Synthesis, crystal structure, linear and nonlinear optical properties of quaternary sulfides $Ba_6$$(Cu_2X)$$Ge_4$$S_{16}$ $(X=Mg, Mn, Cd)$
Cicirello, Gary Wu, Kui Wang, Jian
Cicirello, Gary
Wu, Kui
Wang, Jian
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2021-08-01
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Sulfides,Synthesis,Crystal structure,Band gap engineering,Nonlinear optical properties
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Cicirello, G., Wu, K., & Wang, J. (2021). Synthesis, crystal structure, linear and nonlinear optical properties of quaternary sulfides Ba6(Cu2X)Ge4S16 (X=Mg, mn, cd). Journal of Solid State Chemistry, 300 doi:10.1016/j.jssc.2021.122226
Abstract
Three new quaternary noncentrosymmetric sulfides, $Ba_6$$(Cu_{1.9}$$4Mg_{1.1})$$Ge_4$$S_{16,}$ $Ba_6$$(Cu_{2.2}$$Mn_{0.8})$$Ge_4$$S_{16,}$ and $Ba_6$($Cu_{1.6}$$Cd_{1.4}$)$Ge_4$$S_{16,}$ have been synthesized by a high-temperature solid-state method and flux growth method. The crystal structures of the compounds have been determined by single crystal X-ray diffraction. All compounds are isostructural and crystallize in the $Ba_6$$Ag_4$$Sn_4$$S_{16}$ structure type and the cubic space group I ͞43d (No. 220) with unit cell parameters of a = 14.308 Å ($Ba_6$($Cu_{1.9}$$Mg_{1.1}$)$Ge_4$$S_{16}$), a = 14.299 (2) Å ($Ba_6$($Cu_{2.2}$$Mn_{0.8}$)$Ge_4$$S_{16}$), and a = 14.336 (2) Å ($Ba_6$($Cu_{1.6}$$Cd_{1.4}$)$Ge_4$$S_{16}$). The structure demonstrates good structural flexibility of mixing occupancy between Cu and X (X = Mg, Mn, Cd) at the Wyckoff site 12a. The structure consists of a distorted 3-dimensional framework constructed by (Cu/X)$S_4$ and $GeS_4$ tetrahedra. The divalent metals doped into the structure tune the band gaps of the compounds and contribute to good Second Harmonic Generation (SHG) response and high Laser Damage Threshold (LDT).
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Elsevier
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Journal of Solid State Chemistry;Vol. 300
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0022-4596