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Apatite‐Like Complex Oxides in the Ca–Cr–Cu–O System: Synthesis, Crystal Structure, XPS and Magnetic Study
Author(s) -
Bazuev Gennady V.,
Tyutyunnik Alexander P.,
Kuznetsov Michail V.,
Samigullina Rina P.
Publication year - 2016
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201600882
Subject(s) - x ray photoelectron spectroscopy , chemistry , apatite , thermogravimetric analysis , differential thermal analysis , copper , crystal structure , crystallography , inorganic chemistry , mineralogy , diffraction , chemical engineering , organic chemistry , physics , optics , engineering
Calcium chromates Ca 5 (CrO 4 ) 3 Cu x (OH) 1– x with apatite structure and different content of copper and OH – groups have been synthesized by solid‐phase reactions under usual conditions in air. The composition, structure, degree of oxidation of the elements, and the properties of the produced chromates have been characterized by X‐ray diffraction, X‐ray photoelectron spectroscopy (XPS), differential thermal analysis (DTA), thermogravimetric analysis (TGA), and magnetochemical methods. It was concluded that the reason for the apatite stabilization is the introduction of Cu + and Cu 2+ cations into the hexagonal O(4) sites in the tunnels of the Ca 5 (CrO 4 ) 3 OH apatite structure. This is caused by the substitution of OH – according to the scheme OH – → (Cu + O) – or 2 OH – → (Cu 2+ O 2 ) 2– which gives rise to infinite chains along the c ‐axis.