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Indexed by:Journal Papers

Date of Publication:2020-01-30

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:EI、SCIE

Volume:815

ISSN No.:0925-8388

Key Words:Solvothermal method; Quaternary Ag-Containing sulfides; Alkaline earth metal; Photocurrent response

Abstract:Four quaternary silver sulfides, Ba2AgInS4 (1), Ba3Ag2Sn2S8 (2), BaAg2MS4 (M = Sn for 3; Ge for 4) have been synthesized solvothermally in the presence of excess sulfur as mineralizer. Compound 1 features a 2 2-D-infinity(2)[AgInS4](4-) layer structure composed of AgS4/InS4 tetrahedra, in which the two metals randomly occupy one crystallographic unique position with the molar ratio of 1:1. Compound 2 possesses a 3-D [Ag2Sn2S8](6-) framework which constructed by alternative arrangements between AgS4 and SnS(4)tetrahedra by sharing vertexes. The structures of compounds 3 and 4 are similar and exhibit 3-D anionic [Ag2MS4](2-) (M = Sn for 3; Ge for 4) framework composed of AgS2 layers and monomeric MS4(M = Sn, Ge) tetrahedra that pillar the above layers. Moreover, semiconducting properties (optical bandgap, photoelectric response) of the title compounds were also investigated. The results indicate that all the quaternary sulfides are narrow-gap semiconductors, and compound 3 exhibits excellent photocurrent responsive property. (C) 2019 Published by Elsevier B.V.