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Hydrogen-carbonate ion in synthetic high-pressure apatite

Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada

Correspondence: ^* E-mail: mfleet{at}uwo.ca

The hydrogen-carbonate ion [(HCO₃)^–] has been detected by Fourier transform infrared (FTIR) spectroscopy in the c-axis structural channel of Na-bearing type A-B carbonate apatite synthesized under conditions of high P (0.1–1 GPa), T (800–1350 °C), and p(CO₂), and accounts for up to one-third of the total complement of channel carbonate. The hydrogen-carbonate ion is only loosely bound in the apatite channel, and breaks down on aging at room temperature. Volatile decomposition products are lost from the carbonate apatite structure, with CO₂ more mobile than H₂O. The mobility of small volatile molecules points to a possible role for the apatite channel in mediating acid-base reactions in restricted surficial environments and biological systems.

Key Words: Apatite • hydrogen-carbonate ion • high-pressure synthesis • FTIR spectra • CO₂ mobility • H₂O mobility

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