CoFe_(2-x)RE_xO_4(RE=Tb,Dy)纳米晶薄膜的化学合成及磁性  

Sol\|Gel Synthesis and Magnetic Properties of\= CoFe\-\{2-x\}RE\-xO\-4 (RE=Tb,Dy) Nanocrystalline Films

作　　者：程福祥[1] 邝峻峰[1] 廖春生[1] 徐志刚[1] 严纯华[1] 

机构地区：[1]北京大学稀土材料化学及应用国家重点实验室

出　　处：《高等学校化学学报》1999年第4期503-506,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金;国家重点基础研究专项基金;教育部博士点基金;北大方正基金;中国博士后基金

摘　　要：以溶胶－凝胶法制备了稀土铽或镝掺杂的钴尖晶石铁氧体纳米晶薄膜．考察了Ｔｂ或Ｄｙ的掺杂量及晶化条件对晶相的影响．结果表明，稀土离子的掺杂量ｘ超过０．３时，样品很难形成尖晶石单相．原子力显微镜对纳米晶薄膜表面形貌的观测显示，溶胶－凝胶法制备的薄膜粒度可控制在２０～５０ｎｍ，且具有较高的表面平整度．对于厚度为２００ｎｍ的薄膜，均方根粗糙度仅为４～５ｎｍ．磁特性研究发现。The nanocrystalline thin films of CoFe\-\{2-x\}RE\-xO\-4 (RE=Tb,Dy) were fabricated by sol\|gel processing. By varying the doping content of rare earth ions, x, and the annealing conditions, the difficult crystallization of spinel phase was found for the samples with \{x>\}\{0.3\}, which is ascribed to te large radii of rare earth ions. AFM observation indicated that the grain size can be controlled between 20￣50 nm and the sol\|gel derived thin films have a surface with a low roughness of 4￣5 nm. The doping of Tb\+\{3+\} and Dy\+\{3+\} ions inside spinel can enhance the coercive force of CoFe\-2O\-4 films.

关 键 词：磁光存贮材料 铁氧化 钴尖晶石 掺杂 纳米晶薄膜 

分 类 号：TM277.1[一般工业技术—材料科学与工程] TP333.41[电气工程—电工理论与新技术]