Synthesis and optimization of the production of millimeter-sized hydroxyapatite single crystals by Cl-OH ion exchange

E. García-Tuñon, J. Franco, S Eslava, V. Bhakhri, E. Saiz, F. Giuliani, F. Guitián

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Millimeter-sized hydroxyapatite (HA) single crystals were synthesized from chlorapatite (ClAp) crystals via the ionic exchange of Cl for OH at high temperature. X-ray diffraction, Fourier-transform infrared spectroscopy, and chloride content measurements were used to follow the progress of this conversion, and to assess the effect of the experimental conditions (temperature, time, and atmosphere). Cl→OH exchange took place homogeneously and was enhanced by firing in wet air. After firing at 1425°C for 2 h 92% of the Cl ions were exchanged by OH while maintaining crystal integrity. Temperatures above 1450°C damaged the surface of the crystals, destroying the hexagonal habit at 1500°C. The composition of these apatite crystals was close to bone mineral content. Their nanoindentation hardness (8.7 ± 1.0 GPa) and elastic nanoindentation modulus (120 ± 10 GPa) were similar to those of the starting ClAp (6.6 ± 1.5 GPa, and 110 ± 15 GPa, respectively). However, their average flexural strength was ~25% lower due to the formation of defects during the thermal treatments.
Original languageEnglish
Pages (from-to)759-765
Number of pages7
JournalJournal of the American Ceramic Society
Volume96
Issue number3
DOIs
Publication statusPublished - 1 Mar 2013

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