LaPO4: Ce, Tb, Yb phosphor—synthesis and kinetics study for thermal process of precursor by Vyazovkin, OFW, KAS, Starink, and Mastplosts ... View Full Text


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Article Info

DATE

2015-06

AUTHORS

Yao Xia, Yingheng Huang, Yu Li, Sen Liao, Qiwei Long, Jianqun Liang

ABSTRACT

Precursor, La0.85Ce0.05Tb0.05Yb0.05PO4·3.91H2O was synthesized via solid-state reaction at 60 °C. The experimental results show that the synthesized product is hexagonal La0.85Ce0.05Tb0.05Yb0.05PO4·3.91H2O, and monoclinic La0.85Ce0.05Tb0.05Yb0.05PO4 is a novel yellowish-green emitting phosphor, which can be obtained after calcining La0.85Ce0.05Tb0.05Yb0.05PO4·3.91H2O at 800 °C in air. Based on the isoconversional procedures, the values of activation energy Eα associated with the thermal decomposition of the precursor were obtained by using OFW, KAS, Starink, and Vyazovkin methods. The values of activation energy Eα indicate that the decomposition is single-step kinetic process. The most probable reaction mechanism was estimated by Mastplosts and nonlinear methods. Mechanism equations obtained from the two methods are the same, which the nonlinear method is more efficient than the Mastplosts method. The value of pre-exponential factor A was obtained based on of Eα and the reaction mechanism. More... »

PAGES

1635-1643

References to SciGraph publications

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    http://scigraph.springernature.com/pub.10.1007/s10973-015-4548-6

    DOI

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