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Figure 2. Representative x-ray diffraction patterns of as-sputtered calcium phosphate (CaP) coatings, hydroxyapatite (HA) target, and sputtered CaP coatings after a 400°C heat treatment at different heating times in (A) the absence of water vapor and (B) the presence of water vapor. The different surfaces on both (A) and (B) were (1) no heat treatment (as-sputtered), (2) heat treatment for 1 hr, (3) heat treatment for 2 hrs, (4) heat treatment for 4 hrs, and (5) HA target.
