Kinetics of Synthesis Nanophosphor Eu0.12Y1.78Ca0.10O3-δ

doi:10.3724/SP.J.1077.2011.00726

Abstract

Abstract: The nanophosphor Eu_0.12Y_1.78Ca_0.10O_3-δ was synthesized by homogeneous precipitation method under ultrasonic condition. The structures, composition and morphology of the nanophosphor Eu_0.12Y_1.78Ca_0.10O_3-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 nanophosphor Eu_0.12Y_1.78Ca_0.10O_3-δ was investigated using differential thermal analysis and thermo gravimetric analysis (DTA-TG) at different heating rates in argon. The results show that the Eu_0.12Y_1.78Ca_0.10O_3-δ is body-centered- cubic-structured spherical nano-polycrytalline with grain size of 20nm. The precursor of nanophosphor Eu_0.12Y_1.78Ca_0.10O_3-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.

Key words: nanophosphor, kinetics, apparent activation energy

CLC Number:

O614

SI Wei, WANG Jing, WANG Xiu-Hui, GAO Hong, ZHAI Yu-Chun. Kinetics of Synthesis Nanophosphor Eu_0.12Y_1.78Ca_0.10O_3-δ[J]. Journal of Inorganic Materials, 2011, 26(7): 726-730.

References

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Kinetics of Synthesis Nanophosphor Eu_0.12Y_1.78Ca_0.10O_3-δ

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