New layered quaternary BaCu6Sn2As4−x and BaCu6Sn2P4−x phases: Crystal growth and physical properties

被引：0

作者：

Wu, Hanlin ^{[1
]}

Li, Sheng ^{[1
]}

Wang, Xiqu ^{[2
]}

Kwon, Sunah ^{[3
]}

Liu, Wenhao ^{[1
]}

Ofenstein, Gareth A. ^{[1
]}

Kim, Moon J. ^{[3
]}

Lv, Bing ^{[1
,3
]}

机构：

[1] Department of Physics, the University of Texas at Dallas, TX,75080, United States

[2] Department of Chemistry, University of Houston, Houston,TX,77004, United States

[3] Department of Materials Science & Engineering, The University of Texas at Dallas, Richardson,TX,75080, United States

来源：

Journal of Alloys and Compounds | 2022年 / 892卷

基金：

美国国家科学基金会; 新加坡国家研究基金会;

关键词：

High resolution transmission electron microscopy - Transmissions - Single crystals - Crystal growth - Scanning electron microscopy - Intermetallics - Crystal atomic structure - Atoms;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

We report two new quaternary BaCu6Sn2As4−x and BaCu6Sn2P4−x phases with a new structure type, which are fully characterized by single crystal X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). These two phases crystallize in tetragonal cell with space group I4/mmm (#139) and Pearson symbol tI26. The refined lattice parameters are a = 4.164(1) Å, c = 24.088(3) Å for BaCu6Sn2As4−x, and a = 4.053(2) Å, c = 24.08(1) Å for BaCu6Sn2P4−x, respectively. They possess a distinct layered feature composed of Cu6Sn2Pnx (Pn = P, As) layers sandwiched by the Ba atoms. The Cu-Sn framework of the Cu6Sn2Pnx layer is closely related to the well-known Cu2Sb-type structure, and Pn atoms are found occupying two interstitial sites caused by close packing of Cu and Sn atoms or capped on the top of square nets formed by Cu atoms. The compounds are also characterized by electrical transport measurements down to 2 K. © 2021 Elsevier B.V.

引用

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