Structure of magnetron hydroxyapatite films with small stoichiometry deviation

• Published in: Functional Materials
• Date: 2016
• Main Authors: Mikhailov, I.F., Starikov, V.V., Baturin, A.A.
• Format: Article
• Language: English
• Published: НТК «Інститут монокристалів» НАН України 2016
• Subjects: Characterization and properties
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/121404
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Structure of magnetron hydroxyapatite films with small stoichiometry deviation / I.F. Mikhailov, V.V. Starikov, A.A. Baturin // Functional Materials. — 2016. — Т. 23, № 3. — С. 394-397. — Бібліогр.: 8 назв. — англ.

Phase composition, coherence lengths and micro-strain level in hydroxyapatite films with controlled deviation from stoichiometry (Ca/P = 1.67) were measured by methods of X-ray diffraction and X-ray fluorescent analysis. It was established that at Ca/P = 1.6±0.03, hydroxyapatite layers with thickness 2m on the niobium substrates were practically single-phase but differed by the coherence lengths and micro-strain levels for different crystallographic directions: the coherence length along [001] was commensurable with the film thickness and much exceeded the values for [101] and [111] directions. The micro-strain level ε for [001] direction reached (1.3÷1.7)·10⁻³ being by an order higher than for [101] and [111] directions. That testifies constrained growth conditions along [001] with the high homogeneity of the lattice period of the hydroxyapatite film.