A first mass decay occurs in the temperature range 20–130 C (Tmax 40 C),corresponding to ca. 2% of the initial mass. Comparable mass losses have been reported in the literature, both in N2 [25] and air [26]atmospheres, attributable to the evaporation of water adsorbed
on the sample. A second mass decay, ranging from ca. 200 to >500 C involves different events and needs a detailed study. A first event, in the temperature range 200–330 C (Tmax 310 C)