BaCu2MIVQ4 (MIV = Si, Ge, and Sn; Q = S, Se): synthesis, crystal structures, optical performances and theoretical calculations
BaCu2MIVQ4 (MIV = Si, Ge, and Sn; Q = S, Se): synthesis, crystal structures, optical performances and theoretical calculations
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BaCu2MIVQ4（MIV = Si、Ge 和 Sn；Q = S、Se）：合成、晶体结构、光学性能和理论计算
DOI：
10.1039/c7ra05022d
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发表时间：
2017-06
期刊：
影响因子：
3.9
通讯作者：
Shilie Pan
中科院分区：
文献类型：
--
作者：
Leyan Nian;Junben Huang;Kui Wu;Zhi Su;Zhihua Yang;Shilie Pan
Five non-centrosymmetric (NCS) quaternary metal chalcogenides, BaCu2SiSe4, BaCu2GeS4, BaCu2GeSe4, BaCu2SnS4, and BaCu2SnSe4, were successfully synthesized by solid-state reaction in vacuum-sealed silica tubes. They crystallized in the three different space groups: Ama2 for BaCu2SnSe4, P3121 for BaCu2GeS4 and BaCu2GeSe4, and P3221 for BaCu2SiSe4 and BaCu2SnS4. Note that BaCu2GeS4 and BaCu2GeSe4 show the mirror symmetrical structures to those of BaCu2SiSe4 and BaCu2SnS4. In comparison with their structures, it can be found that the [CuSe4] units are connected together to form a two-dimensional (2D) layer structure in BaCu2SnSe4, which is different from the 3D framework structure formed by the interlinked [CuQ4] (Q = S and Se) units in other four title compounds. In addition, BaCu2SnSe4 exhibits only one type of tunnel structure with the isolated [BaSe8] units existing in each tunnel, which is also different from the other title compounds (two types of tunnels with the isolated [BaSe8] units and [BaSe6]n chains located). The interesting structural changes also indicate that slight change of cation size would result in different structure features, and future structure prediction should devote considerable attention to the different chalcogen atoms. Moreover, important optical properties (optical bandgap, infrared (IR) absorption edge, second harmonic generation (SHG) response) of the title compounds were systematically investigated. Among them, IR and Raman spectra indicate that all of them exhibit the wide IR absorption edges (∼22 μm). Powder SHG measurement shows that BaCu2SnS4 possesses good SHG response about 1.6 times that of benchmark AgGaS2 (AGS) at the particle size 55–88 μm. All results indicate that BaCu2SnS4 can be expected as a potential IR nonlinear optical (NLO) candidate. Theoretical calculation was also used to analyze the structure–property relationship and their electronic structures and origin of NLO effect were studied in detail.
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DOI：
10.1002/anie.201602317
发表时间：
2016
期刊：
Angewandte Chemie International Edition
影响因子：
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作者：
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通讯作者：
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作者：
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DOI：
10.1002/zaac.19764260308
发表时间：
1976-10
期刊：
Zeitschrift für anorganische und allgemeine Chemie
影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
JAYARAMAN, A;NARAYANAMURTI, V;MAINES, RG
通讯作者：
MAINES, RG