Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 120, Issue 3, Pages 1635-1643Publisher
SPRINGER
DOI: 10.1007/s10973-015-4548-6
Keywords
Optical materials; Chemical synthesis; Decomposition; Optical properties; Thermal analysis
Funding
- Innovation Project of Guangxi Graduate Education [YCSZ2013004]
- Research and Development Foundation of Guangxi Engineering Academy for Calcium Carbonate Industry, Co., Ltd. [201406]
- Guangxi Scientific Foundation of China [2012GXNSFAA053019, 0991108]
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Precursor, La0.85Ce0.05Tb0.05Yb0.05PO4 center dot 3.91H(2)O was synthesized via solid-state reaction at 60 A degrees C. The experimental results show that the synthesized product is hexagonal La0.85Ce0.05Tb0.05Yb0.05PO4 center dot 3.91H(2)O, 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 center dot 3.91H(2)O at 800 A degrees C in air. Based on the isoconversional procedures, the values of activation energy E (alpha) associated with the thermal decomposition of the precursor were obtained by using OFW, KAS, Starink, and Vyazovkin methods. The values of activation energy E (alpha) 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 E (alpha) and the reaction mechanism.
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