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Effect of heat treatment on pulsed laser deposited amorphous calcium phosphate coatings

Research output: Contribution to journalJournal article

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  • F. García
  • J.L. Arias
  • B. Mayor
  • J. Pou
  • I. Rehman
  • J. Knowles
  • S. Best
  • B. León
  • M. Pérez-Amor
  • W. Bonfield
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<mark>Journal publication date</mark>1998
<mark>Journal</mark>Journal of Biomedical Materials Research Part A
Issue number1
Volume43
Number of pages8
Pages (from-to)69-76
Publication statusPublished
Original languageEnglish

Abstract

Amorphous calcium phosphate coatings were produced by pulsed laser deposition from targets of nonstoichiometric hydroxyapatite (Ca/P = 1.70) at a low substrate temperature of 300 °C. They were heated in air at different temperatures: 300, 450, 525 and 650 °C. Chemical and structural analyses of these coatings were performed using X-ray diffraction (XRD), FTIR, and SEM. XRD analysis of the as-deposited and heated coatings revealed that their crystallinity improved as heat treatment temperature increased. The main phase was apatitic, with some β-tricalcium phosphate in the coatings heated at 525 and 600 °C. In the apatitic phase there was some carbonate substitution for phosphate and hydroxyl ions at 450 °C and almost solely for phosphate at 525 and 600 °C as identified by FTIR. This was accompanied by a higher hydroxyl content at 525 and 600 °C. At 450 °C a texture on the coating surface was observable by SEM that was attributable to a calcium hydroxide and calcite formation by XRD. These phases almost disappeared at 600 °C, probably due to a transformation into calcium oxide. Amorphous calcium phosphate coatings were produced by pulsed laser deposition from targets of nonstoichiometric hydroxyapatite (Ca/P = 1.70) at a low substrate temperature of 300°C. They were heated in air at different temperatures: 300, 450, 525 and 650°C. Chemical and structural analyses of these coatings were performed using X-ray diffraction (XRD), FTIR, and SEM. XRD analysis of the as-deposited and heated coatings revealed that their crystallinity improved as heat treatment temperature increased. The main phase was apatitic, with some β-tricalcium phosphate in the coatings heated at 525 and 600°C. In the apatitic phase there was some carbonate substitution for phosphate and hydroxyl ions at 450°C and almost solely for phosphate at 525 and 600°C as identified by FTIR. This was accompanied by a higher hydroxyl content at 525 and 600°C. At 450°C a texture on the coating surface was observable by SEM that was attributable to a calcium hydroxide and calcite formation by XRD. These phases almost disappeared at 600°C, probably due to a transformation into calcium oxide.