Abstract
Elevated concentrations of P2O5 of 2–12 wt% absolute were observed in the matrices of a small group of ceramics with the electron microprobe. P2O5, CaO and FeOt are enriched towards the surfaces in some cases and elemental correlations suggest precipitation of a crystalline calcium phosphate with a stoichiometry close to CaO · P2O5. Scanning electron microscopy with X‐ray mapping showed P2O5 to be dispersed in the ceramic matrix on a very fine scale, while X‐ray diffraction detected no crystalline phosphate. Parallels are drawn with the precipitation of phosphate in the surfaces of weathered glass. It is concluded that the amorphous phases produced on firing behave as chemically active substrates which facilitate the adsorption or precipitation of very fine grained calcium phosphate from the burial environment.
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