Synthesis, structure, and properties of Li2In2MQ6 (M = Si, Ge; Q = S, Se): a new series of IR nonlinear optical materials.
Synthesis, structure, and properties of Li2In2MQ6 (M = Si, Ge; Q = S, Se): a new series of IR nonlinear optical materials.
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DOI：
10.1021/ic300373z
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发表时间：
2012-05
影响因子：
4.6
通讯作者：
Wenlong Yin;Kai Feng;Wenyu Hao;Jiyong Yao;Yicheng Wu
中科院分区：
文献类型：
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作者：
Wenlong Yin;Kai Feng;Wenyu Hao;Jiyong Yao;Yicheng Wu
首次合成了Li(2)In(2)MQ(6)四个同构化合物（M = Si, Ge; Q = S, Se）。它们在非中心对称的单斜空间群Cc中结晶，其三维框架由共享角的LiQ(4)、InQ(4)和MQ(4)四面体组成。当基波波长为2090 nm的激光探测时，两种硫化物和两种硒化物的二次谐波信号强度分别接近AgGaS(2)和AgGaSe(2)。它们具有较大的带隙，Li(2)In(2)SiS(6)为3.61(2)eV, Li(2)In(2)GeS(6)为3.45(2)eV, Li(2)In(2)SiSe(6)为2.54(2)eV, Li(2)In(2)GeSe(6)为2.30(2)eV。此外，这四种化合物都在相对较低的温度下完全熔化，这使得通过Bridgman-Stockbarger方法生长实际应用所需的大块晶体成为可能。
The four isostructural compounds Li(2)In(2)MQ(6) (M = Si, Ge; Q = S, Se) have been synthesized for the first time. They crystallize in the noncentrosymmetric monoclinic space group Cc with the three-dimensional framework composed of corner-sharing LiQ(4), InQ(4), and MQ(4) tetrahedra. The second-harmonic-generation signal intensities of the two sulfides and two selenides were close to those of AgGaS(2) and AgGaSe(2), respectively, when probed with a laser with 2090 nm as the fundamental wavelength. They possess large band gaps of 3.61(2) eV for Li(2)In(2)SiS(6), 3.45(2) eV for Li(2)In(2)GeS(6), 2.54(2) eV for Li(2)In(2)SiSe(6), and 2.30(2) eV for Li(2)In(2)GeSe(6), respectively. Moreover, these four compounds all melt congruently at relatively low temperatures, which makes it feasible to grow bulk crystals needed for practical application by the Bridgman-Stockbarger method.