Abstract
The <1 μm fraction of a trans-vacant 1M illite (RM30) was studied by conventional and synchrotron X-ray diffraction (XRD) techniques, combined with thermogravimetric (TG, DTG) methods to investigate the structural transformation of illite at different temperatures and degrees of dehydroxylation (DT). The oriented specimens preheated at 300 and 680 °C correspond to the non-dehydroxylated (DT = 0) and completely dehydroxylated (DT = 100%) 1 M illite structures. Deviation of the basal reflection positions from rationality, expressed by the coefficient of variation of d(00l) values, progressively increase from 0.05 at DT = 4%, to 0.14 at DT = 51%, and then decrease to 0.06 at DT = 95%. Similarly, for each 00l reflection the full width at half-maximum (FWHM) shows a bell-like evolution with increasing preheating temperature. Both of these features are characteristic for mixed-layered structures.
Published Version
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