Preparation of LiZn_0.9PO₄:Mn_0.1路H₂O via a simple and novel method and its non-isothermal kinetics using iso-conversional calculation procedure

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• 作者：Qian Chai ; Zhipeng Chen ; Sen Liao ; ^{liaosen@gxu.edu.cn} ; ^{liaosen327@sina.com} ; ^{liaosen327@hotmail.com} ; Yu He ; Yu Li ; Wenwei Wu ; Bin Li
• 关键词：LiZn0.9PO4 ; Mn0.1· ; H2O ; Non-isothermal kinetics ; Activation energy (E) ; Thermal decomposition ; Solid-state reaction at room temperature ; Emitting phosphor
• 刊名：Thermochimica Acta
• 出版年：2012
• 期刊代码：110_00406031
• 类别：ch
• 出版时间：10 April, 2012
• 卷：533
• 期：Complete
• 页码：74-80
• 文件大小：591 K

摘要

The LiZn_0.9PO₄:Mn_0.1路H₂O was synthesized via solid-state reaction at room temperature using LiH₂PO₄路H₂O, ZnSO₄路7H₂O, MnSO₄路H₂O and Na₂CO₃ as raw materials.

The experimental results show that the synthesized product is orthorhombic LiZn_0.9PO₄: Mn_0.1路H₂O, monoclinic LiZn_0.9PO₄:Mn_0.1 is a green-yellow emitting phosphor which can be obtained after calcining LiZn_0.9PO₄:Mn_0.1路H₂O at 600 掳C in air. Based on the iterative iso-conversional procedure, the average values of the activation energies associated with the thermal dehydration of LiZn_0.9PO₄:Mn_0.1路H₂O, was determined to be 90.28 kJ mol^鈭?. Dehydration of the crystal water molecule of LiZn_0.9PO₄:Mn_0.1路H₂O is single-step reaction mechanism. A method of multiple rate iso-temperature was used to determine the most probable mechanism g(伪) of the dehydration step. It is Mample single model (g(伪) = 鈭抣n(1 鈭?#xA0;伪)) and is controlled by random nucleation and subsequent growth mechanism. The pre-exponential factor A was obtained on the basis of E_a and g(伪). Besides, the thermodynamic parameters (螖S^{鈮?/sup>, 螖H鈮?/sup>, and 螖G鈮?/sup>)) of the dehydration reaction of LiZn_0.9PO₄:Mn_0.1路H₂O were determined.}