氧化共沉淀法制备MnZn铁氧体及其稀土掺杂效应研究

《氧化共沉淀法制备MnZn铁氧体及其稀土掺杂效应研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、南昌大学硕士学位论文氧化共沉淀法制备Mn-Zn铁氧体及其稀土掺杂效应研究姓名：姜贵文申请学位级别：硕士专业：材料物理与化学指导教师：罗广圣20081201ABSTRA(玎ABSTRACTMn．Znferriteisakeymaterialofmodemelectronindustryandinformationindustry，widelyusedinswitchingpowersupplies，transformermagneticcores，informationmemorysystems，medica

2、ldiagnose，anti—electronmagneticinterferenceandSOon．Withtherapiddevelopmentoftelecommunicationandcomputertechnology，thehigherandhigherrequirementsareputforwardfortheMn·Znferrite·InordertOimprovethepropertiesofMn-Znferrite，researchesarefocusedonthefollowingt

3、hreeaspects：(1)adjustingtheproportionofthematerialcomposition，(2)theimprovementonpreparationmethod，(3)chemistrydopant．InthispaperthepreparationofMn．ZnferriteandtheeffectofRE-dopedonMn-ZnferritebyoxideCO-precipitationmethod．werestudiedInthispaperMn．Znferrit

4、enanometerpowderwassynthesizedinsolutiononthebasisofpreparationofFe304byoxideCO-precipitationmethod．Theeffectsofconcentrationofsolution，PHvalue，heat．treatmentandsurfactantwerestudiedonthephase，microstructureandmagneticpropertiesoftheMn—Znferritesamples．The

5、resultsindicatethesinglephaseMn-ZnferritenanometerpowdercanbeprepareddirectlybyoxideCO．precipitationmethod，andtheCOncentrationandPHvalueofsolutionaretwokeyfactorsofthemethod，andthehigherconcentrationandPHvalues，thehighercrystallinityandsaturationmagnetizat

6、ion．Fe203existsintheMn．Znferritesamplesaftertheyareheat—treatedatdifferenttemperaturesinairandthecontentofFe203reduceswiththerisingofheat—treatmenttemperature，whilethesaturationmagnetizationsincrease．ButFe203does’texistintheMn—Znferritesamplesaftertheyareh

7、eat．treatedat600℃inairandthencooledinnitrogenatmosphere．ThesaturationmagnetizationofMn-ZnferritesamplescooledinnitrogenatmosphereishigherthanthatofMn-Znferritesamplescooledinair．ThesurfactantCrABaddedtosolutioncanreduceagglomerationofthenanometerparticlese

8、fficiently，thecrystallitegranularityandsaturationmagnetizationdecreasewiththeincreasingoftheratioofthesurfactantandwaterweight．SecondlyMno．5．Zno．5RExFe2．x04(RE=Y、Nd、Gd、Dy)nanometerpowderwaspreparedbyoxideCO-p