Chemical and crystallographic characterizations of hydroxyapatite-and octacalcium phosphate-coatings on magnesium synthesized by chemical solution deposition using XPS and XRD

Naofumi Ohtsu, Sachiko Hiromoto, Misao Yamane, Kozue Satoh, Masanari Tomozawa

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

Hydroxyapatite (HAp) and octacalcium phosphate (OCP) coatings deposited on a pure magnesium (Mg) substrate from an aqueous solution containing C10H12N2O8Na2Ca (Ca-EDTA) and KH2PO4 were precisely analyzed using X-ray photoelectron spectroscopy (XPS) and high-resolution X-ray diffractometry (XRD) to clarify their chemical and crystallographic characteristics. The calcium phosphate coatings comprised single-phase HAp or OCP containing small amounts of sodium (Na). The intermediate layer formed underneath the coatings consisted of Mg(OH)2 mixed with calcium phosphate. The atomic ratios of calcium to phosphorus ([Ca]/[P]) in the HAp and OCP coatings were notably smaller than those of stoichiometric compounds. The expansion along the a-axis compared to that of stoichiometric HApwas observed in XRD results. Also, we did not detect Na compounds in the coating. Therefore, it is presumed that Na existed as a substitute of Ca in the OCP and HAp structures.

Original languageEnglish
Pages (from-to)114-118
Number of pages5
JournalSurface and Coatings Technology
Volume218
Issue number1
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Calcium phosphate coatings
  • Chemical solution deposition
  • Magnesium
  • XPS
  • XRD

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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