Influence of the chemical composition on the phase constitution and the elastic properties of RF sputtered hydrozyapatite coatings
2008 (English)In: Plasma Processes and Polymers, ISSN 1612-8850, Vol. 5, no 2, 168-174 p.Article in journal (Refereed) Published
We have studied the influence of chemical composition on the constitution and elastic properties of dense radio-frequency (RF)-sputtered hydroxyapatite (HA) coatings. The chemical composition was modified by varying the RF sputtering power density (P-D). As the P-D was increased by 240%, the Ca/P ratio measured by X-ray photoelectron spectroscopy increased from approximate to 1.51 to approximate to 1.82. X-ray diffraction indicates phase pure hexagonal HA except for the sample prepared at the highest P-D where CaO and Ca-3(PO4)(2) also form. Deviations from the stoichiometric Ca/P ratio result in reduction of the elastic modulus. For Ca/P = 1.51 +/- 0.02, the elastic modulus decreases by approximate to 15%. This maybe due to incorporation of Ca vacancies in the lattice, while for Ca/P = 1.82 +/- 0.02, the average elastic modulus decreases by approximate to 10% due to formation of additional phases.
Place, publisher, year, edition, pages
2008. Vol. 5, no 2, 168-174 p.
biomaterials, coatings, elastic properties, hydroxyapatite, magnetron sputtering, phase constitution
Subatomic Physics Engineering and Technology
Research subject Ion Physics
IdentifiersURN: urn:nbn:se:uu:diva-111100DOI: 10.1002/ppap.200700112ISI: 000253271000005OAI: oai:DiVA.org:uu-111100DiVA: diva2:279394