Pb2P2Se6晶体的化学气相输运生长及光学性能姬磊磊1,2，朱梦琴1,2，李芳沛1,2，介万奇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：三元硫属化合物Pb2P2Se6晶体因具有优异的光电性能，在光电领域受到广泛关注。然而，由于P元素易燃易爆等特点导致其难以合成。本文通过高温固相法合成了纯Pb2P2Se6多晶，并基于多晶粉体以NH4Cl为传输剂通过化学气相输运生长法成功生长出单晶。所得到的Pb2P2Se6晶体呈平行四面体，暴露的晶面为(011)面，晶面间夹角为62°和118°。X射线衍射分析证明其晶体结构为单斜晶系，空间群为P21/n(No.14)，晶胞参数分别为a=6.897魡，b=7.642魡，c=9.696魡，β=91.5°。此外，晶体的红外透射率在1000~4000cm-1范围内为50%，UV-Vis-IR透过谱拟合禁带宽度为1.89eV。关键词：Pb2P2Se6；化学气相传输；透过率；光学性能中图分类号：O78文献标识码：A文章编号：1000-8365(2023)01-0038-05ChemicalVaporTransportSynthesisofPb2P2Se6CrystalsandtheirOpticalPropertiesJILeilei1,2,ZHUMengqin1,2,LIFangpei1,2,JIEWanqi1,2(1.StateKeyLaboratoryofSolidificationProcessing,NorthwesternPolytechnicalUniversity,Xi'an710072,China;2.SchoolofMaterialsScienceandEngineering,NorthwesternPolytechnicalUniversity,Xi'an710072,China)Abstract：TernarymetalphosphorustrichalcogenidePb2P2Se6crystalshaveattractedwideattentionbecauseoftheirpotentialapplicationsinoptoelectronics.However,itisdifficulttosynthesizeduetocontainingP,whichhascharacteristicsofflammabilityandexplosiveproperty.Here,wegrewpurePb2P2Se6singlecrystalsbythechemicalvaportransport(CVT)methodusingNH4Clasatransportagentfromsolidstatesynthesizedpolycrystals.Theas-growntetrahedroncrystalexposesthe(011)crystallographicplanewithanglesof62°and118°.TheexperimentalXRDpatternrevealsthatthesinglecrystalcrystallizesinamonoclinicstructurewiththeP21/nspacegroupwithlatticeparametersofa=6.897魡，b=7.642魡，c=9.696魡andβ=91.5°.Inaddition,theinfraredtransmittanceofthecrystalis50%intherangeof1000~4000cm-1,andthebandgapis1.89eV,asdeterminedbytheUV-Vis-IRtransmissionspectrum.Keywords：Pb2P2Se6;chemicalvaportransport;transmittance;opticalproperti...
