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ID:32469444
大小:2.27 MB
页数:58页
时间:2019-02-06
《室温固相法制备钴掺杂纳米γcoltxgtfelt2xgtolt3gt及表征研究》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、室温周相法制备钻掺杂纳米?-CoxFe2.x03及表征研究中文摘要摘要本文以FeS04-7H20(A.R.)、COS04·7H20(A.R.)和H2C204·2H20(A.&)作为原料,采用室温固相法制备获得了纳米?-CoxFe2-x03(x=0~0.3)的前驱体(CoxFe2.。)l/2C204-2H20。XRD、ICP和FTIR等技术分析结果表明,室温固相法可以合成原子级掺杂的(CoxFe,.01aC204·2H20前驱体,通过适当温度煅烧最终获得了具有良好磁性能,热稳定性高,晶粒尺寸为20rim.30rim和分布较为均匀的单相纳米?-
2、Co善Fe2.x03。采用XRD等技术首次定量评估了钴掺杂量与纳米?-CoxFe2哇03晶粒长大激活能的关系;对钴掺杂量与前驱体煅烧过程中形成的相组成、纳米?-CoxFe2.x03晶格畸变大小和热稳定性等关系也作了细致地分析和讨论。结果表明,当钴掺杂量(x)大于O.1时,纳米?-CoxFe2-x03晶粒长大激活能(历)从18.97kJ/mol迅速降至9.30kJ/tool;钴掺杂量的增加有利于纳米?-CoxFc2吖03相热稳定性的提高,当钴掺杂量(工)为0.214时,在500"12,3h条件下煅烧可以获得单一的纳米y-Coo.214Fel.
3、78603相。X射线衍射谱的精细分析和FTlR分析研究表明,随着钴掺杂量增加,钴掺杂导致T(CoxFe2-x)1,2c204·2H20晶格收缩畸变和红外吸收带蓝移;纳米丫.C啦e2哇03晶格收缩畸变。磁强振动计(VSM)分析研究表明,随着钻含量的增加,纳米^r-CoxFe2.x03的饱和磁化强度、剩余磁化强度和矫顽力均出现先增后减再增的变化规律。在450*(2,3h条件下煅烧获得的纳米?-Coo.1犯Fel.sis03具有最高的饱和磁化强度(39.7emu/g)、剩余磁化强度(23.1emu/g)和矫顽力(1790.30e)。关键词:纳米?
4、-Coffe2.x03;室温固相反应;钴掺杂;晶格畸变;热稳定性:长大激活能作者:陈卓耿指导老师:李亚东室温固相法制备钴掺杂纳米?-Coffe2.。03及表征研究英文摘要ResearchonPreparation,CharacterizationofCobalt-dopednano一7一CoxFe2.x03throughAmbientTemperatureSolid—-stateReactionsAbstractInthispaper,theprecursorsofnano-,'l,-CoxFe2.x03(x=0—0.3)powdersar
5、esynthesizedwithFeS04·7H20㈣,COS04·7H20(AR)andI-12C204·2H20(Art)throughsolidstatereactionatambienttemperature.XRD,ICPandFTIRanalysisresultsshowthattheatomic—scalecobaltdoped(CoxFe2《)!/2C204‘2H20precursorscallbeobtainedbythetechnologyofsolid—statereactionatambienttemperature
6、.Throughappropriatecalcinationtemperature,single-phasenano-^/-CoxFe2.x03whichhavegoodmagneticpropertiesandhighthermalstabilityareobtained.Thegrainsizesofthesenano-q—CoxFe2.x03aleabout20nm-30nmandhavemoreuniformsizes.Technologiessuchastheuse’ofXRDquantitativelyevaluateofthe
7、contentofcobalt-doped谢tllnano吖-CoxFe2-x03graingrowthactivationenergyrelationship.Relationshipsbetweenthecontentofcobalt-dopedandphasecompositionofprecursorswhencalcinatedandnano吖-CoxFe2.x03latticedistortionandthermalstabilityalealsodiscussed.Researchshowsthatwhenthecontent
8、ofcobalt-doped(x)isgreaterthanO.1,thermno-ff-CoxFe2-x03graingrowthactivationenergy(鼢desce
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