ZnO对MgO-Al2O3-SiO2体系的结构和红外辐射性能的影响.pdf

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1、第31卷第6期硅酸盐学报Vol.31No.62003年6月JOURNALOFT~EC~INESECERAMICSOCIETJune2003Zn0对Mg0Al203Si02体系的结构和红外辐射性能的影响徐庆1!2!刘晓芳2!张枫2!陈文1!2!袁润章1C1.武汉理工大学材料复合新技术国家重点实验室;2.武汉理工大学材料科学与工程学院武汉430070)摘要!采用固相反应法制备名义组成为Mg2C1J)Zn2JAl4Si5O18CJ=0!0.6)的红外辐射材料测试了样品的红外辐射性能并用XRDIR29SiMASNMR等方法研究了体系的结构研究结果表明:J＜0.2时样品主要为Zn2+固溶!堇青石结构

2、Zn2+的固溶使T1C与MgO6]八面体一起在六元环之间起连接作用的四面体)和T2C组成六元环结构的四面体)四面体上AlSi分布的有序度提高引起!堇青石晶格产生畸变增强了晶格振动的非简谐效应和样品的红外辐射性能J=0.2时样品的红外辐射性能达到最佳其法向全波段比辐射率达到0.89在8!25"m内各波段的辐射率达到0.90!0.93J＞0.2时样品的红外辐射性能随J的增大而降低Jj0.4时样品中主要形成CMg1JZnJ)Al2O4尖晶石固溶体和方石英关键词!氧化锌;!堇青石;镁铝尖晶石;固溶体;红外辐射性能中图分类号!TN219文献识别码!A文章编号!04545648C2003)060529

3、04EFFECT0FZn00NMICR0STRUCTUREANDINFRAREDRADIATI0NPR0PERTIES0FMg0Al203Si02SYSTEM12LIUXaOfang2Z~ANGfeng2C~ENWen12YUANRunzhang1XUOngC1.StateKeyLaboratoryofAdvancedTechnologyforMaterialsSynthesisandprocessing;2.SchoolofMaterialsScienceandEngineeringWuhanUniversityofTechnologyWuhan430070China)Abstract:

4、InfraredradiationmaterialswiththenominalcompositionsofMg2C1-J)Zn2JAl4Si5O18CJ=0!0.6)weresynthesizedbytheconventionalsolidstatereactionmethod.Infraredradiationpropertiesofthematerialsweremeasuredandthemicro-292+structurewereinvestigatedbyXRDIRandSiMASNMR.TheresultsindicatethatZn-substituted!cordier

5、iteareascer-2+2+tainedasthemaincrystalphaseforthesamplesofJ＜0.2.ThesubstitutionofZnforpartialMgof!cordieritepromotestheorderingofthedistributionofAlandSiatomsintheT1CtetrahedronactingasconnectionbetweenheXatomicringstogetherwithMgO6]octahedron)andT2CtetrahedronconsistingheXatomicringstructure)tetr

6、ahedralsitesandbringsthelatticede-formationfor!cordieritewhichresultsintheincreaseoftheanharmonicityofpolarizationvibrationandinfraredemissivities.TheoptimuminfraredradiationpropertiesareobtainedinthesampleofJ=0.2eXhibitingtheinfraredemissivityof0.89inthewholebandandinfraredemissivitiesof0.90_0.93

7、inthebandswithin8_25"m.Theinfraredradiationpropertiesde-2+creasewithJforthesamplesofJ＞0.2.TheZn-substitutedMgAl2O4spinelsolutionandcrystobaliteareidentifiedasthemaincrystalphasesforthesamplesofJj0.4.Keywords:zinc