Bulk Synthesis and Superconductivity of Rock Salt-Type, Nitrogen-Rich, Zirconium-Deficient Nitrides, Zr1–xN

IF 7.2 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Chemistry of Materials Pub Date : 2025-05-10 DOI:10.1021/acs.chemmater.5c0017510.1021/acs.chemmater.5c00175

Masashi Tanaka*, Masaya Fujioka, Duncan H. Gregory and Kei Inumaru,

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Abstract

Zirconium nitrides were derived from crystalline powders of layer-structured ZrNCl via ammonothermal dechlorination at various temperatures under flowing ammonia gas. Regardless of which polymorph of ZrNCl was employed as a starting material, the products of the ammonothermal dechlorination reactions were zirconium nitride powders with the rock salt structure. The size of the cubic lattice parameter was found to be dependent on the ammonia flow rate. Each of the synthesized zirconium nitrides is nonstoichiometric and nitrogen-rich (zirconium-deficient), Zr_1–xN, and some exhibit superconductivity at subambient temperature. The superconducting transition temperature (T_c) of each of the nitrides scales linearly with the corresponding cubic unit cell volume (lattice parameter, a) and the N/Zr ratio. This paper represents the first report of a superconducting dome in bulk nitrogen-rich zirconium nitrides with a rock-salt-type structure; to date, a unique characteristic among superconducting rock salt phases.

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岩盐型富氮缺锆氮化物的体合成与超导性

采用氨热脱氯法制备了层状结构的ZrNCl结晶粉末，在不同温度下，在流动的氨气条件下制备了氮化锆。无论采用哪种ZrNCl晶型作为起始原料，氨热脱氯反应的产物都是具有岩盐结构的氮化锆粉末。发现立方晶格参数的大小与氨流速有关。每一种合成的氮化锆都是非化学计量的，富氮（缺锆），Zr1-xN，一些在亚环境温度下表现出超导性。每种氮化物的超导转变温度（Tc）与相应的立方晶胞体积（晶格参数，a）和N/Zr比成线性关系。本文首次报道了块状富氮氮化锆中具有岩盐型结构的超导圆顶；迄今为止，在超导岩盐相中有一个独特的特点。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemistry of Materials 工程技术-材料科学：综合

CiteScore

14.10

自引率

5.80%

发文量

929

审稿时长

1.5 months

期刊介绍： The journal Chemistry of Materials focuses on publishing original research at the intersection of materials science and chemistry. The studies published in the journal involve chemistry as a prominent component and explore topics such as the design, synthesis, characterization, processing, understanding, and application of functional or potentially functional materials. The journal covers various areas of interest, including inorganic and organic solid-state chemistry, nanomaterials, biomaterials, thin films and polymers, and composite/hybrid materials. The journal particularly seeks papers that highlight the creation or development of innovative materials with novel optical, electrical, magnetic, catalytic, or mechanical properties. It is essential that manuscripts on these topics have a primary focus on the chemistry of materials and represent a significant advancement compared to prior research. Before external reviews are sought, submitted manuscripts undergo a review process by a minimum of two editors to ensure their appropriateness for the journal and the presence of sufficient evidence of a significant advance that will be of broad interest to the materials chemistry community.