摘要
用气泡液膜法于室温,将n(Ni 2+)∶n(Zn2+)∶n(Fe3+)=0.6∶0.4∶2.0的水溶液与OH-水溶液在气泡液膜中进行共沉淀反应制得的前驱体,用元素分析、EDS、FT-IR、HRTEM、VSM、DSC和XRD进行了表征。实验结果表明前驱体为0.6Ni(OH)2(H2O)0.75.(0.4-n)Zn(OH)2.(2-2m-2n)Fe(OH)3.mFe2O3.nZnFe2O4.xH2O复合物,其微结构呈现大量尺度为2～8nm的螺旋状分子簇和少许尺度约10nm的亚晶结构,在它们的周围还存在无序点状衬度。在新合成的前驱体中检测出Fe2O3和ZnFe2O4,指出分子簇演绎Fe(OH)3脱水形成Fe2O3晶核,Zn(OH)2脱水产生的ZnO分子对Fe2O3晶核自组装,生成ZnFe2O4亚晶结构。前驱体的弱磁性是Fe2O3和ZnFe2O4的磁性表现。前驱体的表观形态为2～8mm的无定形块状体。
Ni-Zn-Fe hydroxide as a precursor was prepared using the coprecipitation of aqueous solution of mole ratio n（Ni2＋）∶n（Zn2＋）∶n（Fe3＋）=0.6∶0.4∶2.0 with OH-in gas bubble liquid membrane.The precursor was characterized by means of elemental analysis,EDS,FT-IR,HRTEM,VSM,DSC and XRD.The precursor showed a five phase mixture of 0.6Ni（OH）2（H2O）0.75,（0.4-n）Zn（OH）2,（2-2m-2n）Fe（OH）3,mFe2O3 and nZnFe2O4 by XRD pattern.The microstructure of the precursor shows a large amount of spiral molecular clusters with 2-8nm size,a few of subcrystalline structures with about 10nm size and some disorder point contrasts around the molecular clusters and subcrystalline structures.The precursor can dehydrate slowly at room temperature into Fe2O3,ZnO and water.Fe2O3 and ZnFe2O4 subcrystalline structure were detected from the fresh precursor,which implied that spiral molecular clusters evolve by Fe（OH）3 preferentially dehydrates into Fe2O3 crystal nucleus,Zn（OH）2 dehydrates into ZnO,followed by nascent ZnO molecule self-assembles to Fe2O3 crystal nucleus into ZnFe2O4 subcrystalline structure,during the precursor was prepared.The magnetic property for the precursor was attributed to the presences of Fe2O3 and ZnFe2O4 ferrite both.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2013年第4期559-561,565,共4页
Journal of Functional Materials
关键词
气泡液膜
Ni-Zn-Fe氢氧化物
螺旋状分子簇
室温脱水
前驱体
gas bubble liquid membrane
Ni-Zn-Fe hydroxide
spiral molecular cluster
dehydrate at room temperature
precursor
