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Some physical properties of Na- and CO3-containing apatites synthesized at high temperatures

Authors
Journal
Inorganica Chimica Acta
0020-1693
Publisher
Elsevier
Publication Date
Volume
80
Identifiers
DOI: 10.1016/s0020-1693(00)91256-8

Abstract

Abstract The stability of Na- and CO 3-containing apatites was investigated at 870°C in a nearly dry CO 2 atmosphere. In a P/Ca versus Na/Ca plot the single-phase apatite field has a triangular form of which one extreme composition corresponds to Ca 10(PO 4) 6(CO 3) and another to Ca 8·5Na 1·5(PO 4) 4·5(CO 3) 2·5. Chemical and physical analyses show that the stoichiometry of apatites with a composition varying between these two extremes can be accounted for by the substitution mechanism Ca + PO 4 ↔ Na + CO 3. Although 40% of the carbonate ions of the sodium containing extreme component are on OH − lattice sites, the IR spectrum is very similar to that of an apatite containing carbonate on phosphate sites only.

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