Citation: HUANG Yun-Jing, LIU Shan, YANG Wei-Jun. Large Particle Ammonium Molybdophosphate: Preparation and Crystallization Kinetics[J]. Chinese Journal of Inorganic Chemistry, ;2015, (4): 789-797. doi: 10.11862/CJIC.2015.099 shu

Large Particle Ammonium Molybdophosphate: Preparation and Crystallization Kinetics

1.
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China

Corresponding author: YANG Wei-Jun,
Received Date: 12 October 2014
Available Online: 1 January 2015
Fund Project: 中央高校基本科研业务费专项基金(No.11070210)资助项目。 (No.11070210)

Large particle ammonium molybdophosphate (AMP) was prepared by slowly dropping a nitric acid solution of potassium pyrophosphate into an ammonium molybdate solution. The nucleation rate (G) and crystal growth rate for AMP were studied. Compared with crystal growth, the nucleation has a higher reaction order. Initially, large particle AMP crystallizes in the kinetic region controlled by phase transfer reaction when the growing speed of supersaturation is higher than the removing speed. The crystal linear growth rate (L) and supersaturation degree (ΔC) of the solution increases first and decreases thereafter. In the medium dropping stage, the increase in removing speed of supersaturation is the same as the growing speed. During the late dropping stage, the nucleation rate rises rapidly when the crystal linear growth rate decreases and the nucleation rate is the only control step for the removing speed of supersaturation. Therefore, the nucleation of AMP almost completes in local solution as soon as meeting the nitric acid solution.
- crystal growth;ammonium molybdophosphate;X-ray diffraction;nucleation rate;kinetics;crystal linear growth rate
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