Crystallographic texture in pulsed laser deposited hydroxyapatite bioceramic coatings.
The orientation texture of pulsed laser deposited hydroxyapatite coatings was studied by X-ray diffraction techniques. Increasing the laser energy density of the KrF excimer laser used in the deposition process from 5 to 7 J/cm(2) increases the tendency for the c-axes of the hydroxyapatite grains to be aligned perpendicular to the substrate. This preferred orientation is most pronounced when the incidence direction of the plume is normal to the substrate. Orientation texture of the hydroxyapatite grains in the coatings is associated with the highly directional and energetic nature of the ablation plume. Anisotropic stresses, transport of hydroxyl groups and dehydroxylation effects during deposition all seem to play important roles in the texture development.
Kim
Hyunbin
H
Department of Materials Science and Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
Camata
Renato P
RP
Lee
Sukbin
S
Rohrer
Gregory S
GS
Rollett
Anthony D
AD
Vohra
Yogesh K
YK