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[22a-C301-8] Analysis of crystallinity of hydroxyapatite layer by Raman spectroscopy coated by eclipse-type Pulsed-Laser Deposition method
Keywords:Pulsed Laser Deposition, Hydroxyapatite, Raman spectroscopy
The eclipse type pulsed-laser deposition (PLD) scheme as a droplet-eliminated method with irradiation on a β-tricalcium phosphate (b-TCP) slab target was employed to achieve high purity, and high crystallinity hydroxyapatite (HAp) coating with a low annealing temperature under a water vapor pressure. The phase of the coating layers was significantly changed from amorphous calcium phosphate to crystalline HAp when the temperature was set to over 360 deg, as determined from Raman microscopy measurements. Raman spectroscopy also showed that the HAp crystal size become larger as the temperature was increased to over 360 deg. It was concluded that the eclipse type PLD method with irradiation on a b-TCP target would improve the quality of HAp coatings and allow effective lowering of the annealing temperature. Moreover, Raman spectroscopy is a very useful tool to analyze a crystal grain size of coating layer.