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ID:32465763
大小:1.81 MB
页数:72页
时间:2019-02-06
《水热法制备纳米锰锌铁氧体粉体的研究》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、西南科技大学硕士研究生学位论文第1页摘要锰锌铁氧体被应用于电子元件的制作日寸,需与银内电极共烧,而银内电极熔点仅约962℃,因此锰锌铁氧磁粉需具备低温烧结的特性。另一方面,锰锌铁氧体应用在高速读/写磁头时,需具备高密度、低孔隙率(2、艺条件对锰锌铁氧体纳米粉体制备的影响,其中着重研究了时问和温度对于粉体制备的影响。采用XRD研究结晶性能、TG.DSC研究其热稳定性、SEM和TEM对纳米粒子的微观形貌进行了分析。研究表明.水热法、球磨水热法和微波水热法均可制得结晶良好的锰锌铁氧体纳米晶:随时间和制备温度的提高,晶体的发育更好,晶体结构也更稳定:在球磨水热法中.钢球的加入有效地提高了反应的活化能,促迸了材料晶化的进程;微波的引入,对于材料的晶化也起到了强化作用;Mn。z。1.。Fe204(0≤x曼1)的晶胞参数和晶粒的大小随Mn含量增加而逐步增大;比较三种不同的水热合成方法,微波水热具有较突出的优势,其反3、应时间大为缩短,只需30min就可以制得结晶良好的锰锌铁氧体纳米晶,在节能省时方面具有突出的优点,因此,微波水热法具有较好的应用前景。关键词:水热合成法球磨微波纳米锰锌铁氧体纳米晶制各西南科技大学硕士研究生学位论文第1I页AbstractWhenMnZnferr“esappliedintheelectroniccomponentmanufacture,theymustsintertogetherwithsilverelectrode.ThemeltingpointofsilVerisonlyapproximateIy962℃,sotheMnZnferritesmustha4、Velowtemperaturesinteringproperties.0ntheotherhand,whenMnZnferritesappliedinhigh—speedread/writemagnetichead,theymusthaVehighdensity,10wfactorofporosity(5、esmustbeprepaired.Inthjsstudy,conventionalhydrothermal,baIlm“linghydrothermalandmicrowavehydrothermalwereusedtop1epareMnZnferritesnanoparticies,craftofthesethreemethodswerealsodiscussedinthepaper.Inthispaper,usingferricnitrate,zincnitrate,manganesenitrateandsodiumhydroxideasrawmaterials,M6、nZnferritesnanoparticleshaVebeenpreparedbyconVentionalhydrothermal,ball—millingassistantedhydrothermalandmicfowaveassistantedhydrothermal,thekeypoinCsofthispaperisthediscussionsoftemperatureandcuringtjmetoferritessynthesis.XRDhasbeenusedtoanalysisthecryslallizationcharacteristicsofthesa瑚p7、les,thermalpropertieshavebeenmeasuredbyTG—DSC,SEMandTEMhavebeenusedtoinVestigatethemicrostructureofaspreparedsamples.ResuItsindicate,wellcrystallizedMnZnferritesnanopaTticlescanbepreparedbyconVentionalhydrothermaI,ball—millingassistantedhydrothermalandmicrowaVeassis
2、艺条件对锰锌铁氧体纳米粉体制备的影响,其中着重研究了时问和温度对于粉体制备的影响。采用XRD研究结晶性能、TG.DSC研究其热稳定性、SEM和TEM对纳米粒子的微观形貌进行了分析。研究表明.水热法、球磨水热法和微波水热法均可制得结晶良好的锰锌铁氧体纳米晶:随时间和制备温度的提高,晶体的发育更好,晶体结构也更稳定:在球磨水热法中.钢球的加入有效地提高了反应的活化能,促迸了材料晶化的进程;微波的引入,对于材料的晶化也起到了强化作用;Mn。z。1.。Fe204(0≤x曼1)的晶胞参数和晶粒的大小随Mn含量增加而逐步增大;比较三种不同的水热合成方法,微波水热具有较突出的优势,其反
3、应时间大为缩短,只需30min就可以制得结晶良好的锰锌铁氧体纳米晶,在节能省时方面具有突出的优点,因此,微波水热法具有较好的应用前景。关键词:水热合成法球磨微波纳米锰锌铁氧体纳米晶制各西南科技大学硕士研究生学位论文第1I页AbstractWhenMnZnferr“esappliedintheelectroniccomponentmanufacture,theymustsintertogetherwithsilverelectrode.ThemeltingpointofsilVerisonlyapproximateIy962℃,sotheMnZnferritesmustha
4、Velowtemperaturesinteringproperties.0ntheotherhand,whenMnZnferritesappliedinhigh—speedread/writemagnetichead,theymusthaVehighdensity,10wfactorofporosity(5、esmustbeprepaired.Inthjsstudy,conventionalhydrothermal,baIlm“linghydrothermalandmicrowavehydrothermalwereusedtop1epareMnZnferritesnanoparticies,craftofthesethreemethodswerealsodiscussedinthepaper.Inthispaper,usingferricnitrate,zincnitrate,manganesenitrateandsodiumhydroxideasrawmaterials,M6、nZnferritesnanoparticleshaVebeenpreparedbyconVentionalhydrothermal,ball—millingassistantedhydrothermalandmicfowaveassistantedhydrothermal,thekeypoinCsofthispaperisthediscussionsoftemperatureandcuringtjmetoferritessynthesis.XRDhasbeenusedtoanalysisthecryslallizationcharacteristicsofthesa瑚p7、les,thermalpropertieshavebeenmeasuredbyTG—DSC,SEMandTEMhavebeenusedtoinVestigatethemicrostructureofaspreparedsamples.ResuItsindicate,wellcrystallizedMnZnferritesnanopaTticlescanbepreparedbyconVentionalhydrothermaI,ball—millingassistantedhydrothermalandmicrowaVeassis
5、esmustbeprepaired.Inthjsstudy,conventionalhydrothermal,baIlm“linghydrothermalandmicrowavehydrothermalwereusedtop1epareMnZnferritesnanoparticies,craftofthesethreemethodswerealsodiscussedinthepaper.Inthispaper,usingferricnitrate,zincnitrate,manganesenitrateandsodiumhydroxideasrawmaterials,M
6、nZnferritesnanoparticleshaVebeenpreparedbyconVentionalhydrothermal,ball—millingassistantedhydrothermalandmicfowaveassistantedhydrothermal,thekeypoinCsofthispaperisthediscussionsoftemperatureandcuringtjmetoferritessynthesis.XRDhasbeenusedtoanalysisthecryslallizationcharacteristicsofthesa瑚p
7、les,thermalpropertieshavebeenmeasuredbyTG—DSC,SEMandTEMhavebeenusedtoinVestigatethemicrostructureofaspreparedsamples.ResuItsindicate,wellcrystallizedMnZnferritesnanopaTticlescanbepreparedbyconVentionalhydrothermaI,ball—millingassistantedhydrothermalandmicrowaVeassis
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