Phase Composition of Sputtered Film from a Mixture Target of Hydroxyapatite and Strontium-apatite

• Published in: Journal of materials science & technology Vol. 29; no. 1; pp. 1 - 6
• Main Authors: Ozeki, K., Hoshino, T., Aoki, H., Masuzawa, T.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2013
• Subjects: Crystal phase; Hydroxyapatite; Sputtering; Strontium; Strontium-apatite; X-射线衍射; 宾夕法尼亚州; 混合物; 溅射薄膜; 相组成; 羟基磷灰石; 行动方案; 锶取代; Strontium; Crystal phase; Hydroxyapatite; Strontium-apatite; Sputtering
• ISSN: 1005-0302; 1941-1162
• DOI: 10.1016/j.jmst.2012.11.014

To obtain an Sr-substituted hydroxyapatite thin film, sputter-coating was performed on a cellulose filter acting as a substrate from the mixture target of hydroxyapatite （HA） and strontium-apatite （SrAp） at an Ar pressure of 0.5-5.0 Pa. The ratio of the SrAp in the mixture target was varied from 25% to 100%. After coating, the films were heated at 700 ℃ to remove the cellulose filter substrate, and the crystalline phases were identified by X-ray diffraction （XRD）. The sputter-coated film was identified as the Sr-substituted /3-tri-calcium phosphate （TCP） and the Sr-substituted/3-calcium pyrophosphate （CPP） as well as the Sr-substituted HA. The weight ratio of the Sr-substituted HA decreased with increasing Ar pressure or with an increasing ratio of SrAp to HA in the target. The average Sr/（Ca ＋ Sr） molar ratio in the film was 1.9%-3.5% slightly lower than the initial SrAp ratio of the target, and the ratio was not influenced by the Ar pressure. In the （Sr ＋ Ca）/P ratio, the ratio decreased while increasing the SrAp ratio in the target.