Abstract
Hydroxyapatite powders were prepared after heating at <TEX>$1250^{\circ}C$</TEX> by the direct reaction using oyster shells and <TEX>$H_3$</TEX><TEX>$PO_4$</TEX>. Properties of hydroxyapatite powders were investigated as XRF, XRD, DTA, FT-IR, SEM. Only hydroxyapatite was observed in XRD powders which was heated at <TEX>$1250^{\circ}C$</TEX> for 2 hours and there was no remained CaO in that sample. And the results of FT-IR of sample was confirmed hydroxyapatite. Sample was agglomerated together, but needle shape morphology was observed in powders heated at <TEX>$1250^{\circ}C$</TEX>.
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