Abstract
Infrared spectroscopic studies show that cyanate and cyanamide ions are formed when carbonate-containing apatites are heated with nitrogenous materials such as protein or ammonia gas. The amount formed increases with temperature starting at about 300°C, then falls off, becoming zero about 900°C. Polarized infrared spectra of heated dental enamel sections show that the cyanate ion lies in the direction of the apatite c axis.
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