| Autor: |
Babizhetskyy, Volodymyr, Levytskyy, Volodymyr, Smetana, Volodymyr, Wilk-Kozubek, Magdalena, Tsisar, Oksana, Piskach, Lyudmyla, Parasyuk, Oleg, Mudring, Anja-Verena |
| Zdroj: |
Zeitschrift für Naturforschung B; February 2020, Vol. 75 Issue: 1-2 p135-142, 8p |
| Abstrakt: |
Two new quaternary selenides of the α-TlSe structure type have been synthesized and characterized. Single crystal X-ray diffraction analysis has revealed that Tl2Ga2SnSe6crystallizes with space group I4/mmc, a= 8.095(1), c= 6.402(1) Å, with a refined composition of Tl1−xGa1−ySnySe2(x= y= 0.345(5)), Z= 4, R1 = 0.028; wR2 = 0.066. The crystal structure of the isostructural compound Tl2Ga2GeSe6has been determined by means of powder X-ray diffraction: space group I4/mmc, Z = 4, a = 8.0770(4), c = 6.2572(5) Å, refined composition Tl1−xGa1−yGeySe2, x = 0.343(5), y = 0.35(2), (RB(I)= 0.084; RP= 0.041; RPw= 0.058). According to their optical absorption spectra all compounds are semiconductors with relatively narrow direct band gaps of 2.15(3) and 2.05(5) eV for the Ge and Sn phase, respectively. |
| Databáze: |
Supplemental Index |
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