The influence of concentration and supersaturation ratio of CuI·HI on CuI crystal growth by decomplexation method
The influence of concentration and supersaturation ratio of CuI·HI on CuI crystal growth by decomplexation method
复制标题
DOI：
10.1002/crat.200900471
复制
发表时间：
2010-04
影响因子：
1.5
通讯作者：
M. Gu;Pan Gao;Xiaolin Liu;Shi-ming Huang;Bo Liu;Chen Ni;Rongkun Xu;J. Ning
中科院分区：
文献类型：
--
作者：
M. Gu;Pan Gao;Xiaolin Liu;Shi-ming Huang;Bo Liu;Chen Ni;Rongkun Xu;J. Ning
溶质的溶解度和过饱和度对于溶液中晶体生长的基本作用已被广泛认识到。为了优化HI酸中CuI·HI解络生长CuI晶体的工艺，测量了CuI在HI-H2O混合溶剂中的溶解度和过饱和度曲线，并设计了改进的浓度编程方案，成功生长了边缘2.5 mm的高质量CuI单晶。该方案利用分光光度计测量了CuI·HI络合物和HI酸在硅胶中沿扩散方向的浓度分布，并分析了CuI·HI络合物过饱和度的变化。研究发现，过量的CuI·HI络合物浓度会导致高过饱和度并形成CuI枝晶。硅胶中规则CuI单晶生长条件为：当晶核出现时，HI-H2O溶剂中CuI·HI络合物浓度应保持在0.033~0.050 mol/L范围内，相应的过饱和度为1.24~1.45，然后分别降至0.025~0.033 mol/L和晶体生长阶段1.14-1.26。研究结果可为进一步改进实验方案提供有用的线索。 （© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA，魏因海姆）
The fundamental role of solubility and supersaturation of solute for crystal growth from solution has been widely realized. In order to optimize the process of CuI crystal growth by CuI·HI decomplexation in HI acid, the solubility and supersaturation curves of CuI in HI‐H2O mixed solvent were measured, and then a modified concentration programming scheme was designed, which could grow high quality CuI single crystals of 2.5 mm on edge successfully. In this scheme, the concentration distribution of CuI·HI complex and HI acid in silica gel along their diffused direction were measured with spectrophotometer, and the evolution of CuI·HI complex supersaturation ratio was analysed. It was found that the excess CuI·HI complex concentration would lead to the high supersaturation ratio and the formation CuI dendrites. The condition for regular CuI single crystal growth in silica gel was measured as follow: when the crystal nuclei appears, the CuI·HI complex concentration in HI‐H2O solvent should be kept in the range of 0.033–0.050 mol/L and its corresponding supersaturation ratio is 1.24–1.45, and then they should be respectively declined to a range of 0.025–0.033 mol/L and 1.14–1.26 at the stage of crystal growth. The results may provide a useful clue for further improvement of the experimental scheme. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)