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Pulsed laser deposition of pure fluoroapatite film without OH groups
Author(s) -
Fujita Naoki,
Makino Takayuki,
Sakoishi Yasuhiro,
Asano Katsuya,
Kusunoki Masanobu
Publication year - 2016
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201500203
Subject(s) - fluorapatite , analytical chemistry (journal) , stoichiometry , fourier transform infrared spectroscopy , deposition (geology) , pulsed laser deposition , diffraction , infrared spectroscopy , materials science , infrared , chemistry , perpendicular , apatite , mineralogy , crystallography , thin film , optics , geology , chromatography , nanotechnology , geometry , paleontology , physics , organic chemistry , sediment , mathematics
The relation between O 2 pressure and composition in the pulsed‐laser deposition of fluoroapatite was investigated using both on‐axis and off‐axis methods to determine the optimal conditions for obtaining a pure fluoroapatite film without OH groups. Through this, it was found that an O 2 pressure of 10 Pa, combined with an off‐axis method, results in P/Ca and F/Ca values (0.6 and 0.2, respectively) that match closely with a stoichiometric composition of Ca 10 (PO 4 ) 6 F 2 . Fourier transform infrared spectroscopy analysis confirmed that this optimized film was almost pure fluoroapatite, with no evidence of any OH groups originating from hydroxyapatite. X‐ray diffraction also revealed that this fluoroapatite film crystallizes with a c‐axis orientation perpendicular to its surface.