Rare-Earth Pnictide Oxides (RE,Ca)mPnnOm (Pn = Sb, Bi): A Review of Crystal Structures, Chemistry, Compositions, and Physical Properties,Chemistry of Materials

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Rare-Earth Pnictide Oxides (RE,Ca)mPnnOm (Pn = Sb, Bi): A Review of Crystal Structures, Chemistry, Compositions, and Physical Properties
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-11-14 00:00:00 , DOI: 10.1021/acs.chemmater.7b03996
Scott Forbes ₁ , Yurij Mozharivskyj ₂

Affiliation

Rare-earth-based pnictide oxides (RE,Ca)_mPn_nO_m (Pn = Sb, Bi) adopt a variety of interrelated structures based on specific stacking sequences of rare-earth oxide sublattices. These phases are all prepared via high temperature reactions and may be selectively produced in high purity. X-ray single crystal studies also revealed the disorder of pnictogen atoms in the non-charge balanced structures, which gives rise to unexpected physical properties. It is theorized that Anderson localization of the Pn p states results in an activation energy which forces semiconductor-type behavior in these phases. Interestingly, the extent of the localization of states is directly dependent on the magnitude of the disorder of the pnictogen atom, which also depends on pnictogen and/or the rare-earth atom that is used. By altering the composition of the sample with respect to the choice of Pn and/or RE, the physical properties of these select phases may be tuned to the desirable level without a change to the overall structure. The progression of this series of phases with respect to chemistry, structure, and physical properties is reviewed and discussed.

中文翻译：

稀土氧化物（RE，Ca）_m Pn _n O _m（Pn = Sb，Bi）：晶体结构，化学，组成和物理性质的综述

基于稀土氧化物亚晶格的特定堆积顺序，基于稀土的氧化物氧化物（RE，Ca）_m Pn _n O _m（Pn = Sb，Bi）采用多种相互关联的结构。这些相都是通过高温反应制备的，可以有选择地以高纯度生产。X射线单晶研究还揭示了非电荷平衡结构中光子原子的无序性，这导致了意想不到的物理性能。从理论上讲，Pn p的Anderson局部化状态导致活化能，迫使这些阶段的半导体类型的行为。有趣的是，状态局部化的程度直接取决于光生原原子的无序程度，这也取决于光生原和/或所使用的稀土原子。通过相对于Pn和/或RE的选择改变样品的组成，可以将这些选择相的物理性质调节到期望的水平，而不改变整体结构。在化学，结构和物理性质方面，对这一系列阶段的进展进行了回顾和讨论。

更新日期：2017-11-15

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