Synthesis and properties of Sr₂La₂NiW₂O₁₂, a new S = 1 triangular lattice magnet.

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-10-01 Epub Date: 2024-08-30 DOI:10.1107/S2052520624007091

Anastasiia Smerechuk, Ana Guilherme Buzanich, Bernd Büchner, Sabine Wurmehl, Ryan Morrow

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Abstract

Magnetic materials featuring triangular arrangements of spins are frequently investigated as platforms hosting magnetic frustration. Hexagonal perovskites with ordered vacancies serve as excellent candidates for two-dimensional triangular magnetism due to the considerable separation of the magnetic planes. In this work, the effects of chemical pressure on the ferromagnetic ground state of Ba₂La₂NiW₂O₁₂ by substitution of Ba²⁺ with Sr²⁺ to produce Sr₂La₂NiW₂O₁₂ are investigated. The two materials are characterized using synchrotron-based XRD, XANES and EXAFS in addition to magnetometry in order to correlate their crystal structures and magnetic properties. Both materials form in space group R3, yet as a result of the enhanced bending of key bond angles due to the effects of chemical pressure, the T_C value of the magnetic Ni²⁺ sublattice is reduced from ∼6 K in Ba₂La₂NiW₂O₁₂ to 4 K in Sr₂La₂NiW₂O₁₂.

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新型 S = 1 三角晶格磁体 Sr2La2NiW2O12 的合成与特性。

以三角形自旋排列为特征的磁性材料经常被研究作为承载磁挫折的平台。具有有序空位的六方包晶石因磁性平面之间有相当大的间隔而成为二维三角磁性的绝佳候选材料。在这项研究中，通过用 Sr2+ 替代 Ba2+ 生成 Sr2La2NiW2O12，研究了化学压力对 Ba2La2NiW2O12 铁磁基态的影响。除了磁力测定法之外，还使用同步辐射 XRD、XANES 和 EXAFS 对这两种材料进行了表征，以便将它们的晶体结构和磁性能联系起来。这两种材料都形成 R3 空间群，但由于化学压力的影响导致关键键角的弯曲增强，磁性 Ni2+ 亚晶格的 TC 值从 Ba2La2NiW2O12 中的 ∼6 K 降至 Sr2La2NiW2O12 中的 4 K。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.