U型坩埚上升法生长碘化铅单晶体

Growth of PbI_2 Single Crystal with Ascending U Type Ampoule

碘化铅(PbI2)晶体是一种性能优异的室温核辐射探测器材料。由于铅、碘化铅和碘三种物质的蒸汽压差很大,很难生长出优质的碘化铅单晶体。本文根据碘化铅熔体容易分解及Pb-I系统中熔体分层的特性,设计制作了新型的生长坩埚,并采用U型坩埚上升法生长出了橘黄色、半透明状的碘化铅晶体,初步测得其电阻率为1.7×1012Ω.cm,红外透过率为45%。

Lead Iodide(PbI2) crystal is one of the advanced materials for fabricating of room temperature nuclear radiation detectors,but it is very difficulty to prepare excellent PbI2 single crystal because of the great vapor pressure difference of lead,lead iodide and iodine.Based on the decomposing characteristic of lead iodide melt and the immiscible phenomenon in Pb-I melt system,a new U type ampoule has been designed,by which,PbI2 single crystal with orange appearance and translucent has been grown,its resistivity 1.7×1012Ω·cm and infrared transmission 45% has been measured primarily,too.