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MINERALOGICAL Syntheses M Mn jOlTRNAL VOL 11 No 7 PP 317 330 and superstructures L LY 1983 of Cd MMP04 30H Fe Co Ni Cu Hg Mayumi HA TA and Fumiyuki MARUMO Research Laboratory of Engineering Materials Tokyo Nagatsuta 4259 Midori ku Yokohama 227 Japan Institute of Technology Abstract 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 and Z 6 and has more distorted P04 tetrahedra than the structure of pure Cd PO 30H Introduction Sinee N ray Szab 1930 and Mehmel 1930 determined of apatite independently apatite group eompounds the erystal strueture many works have been reported on the strueture of Most of them belong to the hexagonal eentrosymme trie spaee group P63 rn A few of them belong to the monoclinie spaee group PZ jb and transform into the hexagonal P63 rn phase at about ZOO C Prener 1967 Although apatite is known to eontain many kinds of atoms substituting for Ca P or F few kinds of divalent transition elements eonstitute the apatite strueture The smallest metallie ion whieh forms ehlorapatite is Mn2 Kreider and Hummel 1970 and that whieh forms hydroxyapatite is Cd2 I Iata et al 1978 The



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