Novel polymorphic phase of BaCu2As2: Impact of flux for new phase formation in crystal growth

Hanlin Wu, Sheng Li, Zheng Wu, Xiqu Wang, Gareth A. Ofenstein, Sunah Kwon, Moon J. Kim, Paul C.W. Chu, Bing Lv

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)

摘要

In this work, we have thoroughly studied the effects of flux composition and temperature on the crystal growth of the BaCu2As2 compound. While Pb and CuAs self-flux produce the well-known α-phase ThCr2Si2-type structure (Z = 2), a new polymorphic phase of BaCu2As2 (β-phase) with a much larger c lattice parameter (Z = 10), which could be considered an intergrowth of the ThCr2Si2- and CaBe2Ge2-type structures, has been discovered via Sn flux growth. We have characterized this structure through single-crystal X-ray diffraction, transmission electron microscopy (TEM), and scanning transmission electron microscopy (STEM) studies. Furthermore, we compare this new polymorphic intergrowth structure with the α-phase BaCu2As2 (ThCr2Si2 type with Z = 2) and the β-phase BaCu2Sb2 (intergrowth of ThCr2Si2 and CaBe2Ge2 types with Z = 6), both with the same space group I4/mmm. Electrical transport studies reveal p-type carriers and magnetoresistivity up to 22% at 5 K and under a magnetic field of 7 T. Our work suggests a new route for the discovery of new polymorphic structures through flux and temperature control during material synthesis.

原文English
頁(從 - 到)5922-5930
頁數9
期刊Crystal Growth and Design
20
發行號9
DOIs
出版狀態Published - 2020 九月 2

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 材料科學(全部)
  • 凝聚態物理學

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