全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

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

DOI: 10.3724/sp.j.1077.2011.00726

Keywords: nanophosphor, kinetics, apparent activation energy

Full-Text   Cite this paper   Add to My Lib

Abstract:

The nanophosphor Eu0.12Y1.78Ca0.10O3―δ was synthesized by homogeneous precipitation method under ultrasonic 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 nanophosphor 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.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133