HIGH-PURITY LEAD IODIDE FOR CRYSTAL-GROWTH AND ITS CHARACTERIZATION

被引：21
|
作者：
ECKSTEIN, J
ERLER, B
BENZ, KW
机构：
[1] Kristallographisches Institut der Universität, D-7800 Freiburg
来源：
MATERIALS RESEARCH BULLETIN | 1992年 / 27卷 / 05期
关键词：
LEAD IODIDE;
D O I：
10.1016/0025-5408(92)90141-L
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
High purity lead iodide (PbI2) is prepared by precipitation of lead nitrate (Pb(NO3)) and potassium iodide (KI) solutions. Thoroughly dried PbI2 is then zone refined. The main impurity causing a strong adherence of solidified melt to the glass ampoule wall is identified to be lead-hydroxyl-iodate (Pb(OH)I). In order to decrease the OH- concentration and consequently the deviation from stoichiometry, molten PbI2 is treated with a gaseous mixture of methylene-iodide (CH2I2) and iodethane (C2H5I). The criterion for the efficiency of this scavenging process is the removal of the adhesive effect; thus, the solidified PbI2 ingot can move freely in the ampoule. A wet chemical analytic method to determine the deviations from stoichiometry is described.
引用
收藏
页码：537 / 544
页数：8
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