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

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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.
LanguageEnglish
Pages759-765
Number of pages7
JournalJournal of the American Ceramic Society
Volume96
Issue number3
DOIs
StatusPublished - 1 Mar 2013

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Durapatite
Hydroxyapatite
ion exchange
Ion exchange
Single crystals
crystal
Crystals
chlorapatite
Nanoindentation
Apatites
Apatite
Bending strength
Temperature
Fourier transform infrared spectroscopy
Minerals
Chlorides
elastic modulus
Bone
FTIR spectroscopy
Hardness

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García-Tuñon, E., Franco, J., Eslava, S., Bhakhri, V., Saiz, E., Giuliani, F., & Guitián, F. (2013). Synthesis and optimization of the production of millimeter-sized hydroxyapatite single crystals by Cl-OH ion exchange. DOI: 10.1111/jace.12199

Synthesis and optimization of the production of millimeter-sized hydroxyapatite single crystals by Cl-OH ion exchange. / García-Tuñon, E.; Franco, J.; Eslava, S; Bhakhri, V.; Saiz, E.; Giuliani, F.; Guitián, F.

In: Journal of the American Ceramic Society, Vol. 96, No. 3, 01.03.2013, p. 759-765.

Research output: Contribution to journalArticle

García-Tuñon, E. ; Franco, J. ; Eslava, S ; Bhakhri, V. ; Saiz, E. ; Giuliani, F. ; Guitián, F./ Synthesis and optimization of the production of millimeter-sized hydroxyapatite single crystals by Cl-OH ion exchange. In: Journal of the American Ceramic Society. 2013 ; Vol. 96, No. 3. pp. 759-765
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