Original Crystal-Chemical Behaviors in (Ba,Sr) 2 Ln(Fe,Nb,Ta) 5 O 15 Tetragonal Tungsten Bronze: Anion-Driven Properties Evidenced by Cationic Substitutions
Crystal Growth & Design(2014)
摘要
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 Ba(2)LnFeNb(4)O(15) (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.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络