红外非线性晶体CdGeAs2多晶合成

Synthesis of Infrared Nonlinear Optical Crystal CdGeAs_2 Polycrystal

高纯度的多晶对生长优质单晶起着至关重要的作用。原料对石英坩埚的腐蚀,以及偏离化学计量生成的二元、三元中间相均会严重影响CdGeAs_2多晶的纯度和质量。本文以载气携带丙酮在石英坩埚内壁镀上高质量碳膜,解决了原料对石英坩埚的腐蚀问题;并在双温区炉中设计了合理的温场,合成了CdGeAs_2多晶料。经X射线粉末衍射分析和晶胞精修表明样品为高纯、单相CdGeAs_2多晶。

High-purity polycrystalline plays a vital role in growing high quality single crystals. Both of raw quatz crucible corrosion and binary and ternary intermediate phase since deviation from the stoichiometry will seriously affect the purity and quality of CdGeAs2 polycrystal. In this paper,the problem of raw quatz crucible corrosion was solved with carbon coating in the quartz crucible by carrier gas carrying acetone.And the CdGeAs2 polycrystal was synthesized in two-temperature zone furnace with the rational design of temperature field. The results of the X-ray powder diffraction spectrum and cell refinement indicate that the polycrystalline materials are high-purity CdGeAs2 polycrystals with single phase.