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In the preparation of materials, diffusion and reaction are two general but important parameters influencing the structure of materials.In a diffusion-limited condition, a non-compact structure is easily formed while a compact structure is usually formed in a reaction-limited condition.When the diffusion and reaction play a joint role,their compromise would dominate the structure of materials.In this talk, we first take the precipitation of calcium carbonate as an example to discover the role of diffusion and reaction in shaping the structure of materials.