Application of FTIR spectra for evaluating interfacial reactions in metal matrix composites

Kúdela Jr., S.; Oswald, S.; Kúdela, S.; Wetzig, K.
March 2008
Analytical & Bioanalytical Chemistry;Mar2008, Vol. 390 Issue 6, p1477
Academic Journal
Manufacturing of Saffil/MgLi metal matrix composites by the melt infiltration process is accompanied by extensive interfacial redox reaction between δ-Al2O3 fibers (Saffil) and lithium. The present paper deals with the Fourier transform infrared spectroscopy examination of Saffil fibers isolated from Mg–8 wt% Li alloy by the bromine/methylacetate agent focusing on the insertion of Li+ ions into δ-Al2O3 and their influence on water adsorption. Insertion of Li+ into δ-Al2O3 is monitored by gradual change of Al–O stretching bands (400–900 cm−1) towards more simple patterns of a spinel-like product assigned as δ(Li) which transforms to LiAl5O8 during subsequent annealing. Rapid increase in the water adsorption with increase in Li content, indicated by the changes in H–O–H bending (about 1,650 cm−1) and O–H stretching (about 3,500 cm−1), is connected with the ionicity of the δ(Li) phase, which attracts polar water molecules.


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