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Influence of the chemical composition on the phase constitution and the elastic properties of RF sputtered hydrozyapatite coatings
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
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2008 (English)In: Plasma Processes and Polymers, ISSN 1612-8850, Vol. 5, no 2, 168-174 p.Article in journal (Refereed) Published
Abstract [en]

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.
Keyword [en]
biomaterials, coatings, elastic properties, hydroxyapatite, magnetron sputtering, phase constitution
National Category
Subatomic Physics Engineering and Technology
Research subject
Ion Physics
URN: urn:nbn:se:uu:diva-111100DOI: 10.1002/ppap.200700112ISI: 000253271000005OAI: oai:DiVA.org:uu-111100DiVA: diva2:279394
Available from: 2009-12-03 Created: 2009-12-03 Last updated: 2016-04-13Bibliographically approved

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