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(a) Average crystallite size of the HA and β-TCP phases. (b,c) Evolution of the a- and c-axis lattice constants of the (b) HA and (c) β-TCP phases. Notes: The solid horizontal lines in (b) and (c) indicate the a- and c-axis lattice parameters values stipulated in the ICDD-PDF4 reference diffraction files of HA and β-TCP. The error bars of Rietveld-refined structural parameters were not represented, since their values were too small to be visualized well.
