Title: | Synthesis and characterization of new quaternary polyselenide Ba4TMSbSe12 (TM = Nb, Ta) |
Authors: | Chung, Ming-Yan Chen, Guan-Ruei Lee, Chi-Shen 交大名義發表 應用化學系 National Chiao Tung University Department of Applied Chemistry |
Keywords: | crystal structure;quaternary selenide;Se-Se bond |
Issue Date: | 1-Sep-2019 |
Abstract: | Two new quaternary polyselenides, Ba4TMSbSe12 (TM = Nb, Ta), are synthesized using a solid state reaction. They crystallize in a new structural type with a P-1 triclinic space group, characterized according to single-crystal X-ray diffraction. The structure is alternately stacked using isolated NbSe95- and SbSe33-, which are separated by Ba2+. The structure contains the NbSe95- unit with a bipentagonal pyramidal shape coordinated with Se2- and Se-2(2-) in monodenteate and bidentate modes. The vibrational property of the diselenide Se-2(2-) unit was studied using Raman spectrum analysis. ultraviolet-visible diffused reflectance and temperature-dependent resistivity measurements indicate semiconductor behaviors. Calculations of electronic structures indicate the presence of a band gap and strong Se-Se interactions in the diselenide group, which experimentally supports the measured physical properties. |
URI: | http://dx.doi.org/10.1002/jccs.201900174 http://hdl.handle.net/11536/153107 |
ISSN: | 0009-4536 |
DOI: | 10.1002/jccs.201900174 |
Journal: | JOURNAL OF THE CHINESE CHEMICAL SOCIETY |
Volume: | 66 |
Issue: | 9 |
Begin Page: | 1072 |
End Page: | 1077 |
Appears in Collections: | Articles |