Abstract
Chlorapatite nanopowders (n-CAp) were produced by a novel facile mechanochemical process. Results showed that the formation of n-CAp proceeded in several steps. At the beginning of milling, the main products were stoichiometrically deficient chlorapatite and calcium oxide. Eventually, high crystalline CAp nanopowder was obtained after 300min of milling. By increasing the milling time to 300min, the lattice strain increased significantly to around 0.0108±0.0005, while the crystalline size declined sharply to about 28±2nm. Similarly, the crystallinity degree of the samples was influenced by the milling time and reached about 77±4% after 300min of milling. SEM observations indicated that the milled sample had cluster-like structure which was consisted of fine particles with a mean size of about 95nm.
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