文献类型：期刊文献

英文题名：Morphology-dependent thermal decomposition kinetics of (NH4) [Fe2(PO4)2(OH)(H2O)]?H2O

作者：Li, Ji Huang, Hongsheng Zheng, Jia Zhang, Hongyan Zhong, Jincheng

第一作者：Li, Ji;李静

通信作者：Zhong, JC[1];Huang, HS[2]|[14440bc80b0776b9edca1]黄宏升;[14440439396c248ec82f7]黄宏升;

机构：[1]Guizhou Normal Univ, Sch Mat & Architectural Engn, Guiyang 550003, Peoples R China;[2]Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Peoples R China

第一机构：Guizhou Normal Univ, Sch Mat & Architectural Engn, Guiyang 550003, Peoples R China

通信机构：corresponding author), Guizhou Normal Univ, Sch Mat & Architectural Engn, Guiyang 550003, Peoples R China;corresponding author), Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Peoples R China.|贵州理工学院化学工程学院;贵州理工学院;

年份：2026

卷号：353

外文期刊名：JOURNAL OF SOLID STATE CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001598912700001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (21963006) , Guizhou Provincial Science and technology plan project (Guizhou Kehe support [2023] general 144) , key laboratory of energy chemistry in Guizhou universities (Qian Jiao Ji [2022] 035) and high level talent scientific research startup project of Guizhou Institute of Technology (XJGC20190614) .

语种：英文

外文关键词：Morphology-dependent; Thermal decomposition kinetics; Mechanism function; Activation energy

摘要：Polyhedral (sample 1), ellipsoidal (sample 2), and quasi spherical (sample 3) (NH4)[Fe-2(PO4)(2)(OH)(H2O)]H2O were prepared by hydrothermal method. Their thermal decomposition process, which proceeds in three distinct stages, was investigated using model-free methods (KAS, OFW, Starink) in conjunction with the masterplot procedure to determine the activation energy (E alpha) and reaction mechanism for each stage. The results indicate that both the decomposition mechanism and E alpha are influenced by the sample morphology and particle size. The activation energy increases in the order of stage I < stage II < stage III across all morphologies. For any given stage, the E alpha values follow the trend: sample 1 > sample 2 > sample 3. Mechanistic analysis revealed that the first and second stages for all samples are governed by the phase boundary reaction model (g(alpha) = 1-(1-alpha)(1/2)), and the nucleation and growth model, respectively. In the third stage, samples 1 and 2 follow a stochastic nucleation and subsequent growth mechanism (g(alpha) = [-ln(1-alpha)](n)) model with varying n values, while sample 3 follows a chemical reaction model (g(alpha)=(1-alpha)(-1)-1). Finally, the morphological evolution and its mechanism during thermal decomposition were studied and analyzed.