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Synthesis and properties of colored copper-containing apatites of composition Ca5(PO4)(3)CuyO(y + delta)(OH)(0.5-y-delta)X0.5 (X = OH, F, Cl)статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Kazin P.E., Zykin M.A., Tret'yakov Yu D., Jansen M.
- Журнал: Russian Journal of Inorganic Chemistry
- Том: 53
- Номер: 3
- Год издания: 2008
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 362
- Последняя страница: 366
- DOI: 10.1134/S0036023608030042
- Аннотация: Ca-5(PO4)(3)CuyOy + delta(OH)(0.5-y-delta)X-0.5 compounds (for X = OH, y = 0.01-0.3; for X = F, y = 0.01-0.1; for X = Cl, y = 0.1) have been synthesized by heat treatment of oxide-carbonate mixtures at 1150 degrees C in air and have been characterized by X-ray diffraction, electronic spectroscopy, and magnetic measurements. The compounds have an apatite structure in which copper atoms substitute for part of the hydroxyl hydrogen atoms in hexagonal channels. The electronic spectrum shows two main absorption bands due to d-d transitions in copper(II) linearly coordinated to two oxygen atoms, as well as extra, weaker bands, whose contribution to the overall spectrum decreases with decreasing y. The latter are assignable to copper atoms occupying other sites in the crystal lattice. The temperature dependence of the magnetic susceptibility of the compounds obeys the Curie-Weiss law with a Curie constant close to zero. The Weiss constant characterizes the copper(II) content of the compounds and correlates qualitatively with the intensity of the main absorption bands in the visible spectrum. The fraction of copper(II) in the total amount of copper in the apatites increases in the substituent order X: Cl, OH, F, as well as upon the low-temperature annealing of the compounds in air. At the same time, copper(II) fraction depends only slightly on the total copper content. As the copper(II) content increases, the color of apatite changes from pink to dark claret.
- Добавил в систему: Казин Павел Евгеньевич