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首页> 外文期刊>Crystal growth & design >Original Crystal-Chemical Behaviors in (Ba,Sr)_2Ln(Fe,Nb,Ta)_5O_(15) Tetragonal Tungsten Bronze: Anion-Driven Properties Evidenced by Cationic Substitutions
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Original Crystal-Chemical Behaviors in (Ba,Sr)_2Ln(Fe,Nb,Ta)_5O_(15) Tetragonal Tungsten Bronze: Anion-Driven Properties Evidenced by Cationic Substitutions

机译：（Ba，Sr）_2Ln（Fe，Nb，Ta）_5O_（15）四方钨青铜中的原始晶体化学行为：阳离子取代证明的阴离子驱动性质。

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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_2LnFeNb_4O_(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 Ba_2NdFeNb_4O_(15) 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.
机译：从室温复合铁电体到弛豫器到铁电交叉点，最近在与Ba_2LnFeNb_4O_（15）（Ln =稀土）四方钨青铜（TTB）材料族有关的化合物和/或固溶体中发现了许多原始行为。我们展示了经验晶体化学方法如何在产生意想不到的结果的同时，可以更好地理解这些原始的，有时是特定的行为。提出了从Ba_2NdFeNb_4O_（15）铁电TTB衍生的四种固溶体的介电性能的调查。我们还展示了组成和化学取代模式的多样性如何揭示了弛豫器与铁电交叉作用背后的阴离子驱动力。最后，我们讨论了非周期性调制可能涉及这些交叉点，以及这些调制可能构成控制TTB结构化功能材料性能的附加自由度这一事实。

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