Abstract
The infrared spectra of lead hydroxyapatite Pb 10(PO 4) 6(OH) 2, oxyapatite Pb 10(PO 4) 6O, and the lead alkaliapatites Pb 8M 2(PO 4) 6 (M = Na, K, Rb, T1) were investigated down to 200 cm −1. There are significant differences between all these spectra. In the hydroxy- and oxyapatite spectrum one band is ascribed to the translational motion of the OH − and O 2− ions, respectively. The thermal dependance of the dehydration of hydroxy to oxyapatite was studied by X-ray methods, both compounds forming a solid solution. The heat of decomposition of hydroxyapatite was found to be ΔH = 5 kcal/mole. Moreover, complete miscibilities could be shown to exist in the systems Pb 8Na 2(PO 4) 6 Pb 10(PO 4) 6O and Pb 8Na 2(PO 4) 6 Pb 10(PO 4) 6(OH) 2 , respectively.
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