Introduction of Copper Ions in the Hexagonal Channels of the Apatite Type La-Sr and La-Ca Silicatesстатья

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[1] Introduction of copper ions in the hexagonal channels of the apatite type la-sr and la-ca silicates / P. E. Kazin, M. A. Zykin, O. R. Gazizova, Y. D. Tretyakov // Zeitschrift fuer Anorganische und Allgemeine Chemie. — 2009. — Vol. 635, no. 12. — P. 2072–2076. Copper-containing and copper-free La-M (M = Sr, Ca) silicates with an apatite-type structure were prepared by solid state reaction at 1400 degrees C in air. Samples were studied by powder X-ray diffraction, electron microscopy with EDX analysis, and magnetic measurements. The crystal structures of the samples were refined by the Rietveld method. Copper was incorporated into the hexagonal channels forming linear O-Cu-O groups with the site occupancies lip to 0.37 for M = Sr and 0.31 for M = Ca. The impact of the introduced copper was a substantial increase of the hexagonal channel diameter and a somewhat smaller increase of the lattice parameters. Copper-containing samples were diamagnetic and not brightly colored in contrast to copper-doped phosphate apatites. [ DOI ]

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