毕业论文--EDTA和KCl双掺杂下KDP溶液稳定性及晶体生长的实验研究

EDTA和KCl双掺杂下KDP溶液稳定性及晶体生长的实验研究摘要KDP磷酸二氢钾KH2PO4晶体是一种性能优良的电光非线性光学晶体具有较大的电光非线性系数较高的激光损伤阈值S≥115时成核方式为均匀成核S115时非均匀成核占主导地位另外通过表面熵因子的计算发现在本实验条件下KDP晶体的微观生长机制为连续生长模式③进行了不同掺杂情况下KDP晶体的生长实验并测定了KDP晶体100面的生长速度分析了晶体100面的生长速度与不同过饱和度不同掺杂浓度的关系最后结合晶体生长动力学分析了晶体100面的生长机制研究发现掺杂能适当提高KDP晶体100面的生长速度同时确定了KDP晶体100面的生长机制为二维成核生长机制通过结晶动力学分析可知掺杂在一定程度下能提高100面的生长速度这与实验结果符合④利用化学腐蚀法对不同掺杂条件下生长出来的KDP晶体100进行了腐蚀得到位错蚀坑并用光学显微镜观察了晶体表面的位错蚀坑的分布情况分析了位错与溶液稳定性的关系结果分析表明位错密度随过饱和度增加而增大而且当过饱和度为4掺杂浓度为001molEDTA和1molKCl时不仅KDP过饱和溶液的稳定性比较高而且位错蚀坑的分布比较均匀密度小适合高质量的KDP晶体生长关键词KDP晶体双掺杂稳定性成核位错密度ABSTRACTThepotassiumdihydrogenthophosphateKH2PO4KDPcrystalisoneofthenon-linearopticalmaterialsandelectroopticsitischaracterizedbyitsbignon-linearopticalcoefficientelectroopticsandhighdamagethresholdalsoithasmultipliereffectoflaserelectro-opticeffectpiezoelectriceffectandmanyotherspecialfeaturesIthasbeenbroadlyusedfortheprojectofInertialConfinementFufionICFandraycelerityswitchThereforarelativelysystematicresearchonthegrowingmechanismproprietyandperformanceoftheKDPcrystalhasobtainedDuringthegrowingprocessofKDPcrystalitfindsthatthesolutionstabilityisaimportantfactoraffectedthequalityofcrystalThereforresearchsonthesolutionstabilitygetmoreandmoreinrecentyearsdifferentfactorsaffectedthesolutionstabilityareresearchedsuchaspHvaluedopedsupersaturationoverheattimeandsoonIntheseresearchsresearchaboutdopedreportesmoreanditincludestwoaspectsOneisthesolutionstabilityanotheristheopticalqualityofcrystalInfactthereisadirectralationshipbetweenthesolutionstabilityandthequalityofcrystalbuttheyresearchisolatelyitTherefortheexperimentsofthesolutionstabilityofKDPcrystalgrowthandtheopticalqualityofcrystalarecrriedoutinthisthesisandanalysthoroughlythereasonsofthefactorsaffectedthesolutionstabilityandthequalityofcrystalatthemontenttheralationshipbetweenthesolutionstabilityandthequalityofcrystalisanalyedsimplyThemaincontentsareasfollows①ThesolubilitycurvesandthecharacterizationofthesolutionstabilityofKDParesurveyedunderdifferentconcentrationwithEDTAandKCldoubledopedbytheexperimentsItfindsthatthesolubilityofKDPdecreasebutthewidthofmetastableandinductionperiodofKDPsolutionincreaseandthesolutionstabilityisimproved②Combiningtheexperimentalresultsof①withtheclassicalnucleationtheorythenucleationparametersarecalculatedandthenucleationofsolutionisinvestigatedthoroughlyTheresultsindicatethatthenucleationstyleisthehomogeneousnucleationwhenthesupersaturationratioofKDPsoulutionS≥115andheterogeneousplayesadominatingroleinthenucleationwhenS115AtlastbycomparingthecalculatedvalueofthesurfaceentropyfactorwiththeorythesurfacegrowthmodelofKDPcrystalintheseexperimentsisidentified③TheexperimentsofKDPcrystalgrowtharecarriedoutunderdifferentconditionofdopedandthegrowthrateofthe100faceofKDPcrystalismeasuredandtheralationshipbetweenthegrowthrateandthedifferentsupersaturationandtheconditionofdopedTheresultsshowthatthegrowthrateofthe100faceofKDPcrystalisincreasedwithdoubledopedand2Dnucleationmechanismplaysadominantroleinthegrowthofthe100faceofKDPcrystalOntheotherhandthegrowthrateofthe100faceofKDPcrystalincreasesreallybythecrystallizationkineticsitcoincideswiththeexperimentalresults④The100faceofKDPisetchedunderdifferentconditionofdopedbythemethodofetchingandvividdislocationetchingpitsareobtainedandthedistributioncharacterististicsofdislocationetchingpitswereobservedbyopticalmicroscopytheralationshipbetweenthedislocationetchingpitsandthesolutionstabilityisanalysedTheresultsshowthatthedesintyofdislocationpitson100faceofKDPcrystalincreasewiththeincreasingofsupersaturationandhighersolutionstabilitymoreevendistributionofdislocationetchingpitsandlowerdislocationdensitycanbeachievedundertheconditionofthesupersaturationvalueof4andtheconcentrationof001molEDTAand1molKClThisisaproperconditionforthegrowthofhighqualityKDPcrystalKeywordsKDPcrystaldoubledopedstabilitynucleationdislocationdensity目录中文摘要I英文摘要III符号说明VII1绪论111课题的选题及研究意义1111KDP晶体结构1112KDP晶体的应用及其研究意义212KDP晶体生长方法及成核诱导期的研究概述4121KDP晶体的生长方法4122成核诱导期的研究状况513掺杂在KDP晶体生长中的研究现状6131无机离子掺杂对KDP晶体生长的影响6132有机添加剂在KDP晶体中的掺杂7133多种添加剂在KDP晶体中的掺杂814KDP晶体位错的光学显微观察915课题的研究内容102结晶过程的热动力学原理1221初级成核13211新相形成的驱动力13212均匀成核14213非均匀成核1522二次成核1623成核速率1724小结203双掺杂情况下KDP晶体溶液稳定性分析2131双掺杂对KDP溶解度的影响21311不同双掺杂浓度下KDP的溶解度实验测定21312实验结果与分析讨论2232