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