The effect of fluoride ion concentration on apatite formation and on its crystal habit |
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| Authors: | Yoetz Deursch Sara Sarig |
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| Affiliation: | Casali Institute of Applied Chemistry, Hebrew University of Jerusalem, Israel;Geochemistry Department, Geological Survey of Israel, 30, Malkhei Israel St., Jerusalem, Israel |
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| Abstract: | The effect of fluoride ions on the rate of apatite [ca10(PO4)6(F,OH)2] formation and on its crystal habit was investigated. It was found that both at high and at low fluoride concentrations the rate formations is retarded. At two optimal concentrations, namely at 3.4 and 5.5 fluoride: apatite excess of the stoichiometric ratio, the rate is the highest. The crystal habit of the apatite formed at high fluoride concentrations is hexagonal plate-like, while the apatite formed at low fluoride concentrations is dendritic or needle-like. The concentrations of fluoride in the crystals were determined by specific fluoride electrode technique. |
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