Al-doped apatite-type nanocrystalline lanthanum silicates prepared by mechanochemical synthesis: Phase, structural and microstructural study
authors Kharlamova, T; Pavlova, S; Sadykov, V; Chaikina, M; Krieger, T; Lapina, O; Khabibulin, D; Ishchenko, A; Zaikovskii, V; Argirusis, C; Frade, J
nationality International
journal EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
author keywords apatite-type silicates; conducting materials; doping; mechanochemical synthesis; formation mechanism
keywords OXIDE FUEL-CELLS; SOL-GEL PROCESS; IONIC-CONDUCTIVITY; OXYAPATITE; ROUTE; GD; ND; SM; DY; LA9.33SI6O26
abstract Al-doped La(9.33+x/3+y)Si(6-x)Al(x)O(26+3y/2) (x = 0-1.5, y = 0-0.67) apatite-type lanthanum silicates (ATLS) were synthesized with a high-power (1200 rpm) planetary ball mill that allows the formation of the lanthanum silicate phase after milling for 20-35 min at room temperature. The apatite phase already appears after milling for 5 min. Phase, structural and microstructural studies on the nanocrystalline lanthanum silicates were carried out by using XRD, TEM, and IR, (27)Al and (29)Si MAS NMR spectroscopy to clarify the mechanism of ATLS formation. The cluster-topotactic mechanism of the formation of apatite by mechanochemical treatment involving hydration of the starting compounds and acid-base reactions is suggested, Al-doping results in promoting the formation of apatite. However, a secondary LaAlO(3) phase may be present in the sample depending on its stoichiometry. This suggests the existence of a biphase domain in the La(2)O(3)-SiO(2)-Al(2)O(3) phase diagram at room temperature, in which Al-doped apatite and LaAlO(3) phases coexist. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008).
publisher WILEY-BLACKWELL
issn 1434-1948
year published 2008
issue 6
beginning page 939
ending page 947
digital object identifier (doi) 10.1002/ejic.200700972
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000254593900018
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