Remarkable effects of local structure in tantalum and niobium oxynitrides

IF 9.1 2区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR Progress in Solid State Chemistry Pub Date : 2018-09-01 DOI:10.1016/j.progsolidstchem.2017.08.001
Shinichi Kikkawa, Akira Hosono, Yuji Masubuchi
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引用次数: 7

Abstract

Compounds that contain two types of anion are attracting attention as a new field of solid state chemistry. The nitride anion is similar to the oxide anion in size and nature. They coordinate together to cations in oxynitrides to form characteristic local structures around them in a certain way. Special properties induced by the specific local structure have been observed in oxynitrides. Ferroelectricity was identified in oxynitride perovskites, especially those of tantalum, because the oxide and nitride anions form a polar ordered local crystal structure around Ta5+ in the 5d0 electron configuration. The critical current density in superconductivity was enhanced by the formation of clusters in niobium oxynitrides with the rocksalt-type structure. Main group elements doped into the niobium oxynitrides, especially silicon, are coordinated mainly by oxides with some amount of nitrides to form silicon oxide-like clusters. The niobium in the oxynitride has some 4d electrons to maintain the superconductivity in the niobium oxynitride host. Here, the preparation, crystal structure and properties of oxynitrides formed with tantalum and niobium are reviewed.

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氮化钽和氮化铌中局部结构的显著影响
含两种阴离子的化合物作为固体化学的一个新领域正受到人们的关注。氮阴离子在大小和性质上与氧化阴离子相似。它们与氮氧化物中的阳离子配合,以某种方式在它们周围形成特有的局部结构。在氮氧化物中观察到由特定局部结构引起的特殊性能。铁电性在氮氧钙钛矿中被发现,特别是在钽钙钛矿中,因为氧化物和氮离子在5d0电子构型中围绕Ta5+形成极性有序的局部晶体结构。具有岩盐型结构的氧化氮化铌簇的形成提高了超导临界电流密度。氧化氮化铌中掺杂的主要族元素,尤其是硅,主要与氧化物配位,形成类氧化硅簇。氮化氧中的铌具有四维电子,以维持氮化氧中铌的超导性。本文综述了钽和铌合成氮氧化物的制备方法、晶体结构和性能。
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来源期刊
Progress in Solid State Chemistry
Progress in Solid State Chemistry 化学-无机化学与核化学
CiteScore
14.10
自引率
3.30%
发文量
12
期刊介绍: Progress in Solid State Chemistry offers critical reviews and specialized articles written by leading experts in the field, providing a comprehensive view of solid-state chemistry. It addresses the challenge of dispersed literature by offering up-to-date assessments of research progress and recent developments. Emphasis is placed on the relationship between physical properties and structural chemistry, particularly imperfections like vacancies and dislocations. The reviews published in Progress in Solid State Chemistry emphasize critical evaluation of the field, along with indications of current problems and future directions. Papers are not intended to be bibliographic in nature but rather to inform a broad range of readers in an inherently multidisciplinary field by providing expert treatises oriented both towards specialists in different areas of the solid state and towards nonspecialists. The authorship is international, and the subject matter will be of interest to chemists, materials scientists, physicists, metallurgists, crystallographers, ceramists, and engineers interested in the solid state.
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