纳米Eu_(0.12)Y_(1.78)La_(0.10)O_(3-δ)荧光粉的合成动力学

The Kinetics of Synthesis of Nanophosphor Eu_(0.12)Y_(1.78)La_(0.10_O_(3-δ)

利用不同升温速率的差热-热重分析(DTA-TG)研究纳米Eu0.12Y1.78La0.10O3-δ荧光粉的合成动力学。研究表明,纳米Eu0.12Y1.78La0.10O3-δ荧光粉的前驱体为六方相Y(OH)3,利用Doyle-Ozawa法和Kissinger法计算得到前驱体2个分解阶段的表观活化能平均值分别为699.40、362.81kJ.mol-1。用Kissinger法确定反应级数和频率因子,确定纳米Eu0.12Y1.78La0.10O3-δ荧光粉2个合成阶段的反应速率方程分别为dα/dt=1.94×1046e-84120/T(1-α)1.17;dα/dt=5.89×1020e-43640/T(1-α)1.14。

The kinetics of synthesis of nanophosphor Eu0.12Y1.78La0.10O3-δ was investigated using differential thermal analysis and thermo gravimetric(DTA-TG) at different heating rates in argon gas.The results show that the precursor of nanophosphor Eu0.12Y1.78La0.10O3-δ is Y(OH)3 with hexagonal phase structure,The average apparent activation energies of the two reaction stages of the precursor were calculated using the Doyle-Ozawa and Kissinger methods they are 699.40 and 362.81 kJ.mol-1,respectively,The reaction order and frequency factor can be also determined by Kissinger method,The kinetics equations of the reaction were deduced,they are dα/dt=1.94×1046e-84120/T(1-α)1.17,dα/dt=5.89×1020e-43640/T(1-α)1.14,respectively.