中子探测用LiInSe2晶体生长及表征张哲人1,朱孟花1,2,徐亚东1,2(1.西北工业大学凝固技术国家重点实验室,陕西西安710072;2.西北工业大学材料学院,陕西西安710072)摘要:LiInSe2晶体是一种可在室温下探测热中子的新型半导体中子探测材料。本文采用低温合成法,获得大量高纯多晶LiInSe2原料,通过改进生长工艺得到了高质量的红色LiInSe2晶体。通过研究晶体的透过率、夹杂相等,表征了晶体的生长质量,测试晶体对α粒子的响应来研究晶体进行中子探测的可能性。结果表明,晶体的红外透过率为75%,禁带宽度为2.3eV,夹杂相密度达到2900个/cm2,夹杂相的尺寸在1~10μm左右。测得电阻率在5×1011Á·cm左右,对α粒子的能量分辨率为55%。关键词:热中子探测;LiInSe2;晶体生长;α粒子响应中图分类号:O78文献标识码:A文章编号:1000-8365(2023)01-0043-06GrowthandCharacterizationofLiInSe2CrystalforNeutronDetectionZHANGZheren1,ZHUMenghua1,2,XUYadong1,2(1.StateKeyLaboratoryofSolidificationProcessing,NorthwesternPolytechnicalUniversity,Xi'an710072,China;2.SchoolofMaterialsScienceandEngineering,NorthwesternPolytechnicalUniversity,Xi'an710072,China)Abstract:LiInSe2crystalsareanewtypeofsemiconductorneutrondetectionmaterialthatcandetectthermalneutronsatroomtemperature.Inthispaper,wesynthesizedalargenumberofhighpurityLiInSe2polycrystalsbyalowtemperaturesynthesismethod,andobtainedhighqualityredLiInSe2crystalsbyimprovingthegrowthprocess.Thegrowthqualityofthecrystalwascharacterizedbystudyingthetransmittanceandinclusionequalityofthecrystal,andthepossibilityofneutrondetectionwasalsostudiedbytestingtheresponseofthecrystaltoαparticles.Theresultsshowthattheinfraredtransmittanceofthecrystalis75%,thewidthofthebandgapis2.3eV,thedensityoftheinclusionphaseis2900/cm2,andthesizeoftheinclusionphaseisapproximately1~10μm.Themeasuredresistivityisapproximately5×1011Ácm,andtheenergyresolutionforαparticlesis55%.Keywords:thermalneutrondetector;LiInSe2;crystalgrowth;αresponse收稿日期:2022-09-05基金项目:核电安全监控技术与装备国家重点实验室开放课题(K-A2021.418);凝固技术国家重点实验室自主研究课题(2022-TS-07);国家自然科学基金(U2032170,62104194)作者...