Abstract: In the present work, many complexes of transition metal chloride and ammonia were prepared by homogeneous precipitation method, in which metal chloride was used as raw material, urea as precipitant and alcohol as solvent. The effects of urea concentration, reaction time and temperature on the size and morphology of the products were investigated by taking cadmium chloride as a typical research object. The compositions, thermal stability, morphology and particle size distribution of the product were characterized through X-ray diffraction (XRD), thermogravimetric analysis-differential scanning calorimetry (TG-DSC), scanning electron microscopy (SEM) and laser particle size analyzer (LPSA). The product identified to be diammine cadmium chloride Cd(NH3)2Cl2. With the increase of the urea concentration, the size of the product particles increased correspondingly. The shorter reaction time was benificial to obtain monodisperse and polyhedral Cd(NH3)2Cl2 particles and they seriously agglomerated once the reaction time was prolonged. The morphology of the product particles changed little and barely agglomerated with the increase of the reaction temperature. Furthermore, the size uniformity of the product particles was better at higher temperature.
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2018, Vol. 32 
