Abstract
Magnesium substituted hydroxyapatite (Mg-HA) thin films were coated on a titanium substrate using a rfmagnetron
sputtering method in Ar gas. HA/MgO mixture powder was used as the target. The molar ratio of
Mg to Ca in the mixture target was varied in the ratio of 0:10, 2:8, 4:6, 6:4 and 8:2. The sputtered Mg-HA films
were subjected to a hydrothermal treatment. The crystallinity of the Mg-HA films were observed by X-ray
diffractometer (XRD). The solubility of the Mg-HA films were measured by an ICP analysis after immersion
test in deionized water and phosphate buffered saline (PBS).
The XRD patterns revealed that the hydrothermally crystallized HA (Mg:Ca=0:10) film and Mg-HA
(Mg:Ca=2:8, 4:6) films were mainly an HA diffraction pattern, on the other hand, the Mg-HA (Mg:Ca=8:2) film
was MgO.
From the immersion test, the solubility of the HA and Mg-HA films decreased after the hydrothermal
treatment. The HA and Mg-HA (Mg:Ca=2:8) films were more soluble in deionized water than PBS. However,
the Mg-HA (Mg:Ca=4:6, 6:4, 8:2) films were soluble in PBS than deionized water.
