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

Kinetics of Synthesis Nanophosphor Eu_(0.12)Y_(1.78)Ca_(0.10)O_(3-δ)

作　　者：司伟[1] 王晶[1] 王修慧[1] 高宏[1] 翟玉春[2] 

机构地区：[1]大连交通大学材料科学与工程学院,大连116028 [2]东北大学材料与冶金学院,沈阳110004

出　　处：《无机材料学报》2011年第7期726-730,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(50974026)~~

摘　　要：在超声波作用下以均匀沉淀法合成了纳米荧光粉Eu0.12Y1.78Ca0.10O3-δ,用X射线衍射仪(XRD)、能谱分析仪(EDS)、等离子体原子发射光谱(ICP-AES)、透射电镜(TEM)对其进行表征,利用不同升温速率的差热?热重分析(DTA-TG)研究了纳米荧光粉Eu0.12Y1.78Ca0.10O3-δ的合成动力学.研究表明,合成的Eu0.12Y1.78Ca0.10O3-δ为体心立方Y2O3结构,球形纳米多晶,平均粒径约20nm,其前驱体为六方相Y(OH)3,利用Doyle-Ozawa法和Kissinger法计算得到前驱体三个分解阶段的表观活化能平均值分别为102.06、488.00、302.74kJ/mol.用Kissinger法确定了反应级数和频率因子,确定了三个反应阶段的速率方程分别为dα/dt=8.86×108e-12280/T(1-α)1.36;dα/dt=4.05×1033e-58700/T(1-α)1.32;dα/dt=7.14×1019e-36410/T(1-α)1.27.The nanophosphor Eu0.12Y1.78Ca0.10O3-δ was synthesized by homogeneous precipitation method under ul-trasonic condition.The structures,composition and morphology of the nanophosphor Eu0.12Y1.78Ca0.10O3-δ were characterized by X-ray diffraction（XRD）,energy dispersive spectrometre（EDS）,inductively coupled plasma atomic emission spectrometry（ICP-AES） and transmission electron microscope（TEM）.The synthesis kinetics of nano-phosphor Eu0.12Y1.78Ca0.10O3-δ was investigated using differential thermal analysis and thermo gravimetric analysis（DTA-TG） at different heating rates in argon.The results show that the Eu0.12Y1.78Ca0.10O3-δ is body-centered-cubic-structured spherical nano-polycrytalline with grain size of 20nm.The precursor of nanophosphor Eu0.12Y1.78Ca0.10O3-δ is Y（OH）3 with hexagonal phase structure.The average apparent activation energy of the three reaction stages of precursor is calculated to be 102.06,488.00 and 302.74kJ/mol by using the Doyle-Ozawa and Kissinger methods,respectively.The reaction order and frequency factor are determined by Kissinger method.The kinetics equations of each reaction stage is deduced as dα/dt=8.86×108e-12280/T（1-α）1.36,dα/dt=4.05× 1033e-58700/T（1-α）1.32,dα/dt=7.14×1019e-36410/T（1-α）1.27.

关 键 词：纳米荧光粉 动力学 表观活化能 

分 类 号：O614[理学—无机化学]