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SEM images showing the effect of silicon substitution on the grain size by comparing (a) HA, (b) HA-0.4Si, (c) HA-0.8Si and (d) HA1.6Si surfaces sintered at 1200°C. Silicon-substituted HA exhibits smaller grain sizes than HA, with the smallest grain size obtained for samples with the highest silicon content of 1.6 wt%. Obtained from Ref. [143]. Copyright ©2002, the American Ceramic Society.
