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Comparison of Electrical Properties between Fluoroapatite and Hydroxyapatite Materials

✍ Scribed by A. Laghzizil; N. El Herch; A. Bouhaouss; G. Lorente; J. Macquete

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 117 KB
Volume: 156
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2000.8958

No coin nor oath required. For personal study only.

✦ Synopsis

By appropriate modi5cations of existing precipitation methods, apatite samples of formula M 10 (PO 4 ) 6 X 2 (M ‫؍‬ Ca, Pb, Ba and X ‫؍‬ F, OH) were prepared at 803C. Samples were characterized using X-ray di4raction, infrared, 31 P NMR, SEM, and chemical analysis. By comparing the e4ect of 6uoride and hydroxide ions on ionic conductivity measurements, it was concluded that the 6uorinated materials (M FAp) were better conductors than other hydroxyapatites (M HAp). The F ؊ and H ؉ ions are the main charge carriers, respectively, in 6uoroapatite and in hydroxyapatite compounds. The most pronounced e4ect on the conduction properties was observed in the lead apatite material. These results should provide important physico-chemical information for ionic di4usion of the roles played by 6uoride in inhibiting dental caries.

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