Crystals, apatite-like in structure, with composition M9+yNax(PO4)6Bx+2yO2(M = Ca or Sr) have been obtained by the direct reaction of M3P2O8 and Na2B4O7; these crystals contain O–B–O groupings with the B atom on an inversion centre and with B–O bond lengths of 1·25 ± 0·02 Å;.
C. Calvo and R. Faggiani, J. Chem. Soc., Chem. Commun., 1974, 714 DOI: 10.1039/C39740000714
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