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

Авторы: Kazin Pavel E., Zykin Mikhail A., Gazizova Olga R., Tretyakov Yury D.
Журнал: Zeitschrift fuer Anorganische und Allgemeine Chemie
Том: 635
Номер: 12
Год издания: 2009
Первая страница: 2072
Последняя страница: 2076
DOI: 10.1002/zaac.200900209
Аннотация: 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.
Добавил в систему: Казин Павел Евгеньевич

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