TY - JOUR
T1 - Novel polymorphic phase of BaCu2As2
T2 - Impact of flux for new phase formation in crystal growth
AU - Wu, Hanlin
AU - Li, Sheng
AU - Wu, Zheng
AU - Wang, Xiqu
AU - Ofenstein, Gareth A.
AU - Kwon, Sunah
AU - Kim, Moon J.
AU - Chu, Paul C.W.
AU - Lv, Bing
N1 - Funding Information:
This work at University of Texas at Dallas is supported by US Air Force Office of Scientific Research Grant Nos. FA9550-15-1-0236 and FA9550-19-1-0037. This project is also partially funded by NSF-DMREF-1921581 and the University of Texas at Dallas Office of Research through the Core Facility Voucher and Seed Program for Interdisciplinary Research (SPIRe) Program. The work performed at the Texas Center for Superconductivity at the University of Houston is supported in part by US AFOSR, the T. L. L. Temple Foundation, the John J. and Rebecca Moores Endowment, and the State of Texas through the Texas Center for Superconductivity. M.K. was supported in part by the Louis Beecherl, Jr. Endowment Funds and Global Research and Development Center Program (2018K1A4A3A01064272) and Brain Pool Program (2019H1D3A2A01061938) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT.
Funding Information:
This work at University of Texas at Dallas is supported by US Air Force Office of Scientific Research Grant Nos. FA9550-15-1-0236 and FA9550-19-1-0037. This project is also partially funded by NSF-DMREF-1921581 and the University of Texas at Dallas Office of Research through the Core Facility Voucher and Seed Program for Interdisciplinary Research (SPIRe) Program. The work performed at the Texas Center for Superconductivity at the University of Houston is supported in part by US AFOSR, the T. L. L. Temple Foundation, the John J. and Rebecca Moores Endowment and the State of Texas through the Texas Center for Superconductivity. M.K. was supported in part by the Louis Beecherl, Jr. Endowment Funds and Global Research and Development Center Program (2018K1A4A3A01064272) and Brain Pool Program (2019H1D3A2A01061938) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT.
Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/9/2
Y1 - 2020/9/2
N2 - 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.
AB - 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.
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U2 - 10.1021/acs.cgd.0c00614
DO - 10.1021/acs.cgd.0c00614
M3 - Article
AN - SCOPUS:85092216422
SN - 1528-7483
VL - 20
SP - 5922
EP - 5930
JO - Crystal Growth and Design
JF - Crystal Growth and Design
IS - 9
ER -