高分散大粒径二钼酸铵单晶的制备与表征

以四钼酸铵和氨水为原料，通过反应-蒸发-结晶的联合操作过程制备了高分散、大粒径的二钼酸铵单晶。采用X射线衍射仪、傅里叶变换红外光谱仪、透反射光学显微镜对所得样品的物相结构和形貌进行了表征。借助TG-DSC综合热分析推断了二钼酸铵的热分解历程。同时，应用Malvern激光粒度分析仪对样品的费氏粒度、粒度分布和表观密度进行了测定。结果表明：所得样品为单晶态二钼酸铵，呈非团聚态，表面光亮，棱角分明，颗粒均匀，其费氏粒度为433.316 μm，d(0.5)为470.981 μm，表观密度为1.592 g/cm³。

Preparation and characterization of non-agglomerated ammonium dimolybdate monocrystals with high dispersion and large diameter

Non-agglomerated ammonium dimolybdate (ADM) monocrystals with large diameter and high dispersion were prepared through reaction-evaporation-crystallization united process using ammonium tetramolybdate and ammonia solution as starting reactants.Structure and morphology of the prepared ADM samples were characterized by X-ray powder diffraction，Fourier transform infrared spectroscopy，and transmission-reflection optical microscope.The thermal decomposition process of ammonium dimolybdate was deduced by TG-DSC thermal analysis,and Fisher particle size,size distribution,and loose packed density were tested by Malvern dry powder laser particle sizer.It is shown that the prepared ADM samples were non-agglomerated monocrystals with well grain normal distribution and geometric shape,and the Fisher particle size,d(0.5)，and loose packed density were 433.316 μm，470.981 μm,and 1.592 g/cm³,respectively.