高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (4): 503.

• 论文 • 上一篇    下一篇

CoFe2-xRExO4(RE=Tb,Dy)纳米晶薄膜的化学合成及磁性

程福祥, 邝峻峰, 廖春生, 徐志刚, 严纯华   

  1. 北京大学稀土材料化学及应用国家重点实验室, 北京 100871
  • 收稿日期:1998-07-07 出版日期:1999-04-24 发布日期:1999-04-24
  • 通讯作者: 严纯华
  • 作者简介:程福祥,男,30岁,博士研究生.
  • 基金资助:

    国家自然科学基金(批准号:29701001&29525101);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

Sol-Gel Synthesis and Magnetic Properties of CoFe2-xRExO4(RE=Tb,Dy) Nanocrystalline Films

CHENG Fu-Xiang, KUANG Jun-Feng, LIAO Chun-Sheng, XU Zhi-Gang, YAN Chun-Hua   

  1. State Key Laboratory of Rare Earth Materials Chemistry and Applications, Peking Univ., Beijing, 100871
  • Received:1998-07-07 Online:1999-04-24 Published:1999-04-24

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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,掺杂Tb或Dy的样品矫顽力明显提高.

关键词: 钴尖晶石, 掺杂, 纳米晶薄膜, 溶胶凝胶

Abstract: The nanocrystalline thin films of CoFe2-xRExO4(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 Tb3+and Dy3+ions inside spinel can enhance the coercive force of CoFe2O4films.

Key words: Cobalt spinel, Doping, Nanocrystalline films, Sol-gel processing

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