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- W2950265596 abstract "The Cs-Cu-Q (Q = S, Se) system has been investigated using copper metal, cesium chloride, and alkali-metal polychalcogenide salts under mild hydrothermal reaction conditions. Heteropolychalcogenide salts and mixtures of known polysulfide and polyselenide salts have been used as reagents. The reaction products contain the alpha-CsCuQ(4) and CsCuQ(6) structures. The alpha-CsCuQ(4) phase exhibits a smooth transition in lattice parameters from the pure sulfur to the pure selenium phases, based on Vegard's law. The CsCuQ(6) phase has been prepared as the pure sulfur analog and a selenium rich analog. The single-crystal structures of the disordered compounds alpha-CsCuS(2)Se(2) (P2(1)2(1)2(1), Z = 4, a = 5.439(1) Å, b = 8.878(2) Å, c = 13.762(4) Å) and CsCuS(1.6)Se(4.4) (P&onemacr;, Z = 2, a = 11.253(4) Å, b = 11.585(2) Å, c = 7.211(2) Å, alpha = 92.93 degrees, beta = 100.94 degrees, gamma = 74.51 degrees ) have been solved using a correlated-site occupancy model. These disordered structures display a polychalcogenide geometry in which the sulfur atoms prefer positions that are bound to copper. The optical absorption spectra of these materials have been investigated. The optical band gap varies as a function of the sulfur-selenium ratio. Extended Hückel crystal orbital calculations have been performed to investigate the electronic structure and bonding in these compounds in an attempt to explain the site distribution of sulfur and selenium." @default.
- W2950265596 created "2019-06-27" @default.
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- W2950265596 date "1996-01-01" @default.
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- W2950265596 title "Synthesis, Characterization, and Bonding of Two New Heteropolychalcogenides: α-CsCu(S<i><sub>x</sub></i>Se<sub>4-<i>x</i></sub>) and CsCu(S<i><sub>x</sub></i>Se<sub>6-<i>x</i></sub>)" @default.
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- W2950265596 doi "https://doi.org/10.1021/ic9516370" @default.
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