboer, F. Porcher, R. Decourt, P. Veber, M. Maglione and M. Josse, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C7TC04742H

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