化学学报 ›› 2000, Vol. 58 ›› Issue (1): 71-74. 上一篇    下一篇

研究论文

纳米晶稀土复合氧化物Dy~1~-~xSr~xCoO~3~-~y 3: 固相反应 动力学的研究

魏坤;李番;陈达   

  1. 南昌大学稀土工程中心
  • 发布日期:2000-01-15

Nanocrystalline rare earth mixed oxides Dy~1~-~xSr~xCoO~3~-~y 3: Study on the solid state reaction kinetics

Wei Kun;Li Fan;Chen Da   

  • Published:2000-01-15

依据固相反应动力学模型,研究了纳米晶Dy~1~-~xSr~xCoO~3~-~y的固相反应过程。结果表明,纳米晶稀土复合氧化物Dy~1~-~xSr~xCoO~3~-~y的固相反应是扩散控制过程,反应活化能为120kJ.mol^-^1,从823-973K温度,其反应速率常数在0.302×10^-^6~4.50×10^-^6之间。通过固相反应在700℃获得了粒径在5-15nm的纳米晶粉体,这源于纳米晶的表面和界面效应。

关键词: 复氧化物, 氧化钴, 氧化锶, 氧化镝, 反应动力学, 纳米相材料

The solid state reaction process of nanocrystalline oxides Dy~1~- ~xSr~xCoO~3~-~y (x=0.6) was studied using the model of the solid state reaction kinetics. The results show that the solid state reaction was diffusion-controlled. The activation energy of solid state reaction was 120kJ.mol^-^1. The reaction rate constant was 0.302×10^-^6~4.50 ×10^-^6 at the temperature ranging from 823K to 973K. The particle size of nano-crystalline was 5-15nm. The nanocrystalline oxides Dy~0~. ~4Sr~0~.~6CoO~3~-~y were obtained at 700℃ due to surface and interface effect of nanocrystalline.

Key words: DOUBLE OXIDE, COBALT OXIDE, STRONTIUM OXIDE, DYSPROSIUM OXIDE, REACTION KINETICS, NANOPHASE MATERIALS

中图分类号: