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Information × Registration Number 0308U001758, 0106U001955 , R & D reports Title Substitution of alkaliearth elements on rare earths and of phosphate-ion on other anions in apatite structure. popup.stage_title Ізоморфне заміщення стронцію і барію на рідкісноземельні елементи в гідроксиапатиті ванадію. Робота над базою даних ізоморфних заміщень. Head Getman Evgenij Ivanovich, Registration Date 29-02-2008 Organization Donetsk National University popup.description2 Conditions of synthesis of solid solutions were determined for the systems: Sr10-xLnx (VO4)6 (OH) 2-xOx, Sr10-xBax(VO4)6(OH)2 and Sr10(VO4)6-x(PO4)x(OH)2 , where Ln - La, Pr, Nd, Sm, Eu, Gd; the limits of isomorphous substitutions were found. Obtained materials were investigated by the methods of X-ray powder diffraction , IR-spectroscopy, spectroscopy of diffuse reflection, chemical and thermogravimetric analysis. It was shown, that in the Sr10-xLnx(VO4)6(OH)2-xOx, systems the limits of replacement are de-fined by the difference of ionic radii of Sr2 + and REE which substi-tutes it, and also by ionization potential of REE. Changes of intera-tomic distances in structure of apatite are determined. It is established, that REE ions are located mainly in the position of Sr (1) of the crystal structure, and barium – in the position of Sr (2). Product Description popup.authors popup.nrat_date 2020-04-02 Close