锶、钡硼酸盐的合成、表征及其热化学研究

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1、陕西师范大学硕士学位论文锶、钡硼酸盐的合成、表征及其热化学研究姓名：黄宏升申请学位级别：硕士专业：无机化学指导教师：刘志宏20070501Synthesis，characterizationandthermochemistryofthestrontiumandbariumboratesHuangHongshengAbstractTherearemanykindsofborateswithcomplexstructures，whichproviderichresourcesforsearchingusefulborates，suchasB-Bal}204fBSO)whi

2、chisallimportantNLOmaterialbemuseithasavarietyoffavorablepropertiesandSrB407(sBo)whichisallusefulmaterialwithsomeexcellentmechanicalandopticalproperties．Sothestudiesofstrontiumandbariumborateshaveattractedmuchattentioninrecentyears．Aspartofthecontinuingstudyofalkaline-earthmetalborates，

3、wehavesynthesized11strontiumandbariumboratesbythedifferentmethods，andthestandardmolarenthalpiesofformationofthosestrontiumandbariumborateshavebeenmeasured．．Sevenstrontiumandbariumborates,SrB20l‘4H20，SrB407‘3．5H20,SrB6010·5H20，K2Sr[B405(0H)4】2’10H20，BaB6010’4．5H20，BaB20l‘4H20，K2Ba[B405(O

4、}D4】2‘8H20havebeensynthesizedbysolutionmethodatdifferenttemperaturesanddifferentcompositions．UsingtheSr(Ol歌’8H20，H3803asmaterials，wepreparedtwohydratedSt-borates,SrB20,’2．5I-120andSrB407‘3H20bythemethodsofhydrothermalreaction。ThroughthedehydrationofSra204’4H20andBaB204‘4H20,SrB204and13-

5、Ba9204wereprepared,respectively．Alloftheproductshavebeencharacterizedbychemicalanalysis，XRD，FF-IRandsimultaneousDTA-TGandhavebeenprovedtobethepuresamples，includingfourkindsofnewboratcs：SrB204‘2．5H20，SrB407‘3H20，SrB407‘3．5H20，BaB6010·4．5H20，andsevenkindsofreportedborates：SrB204,SrB204‘4H

6、20，SrB6010·5H20，K2Sr[B40s(OH)4]z-10H20,B—Ba8204，BaB204‘4H20,andK2Ba[B405(OH)1]2’8H20．Theenthalpyofsolutionoftheseelevensynthesizedpurestrontiumandbariumbomtesinlmol·L．1HCl(aq)weredeterminedbyheatconductionmicrocalorimeter．11”standardmolarenthalpiesofformationoftheseborateswereobtainedth

7、rouIghdesigningthermochemicalcycles．ThethermodynamicpropertiesofK2Sr[B405(01"I)412‘10H20andK2Ba[B405(OH)1]2’8H20werealsocalculatedbygroupcontributionmethod．Theresearchresultsofthisthesisemiehthecontentsofboratechemistry,andprovidesyntheticmethodsandphysic-chemicaldatafortheappl