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The shifts of the SiOSi stretching and the SiOAl and SiOSi bending modes, as well as the free silica peak in the IR spectra and the strengthening of the XRD reflections due to the quartz and α-cristobalite components of the Al-pillared bentonites (Wyoming and Resadiye), are ascribed to the formation of new SiOAl groups of covalent character. The mass losses in the temperature range 150–700 °C correspond...
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