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Mechanochemical Synthesis of Fe‐Doped Apatite‐Type Lanthanum Silicates
Author(s) -
Kharlamova Tamara,
Pavlova Svetlana,
Sadykov Vladislav,
Chaikina Marina,
Krieger Tamara,
Ishchenko Arcady,
Pavlyukhin Yurii,
Petrov Sergei,
Argirusis Christos
Publication year - 2010
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.200900867
Subject(s) - apatite , dopant , chemistry , lanthanum , amorphous solid , mineralogy , chemical engineering , doping , inorganic chemistry , crystallography , materials science , optoelectronics , engineering
Apatite‐type lanthanum silicates (ATLS) doped by Fe were prepared by using mechanical activation, and the effect of the nature of the dopant raw materials on the formation of ATLS was considered. Genesis of the formation of apatite was studied by XRD, IR, HRTEM, and Mössbauer and UV/Vis electron spectroscopy. The possibility of a partial substitution of Si in the apatite with a dopant and the mechanism of formation of ATLS in the course of mechanical activation depend on the dopant parent compound. The structural compatibility of La 2 O 3 , La(OH) 3 , and apatite was shown to favor the rapid formation of apatite‐type silicate by a cluster‐topotactic mechanism during mechanical activation, and the formation of an amorphous ferrosilicate intermediate in the case of the La(NO 3 ) 3 /SiO 2 precursor favors dopant incorporation into the apatite. However, dopant incorporation into the apatite structure was shown to be partially or fully hampered through milling when FeO(OH) and α‐Fe 2 O 3 are used as reagents. Using crystalline hydrates as dopant precursors was shown to result in the formation of apatite through a dissociative mechanism.