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

IF 1.3 3区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Acta crystallographica Section B, Structural science, crystal engineering and materials 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

Acta crystallographica Section B, Structural science, crystal engineering and materials CHEMISTRY, MULTIDISCIPLINARYCRYSTALLOGRAPH-CRYSTALLOGRAPHY

CiteScore

3.60

自引率

5.30%

发文量

期刊介绍： Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials publishes scientific articles related to the structural science of compounds and materials in the widest sense. Knowledge of the arrangements of atoms, including their temporal variations and dependencies on temperature and pressure, is often the key to understanding physical and chemical phenomena and is crucial for the design of new materials and supramolecular devices. Acta Crystallographica B is the forum for the publication of such contributions. Scientific developments based on experimental studies as well as those based on theoretical approaches, including crystal-structure prediction, structure-property relations and the use of databases of crystal structures, are published.