Mechanochemical Synthesis of Fe-Doped Apatite-Type Lanthanum Silicates

作者：Kharlamova Tamara^*; Pavlova Svetlana; Sadykov Vladislav; Chaikina Marina; Krieger Tamara; Ishchenko Arcady; Pavlyukhin Yurii; Petrov Sergei; Argirusis Christos

来源：European Journal of Inorganic Chemistry, 2010, (4): 589-601.

DOI：10.1002/ejic.200900867

• Lanthanum
• Silicates
• Doping
• Mechanical activation
• Topochemistry

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 Mossbauer 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 alpha-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.

• 出版日期2010-2