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1、物理化學(xué)學(xué)報(bào)(WuliHuaxueXuebao)JuneActapS.一Chim.Sin.,2010,26(6):1699—1704[Article】WWW.whxb.pku.edu.cn形貌可控納米SrFe0的制備及其磁性能李巧玲常傳波景紅霞楊曉峰(中北大學(xué)理學(xué)院化學(xué)系,太原030051)摘要:以FeC13為原料,NaOH作為沉淀劑,通過化學(xué)沉淀法,制備出球狀的Fe(OH)。中間體,同時以FeClz為原料,采用化學(xué)沉淀法,分別使用NH3·H20、Na2CO3和NaOH作為沉淀劑制得了不同形貌的中問體,利用檸檬酸法在中間體表面包裹鍶的檸
2、檬酸絡(luò)合物,煅燒后分別制得了球形、紡錘體及棒狀的納米SrFe20利用x射線衍射(XRD)和透射電鏡(TEM)等測試手段對不同形貌的納米SrFet20。,進(jìn)行表征,并利用振動樣品磁強(qiáng)計(jì)(VSM)對磁性能進(jìn)行研究.結(jié)果表明:在用化學(xué)沉淀一檸檬酸法制備SrFenO的過程中,鐵鹽的種類以及沉淀劑的堿性對中問體的物相和SrFe。O的形貌有著至關(guān)重要的影響.當(dāng)原料為Fe。+時,制得了球形的納米SrFezO;當(dāng)原料為Fe時,利用堿性不同的沉淀劑可制得不同形貌的納米SrFe~O。隨著沉淀劑堿性的增加,所得SrFet20的長徑比增加,形貌各向異性增加.S
3、rFe20的矯頑力㈣主要取決于粒子的各向異性,各向異性越大,矯頑力越大,飽和磁化強(qiáng)度(Ms)隨著樣品的各向異性的增加也有所增加,以FeCI~為原料,NaOH作為沉淀劑時制得的棒狀SrFe=O。的矯頑力和飽和磁化強(qiáng)度最大分別為458.2kA·m-i和64.2A·rn2·k.關(guān)鍵詞:形貌可控;納米SrFe20;化學(xué)沉淀一檸檬酸法;磁性能中圖分類號:0648;TB383SynthesisandMagneticPropertyofShape-ControlledNano-SrFe12019UQiao—LingCHANGChuan—BoJINGH
4、ong-XiaYANGXiao—Feng(DepartmentofChemistry,SchoolofScience,NorthUniversityofChina,Taiyuan030051,P.R.China)Abstract:FeCl3andNaoHwereusedasrawmaterialandprecipitatorrespectivelytOprepareasphericalFe(OHhintermediatebychemicalprecipitation.FeC12andotherprecipitators(Naa0,NI-
5、I3’H2()andNaoH)werealsousedtoprepareshape—controHedintermediatesv/aCO—precipitation.TheintermediateswerethencoveredwithacitricacidandSrcomplexbythecitrateacidmethod.Sphefcal,spindlyandrod-likenano-SrFe,20l9particleswereobminedaftercalcinationofthecoveredprecursors.Thesha
6、pe—con~oUednano—SrFel2O19particleswei-echaracterizedbyX-raydiffraction(XRD),transmissionelectronmicroscopy(TEM)andthemagneticpropertiesofthesampleswerestudiedusingavibratingsamplemagnetometer(VSM).Resultsshowedthatthetypeofferricsaltandthealkalinityoftheprecipitatorgreat
7、lyinfluencedthephaseoftheintermediateandthemorphologyoftheSrFel2O19particles.Sphericalnano—SfFe12O】9particleswereobtainedwhenFenwasusedasarawmaterial,andshape—con~olednano—SrFenOlqparticleswereobtainedwhenFe“Wasusedasarawmaterialtogetherwithprecipitatorsofdiferentalkalin
8、ity.Theslendernessratioandshape.a(chǎn)nisotropyofthesamplesincreaseasthealkalinityoftheprecipitatorincreases