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首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >The mixed lanthanum dichalcogenide β-LaS_(1.86(1))Se _(0.14(1)). Synthesis, crystal structure, Raman spectrum and optical band gap
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The mixed lanthanum dichalcogenide β-LaS_(1.86(1))Se _(0.14(1)). Synthesis, crystal structure, Raman spectrum and optical band gap

机译:混合二卤化镧β-LaS_(1.86(1))Se_(0.14(1))。合成,晶体结构,拉曼光谱和光学带隙

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摘要

The ternary lanthanum sulfide selenide β-LaS_(1.86(1))Se _(0.14(1)) was obtained by reaction of the elements in an NaCl flux. The new compound adopts the β-LnS_2 structure type and crystallizes in the orthorhombic space group Pnma (no. 62) with lattice parameters of a = 814.77(1), b = 1638.46(1) and c = 413.88(1) pm. Raman lines indicate the presence of mixed (S_(1-y)Se_y)~(2-) dianions with y ≈ 0.14, besides the well known S_2~(2-) dianions. The band gap of β-LaS_(1.86(1))Se_(0.14(1)) is 2.5 eV as determined by optical spectroscopy.
机译:通过使元素在NaCl助熔剂中反应获得三元硫化硒硒化物β-LaS_(1.86(1))Se _(0.14(1))。新化合物采用β-LnS_2结构类型,并在晶格参数为a = 814.77(1),b = 1638.46(1)和c = 413.88(1)pm的正交晶体空间群Pnma(编号62)中结晶。拉曼线表示除了众所周知的S_2〜(2-)阴离子外,还存在y≈0.14的混合(S_(1-y)Se_y)〜(2-)阴离子。通过光谱法测定,β-LaS_(1.86(1))Se_(0.14(1))的带隙为2.5eV。

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