利用离子掺杂固相法煅烧立方晶型硫铝酸钙

Through doping with appropriate amount of Na⁺, Si⁴⁺ and Fe³⁺ ions, which are common elements in cement raw materials, the cubic calcium sulphoaluminate(Ca₄Al₆SO₁₆, C₄A₃$) was prepared by solid state reaction. The phase composition and microstructure of Ca_4-x Na_xAl_6-x-yFe_ySi_xO₁₂SO₄ were studied by X-ray diffractometry, scanning electron microscopy and several other modern characterization techniques. The results show that Na⁺ ions has an important role on the formation and stability of cubic C₄A₃$. When the doping amount of Na⁺ ions is lower or higher(x=0.1 or x=0.4), C₄A₃$ is mainly of orthorhombic structure with many by-products formation. When the doping amount of Na⁺ ions is x=0.2 or x=0.3, and the appropriate amounts of Si⁴⁺ and Fe³⁺ ions are mixed, C₄A₃$ mainly exists in a cubic structure(up to more than 80%, mass fraction). The synthetic cubic C₄A₃$ has polygonal and spherical morphology, respectively.