The composites of CaCO_3 and calcium stearate were synthesized by co-precipitation method in sodium stearate solution. Through the SEM and XRD methods, it is found that the composites obtained at defferent temperature and concentration of organics have distinctive shapes, in which CaCO_3 is mixed with two crystallization types of calcite and vaterite in the ratio of a well-regulated value. It is presumed that the organics in the solution assembled together to form micelles, with well arranged hydrophilic groups on surface, which affect the crystallization of calcium carbonate by different matching forms. The shape and movement way of the micelles vary at different temperature and concentration of organics and cause the multi-formed composites with mixture crystals in different ratios.

Key words: CALCIUM CARBONATE, CALCITE, STEARIC ACID P, SEM, XRD, CRYSTALLIZE