| 纳米晶Y2O3∶Eu3+的合成及其热分析动力学 |
| Synthesis of Nanocrystals Y2O3∶Eu3+ and Thermal Analysis Kinetics of the Precursor |
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| 摘要: 以Y(NO3)3、Eu2O3、CO(NH2)2为原料，使用超声波作用下的均匀沉淀法合成了纳米晶荧光粉Y2O3∶Eu3+。利用不同升温速率的热重及差热分析研究了纳米晶Y2O3∶Eu3+的合成动力学及晶粒生长动力学。研究表明，纳米晶Y2O3∶Eu3+的前驱体分解过程可分为3个步骤，利用Doyle-Ozawa法和Kissinger法分别计算了各个反应阶段的表观活化能，用Kissinger法确定每个反应阶段的反应级数和频率因子，并给出了各个阶段的动力学方程。根据晶粒生长动力学理论计算纳米荧光粉Y2O3∶Eu3+晶粒生长活化能为17.80 kJ·mol-1，表明热处理过程中纳米晶粒的长大为扩散生长机制。 |
| 关键词: Y2O3∶Eu3+ 均匀沉淀法 纳米粉体 动力学 |
| 基金项目: |
| Abstract: The nanocrystal phosphor Y2O3∶Eu3+ was synthesized using Y(NO3)3, Eu2O3 and urea as raw materials, ultrasonic and homogeneous precipitation method. The synthesis and growth kinetics of the Y2O3∶Eu3+ was investigated using TG-DTA at different heating rates in argon gas. The results show that the precursor of Y2O3∶Eu3+ decomposes in three well-defined steps. The apparent activation energy of each stage was calculated using the Doyle-Ozawa and Kissinger methods, the coefficients of reaction order, frequency factor and kinetic equations were also determined. The activation energy for the nanocrystallite growth is calculated to be 17.80 kJ·mol-1 according to kinetics theory of nanocrystallite growth. It can be inferred that the crystallite grows primarily by means of an interfacial reaction during the thermal treatment. |
| Keywords: Y2O3∶Eu3+ homogeneous precipitation method nanopowder kinetics |
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| 摘要点击次数: 1437 |
| 全文下载次数: 2003 |
| 司 伟,高 宏,王 晶,姜 妲,翟玉春.纳米晶Y2O3∶Eu3+的合成及其热分析动力学[J].无机化学学报,2010,26(8):1443-1449. |
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