Synthesis and Characterization of new Chalcogenometallate Materials in the Systems Alkali Metal - Gallium - Tetrel - Chalcogen

本研究计划的主要目标在于合成和表征碱金属、镓、四元和硫属元素四元体系中的新半导体。与三元13族和14族化合物相反，这些混合材料显示出有趣的物理性质，特别是在非线性光学领域。以三元硫属镓酸盐为出发点，将进一步研究这些与重碱金属结合的四元硫属镓酸盐。基于对白垩系元素的深入研究，非线性光学活性物质有望与较轻的元素结合。与较重的元素结合，这些材料应该显示热电性能。此外，这些化合物应该适合于检测硬辐射，因为它们的高吸收系数与相对高的光学带隙相结合应该产生具有低背景噪声的检测器材料。为了制备这些化合物，除了传统的固态方法之外，多硫族化物焊剂中的反应将用作补充合成路线。

The main goal of this research project lies in the synthesis und characterization of new semiconductors in the quaternary systems of alkali metal, gallium, tetrel, and chalcogen. Contrary to the ternary group 13 and group 14 compounds, these mixed materials show interesting physical properties, especially in the field of non-linear optics. Using ternary chalcogenogallates as a starting point, these quaternary chalcogenogallattetrelates combined with the heavy alkali metals will be further investigated. Based on the knowledge of the better investigated chalkogenoindattetrelates, non-linear optically active substances are expected in combination with lighter elements. In combination with the heavier elements, these materials should show thermoelectric properties. Furthermore, these compounds should be suitable for the detection of hard radiation, as their high absorption coefficients combined with relatively high optical band gaps should yield detector materials with low background noise. In order to prepare these compounds, reactions in polychalcogenide fluxes will be used as a complementary synthesis route in addition to traditional solid state methods.