采用化学沉淀法制备出具有不同形貌(片状、柱状和等轴状等)的纳米SrSO_4粉体.采用扫描电镜和X射线衍射仪等对粉体的结构、形貌及生长机制进行了研究.片状SrSO_4粉体厚度约100 nm,片长约200 nm;柱状粉体横向长度为80～150 nm,纵向长度为700～800 nm;等轴状粉体粒径约80 nm.衍射强度对比表明,低能面(002)与(210)晶面相对生长的快慢导致了片状和柱状SrSO_4晶体的形成;而反应物浓度的降低、EDTA的络合以及PEG的分散等环境因素的改变降低了晶体生长驱动力,导致球状SrSO_4晶体的形成.
Nanoscale SrSO_4 powders were prepared by chemical precipitation method. The morphology and growth mechanisms of nanoscale SrSO_4 crystals were investigated by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The flake-like SrSO_4 particle has a thickness of 100 nm and a length of 200 nm. The rod-like SrSO_4 particle has a diameter of 80～150nm and a length of 700～800 nm. The particle size of equiaxed shape SrSO_4 crystal is about 80 nm. A comparative study on diffraction intensity ratio of SrSO_4 crystals with different crystallographic morphologies shows that, two low-energy crystal planes of (002) and (210) exhibit different growth rates, which may directly lead to the formation of flake-like and rod-like SrSO_4 crystals. However, the driving force of SrSO_4 crystal growth was reduced by decrease of the reaction concentration, adding small amounts of Sr-EDTA chelating precursors and dispersion of PEG, which results in formation of equiaxed shape SrSO_4 crystal.
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