Figure 5

Low-res DSC results (Pt crucibles were used at 10 K/min heating rate under argon atmosphere.) for the 90 < ϕ < 125 μm grainsize fraction. Only ATD and MIL show the α-β-quartz transition at 573°C. MIL shows further secondary peaks between 400 and 700°C manifesting the decomposition of secondary phases. The EYJA sample shows a slight bump between 600 and 750°C. This bump corresponds to the relaxation of the glass phase upon heating (= glass transition interval) and is shown in a more pronounced way in Figure 6.