Research on Morphology and Growth Mechanism of Xonotlite Crystal

摘要

The xonotlite crystals were synthesized via the hydrothermal synthesis manner from CaO and SiO2 as the raw materials with their Si/Ca molar ratio of 1.0. The morphologies and their growth mechanisms of xonotlite crystal were explored by taking the various siliceous sources into account in this paper. These products were characterized by XRD and SEM techniques to investigate their crystalline phase and morphology. The results indicated that siliceous material had little influence on the crystalline phases of xonotlite crystals but posed a great impact on their morphologies. Based on the various morphologies characteristics of the products, the growth mechanism for the morphologies of spherical particles and fibers were further revealed according with the in situ transformation mechanism and dissolution-precipitation mechanism respectively.