Structural and mechanical characteristics of nanohydroxyapatite doped with zinc and chloride

Uysal I., Severcan F., EVİS Z.

ADVANCES IN APPLIED CERAMICS, vol.112, no.3, pp.149-157, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 112 Issue: 3
  • Publication Date: 2013
  • Doi Number: 10.1179/1743676112y.0000000053
  • Journal Name: ADVANCES IN APPLIED CERAMICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.149-157
  • Keywords: Bioceramics, Hydroxylapatite, X-ray diffraction, Sintering, ALKALINE-PHOSPHATASE, TRICALCIUM PHOSPHATE, FRACTURE-TOUGHNESS, HYDROXYAPATITE, MAGNESIUM, BEHAVIOR, APATITE, FTIR, ZN
  • Middle East Technical University Affiliated: Yes

Abstract

In this study, hydroxylapatite (HA) doped with Zn2+ and/or Cl- ions was synthesised by precipitation method and sintered at 1100 degrees C for 1 h. Densities of the samples were measured by the Archimedes method. Zn2+ addition increased the density significantly, while Cl- increased the density insignificantly. Hydroxylapatite phase and inconsiderable amount of CaO phase were detected in some samples according to the X-ray diffraction results. Cl- added samples (2.5 mol.-%) increased the hexagonal unit cell volume of HA. Characteristic PO43- and OH- bands of HA were detected in Fourier transform infrared spectroscopy. Cl- related band was also observed at a wavenumber of 3497 cm(-1). Grain sizes of the samples decreased with Cl- addition and increased with Zn2+ addition according to the SEM images. Zn2+ and Cl- addition improved the microhardness of pure HA. Fracture toughness of the samples decreased with Cl- and Zn2+ addition. When compared with other compositions, 2Zn2.5ClHA produced the best results in terms of mechanical properties.