| 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 |
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| 引用本文： | 魏坤,李番,陈达.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[J].化学学报,2000,58(1):71-74. |
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| 作者姓名： | 魏坤 李番 陈达 |
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| 作者单位： | 南昌大学稀土工程中心 南昌330047
(魏坤，李番)，南昌大学稀土工程中心 南昌330047(陈达) |
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| 摘 要： | 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。
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| 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 |
| 修稿时间： | 1999-02-10 |
Nanocrystalline rare earth mixed oxides Dy~1~-~xSr~xCoO~3~-~y 3: Study on the solid state reaction kinetics |
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| WEI Kun ,LI Fan ,CHENG Da.Nanocrystalline rare earth mixed oxides Dy~1~-~xSr~xCoO~3~-~y 3: Study on the solid state reaction kinetics[J].Acta Chimica Sinica,2000,58(1):71-74. |
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| Authors: | WEI Kun LI Fan CHENG Da |
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| Institution: | WEI Kun ,LI Fan ,CHENG Da
(Rare Earth Technical Centre, Nanchang University, Nanchang, 330047) |
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| Abstract: | 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. |
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| Keywords: | nanocrystalline solid state reaction kinetics surface and interface effect |
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