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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian

IMPACT FACTOR 2018: 2.631

CiteScore 2018: 2.55

SCImago Journal Rank (SJR) 2018: 1.355
Source Normalized Impact per Paper (SNIP) 2018: 1.103

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Volume 92, Issue 10


Letter: Hydrogen-carbonate ion in synthetic high-pressure apatite

Michael E. Fleet / Xi Liu
Published Online: 2015-04-01 | DOI: https://doi.org/10.2138/am.2007.2716


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.

Keywords: Apatite; hydrogen-carbonate ion; high-pressure synthesis; FTIR spectra; CO2 mobility; H2O mobility

About the article

Received: 2007-06-13

Accepted: 2007-07-04

Published Online: 2015-04-01

Published in Print: 2007-10-01

Citation Information: American Mineralogist, Volume 92, Issue 10, Pages 1764–1767, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2007.2716.

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© 2015 by Walter de Gruyter Berlin/Boston.Get Permission

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