Syntheses and superstructures of ( Cd , MMP 04 ) 30 H ( M = Mn , Fe , Co , Ni , Cu , Hg )
نویسندگان
چکیده
Divalent ions of the first series transition elements and Hg were introduced into a cadmium hydroxyapatite Cd5 (P04) 30H by replacing a part of Cd2+, and the effects on the crystal growths and the structural changes were studied. Cd2+ can be exchanged with Mn2+ up to about 30 mol %, with N¡Z+or Hg2+ up to about 10 mol %, and with a little amount of Fe2+ or Cu2+. It was found that Cd5 (PO.)sOH forms a superstructure when it contains a small amount of Mn2+, Fe2+, C02+, N¡Z+, Cu2+ or Hg2+ ion. Infrared spectra of Cd5 (PO.) 30H containing these ions show some new bands in addition to those of Cd5 (PO.) 30H. The average structures of the crystals containing a small amount of Hg2+ and Ni2+, and the superstructure of the crystal containing Mn2+ were refined with the full-matrix least-squares method, although the amounts and sites of the substituting ions could not be determined except for the crystals containing Hg2+. The superstructure belongs to P63 (a=16.l990(3), c=6.6485(1)Á and Z=6) and has more distorted P04 tetrahedra than the structure of pure Cdú (PO.) 30H.
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