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在碱性条件下采用原位微量热法对CaMoO4微晶的构建进行了研究.首次呈现了CaMoO4微晶生长过程能量变化的特征热谱曲线;该特征热谱曲线由一个反映最初反应成核的典型吸热曲线和随后晶体生长的两个相对较弱的不连续放热曲线组成.在导向机制的基础上,结合CaMoO4微晶生长过程的形貌演变,简要地讨论了CaMoO4微晶生长过程的热动力学信息.反应成核过程、晶化过程及微晶的二次生长过程的速率常数分别为1.54×10-4、1.09×10-4和0.71×10-4s-1.由于晶体的聚集和扩散二者之间强烈的相互作用,使得反应速率下降,从而呈现出一个相对较平坦的第二次放热曲线.
The formation of CaMoO4 microcrystal was investigated by using in situ calorimetry under basic conditions.The first time the characteristic thermogram of CaMoO4 microcrystal growth was presented.The curve of the characteristic thermogram was composed of a nucleus that reflects the nucleation of the initial reaction The typical endothermic curve and the two relatively weaker discontinuous exothermic curves of the subsequent crystal growth.On the basis of the orientation mechanism and the morphological evolution of CaMoO4 microcrystals, the growth process of CaMoO4 microcrystals Thermal kinetic information The rate constants for the reaction nucleation process, the crystallization process and the secondary growth of the crystallites are 1.54 × 10 -4, 1.09 × 10 -4 and 0.71 × 10 -4 s -1, respectively. Due to the aggregation of crystals And diffusion between the two strong interaction, making the reaction rate decreased, showing a relatively flat second exothermic curve.