Study On Polycrystal Synthesis And Single Crystal Growth Of Lead Iodide

Lead iodide (PbI₂) crystal is one of the most promising room nuclear radiation detector materials. It can be used for detecting γ-ray and α-ray of 1KeV-1MeV, and can be used on making large area X-ray imaging array. PbI₂ crystal has a wide band gap, high room temperature resistivity, large atomic numbers and mobility life product of carriers. So, PbI₂ detector has high energy resolution and good detecting efficiency. In comparison with others, PbI₂ detector can be used and kept on a larger temperature range of —200℃～130℃. Therefore, PbI₂ crystal has been more and more attractive lately.Presently, there are not many oversea reports about PbI₂, which focuses mostly on PbI₂ crystal growth and tentative fabrication of detector. Whereas, PbI₂ polycrystal synthesis and crystal growth habit have not been studied deeply by them. So, the as grown crystal and the detector fabricated from which are not satisfactory. In our country, there hasn't correlative reports published. The aim of this paper is to research deeply on the method of polycrystal synthesis and crystal growth, to explore a new craft of PbI₂ single crystal growth with high quality, and to get large size PbI₂ single crystal with good integrality to lay a foundation for study on detector fabrication.