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FE-SEM photographs of surfaces and a cross section of Ti metals soaked in SBF for 1 day, after being heat-treated at various temperatures following the acid treatment. (a) Before heat treatment and heat-treated at (b) 400°C, (c) 500°C, (d) 550°C, (e) 600°C, (f) 650°C, (g) 700°C, (h) 800°C and (i) a cross section of Ti metal at 600°C.
