Original crystal-chemistry behaviors in (Ba, Sr)2Ln(Fe, Nb, Ta)5O15 tetragonal tungsten bronze: anion-driven properties evidenced by cationic substitutions
Language
en
Article de revue
This item was published in
Crystal Growth & Design. 2014, vol. 14, n° 11, p. 5428-5435
American Chemical Society
English Abstract
From room-temperature composite multiferroics to relaxor to ferroelectric crossovers, many original behaviors were recently evidenced in compounds and/or solid solutions related to the Ba2LnFeNb4O15 (Ln = rare earth) family ...Read more >
From room-temperature composite multiferroics to relaxor to ferroelectric crossovers, many original behaviors were recently evidenced in compounds and/or solid solutions related to the Ba2LnFeNb4O15 (Ln = rare earth) family of tetragonal tungsten bronze (TTB) materials. We show how an empirical crystal chemistry approach, while yielding unexpected results, allowed for a better understanding of these original and sometimes specific behaviors. A survey of the dielectric properties of four solid solutions derived from the Ba2NdFeNb4O15 ferroelectric TTB is presented. We also show how the diversity of compositions and chemical substitution patterns unveils the anionic driving force behind the relaxor to ferroelectric crossovers. We finally discuss the probable involvement of aperiodic modulations in these crossovers and the fact that these modulations may constitute an additional degree of freedom to control the properties of TTB structured functional materials.Read less <
English Keywords
tetragonal tungsten bronze (TTB) materials
tetragonal tungsten bronze (TTB) materials
Dielectric properties
Solid solutions
Ferroelectric
ANR Project
Croissance Cristalline d'Oxydes Dielectriques - ANR-09-JCJC-0079
Origin
Hal imported