Hello,
In our current study on calcium silica-phosphate composite (CSPC), Ca6Na3(PO4)5 was among the crystalline phases found after XRD analysis of our mixtures. Unfortunately, this phase corresponded well to a unique ICDD card (ICDD card No. 011-0236) which is a blank card and has no crystal parameters in it (neither lattice parameters, nor atomic positions).
I also try to identify -at least- the atom positions, keeping the same stoichiometry and substituting each atom in Ca6Na3(PO4)5 by another atom that has the same covalent (If the structure existed, we could find the same diffraction peaks but with some shift of angle because of the difference of atomic radii); for example: replace "Ca" by "Mg" and/or "Na" by "K" and/or "P" by "As"... but we get nothing. I consulted all the databases (COD, ICDD, ICSD) and articles I found.
Please help me to find a solution.
you can find crystallographic parameters of Ca6Na3(PO4)5 expermentally
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