Two series of xerogels (desiccated hydrogels), one consisting of single phases and the other of two phases, were prepared from organic and inorganic precursors in the system Al 2 o 3 ‐Sio 2 . The effect of these nanostructural differences in the xerogel powders on the energy content and behavior on heating were studied using DTA, powder X‐ray diffraction, and ultrafast heating on a strip furnace. The results demonstrate that diphasic xerogels are substantially different materials from single‐phase xerogels of the same composition.
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Hoffman et al. (1984) studied this question.
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