Crystallinity, crystallisation phase analysis

Mixed-oxide compounds of potential usefulness for fibre coatings were prepared by hybrid sol-gel synthesis and their thermal crystallization was monitored by thermal analysis and XRD [95]. Both the gels convert to the crystalline phase below about 1200 °C, via amorphous intermediates. Lanthanum hexaluminate crystallises sharply at 1230 via y-Al203. 

Previously reported thermal analysis data (Brown et al., 2006 Kirchner et al., 2007a, 2008) shows that further heating causes a sharp exothermic event due to formation of crystalline transition alumina phase(s). This event occurs at 850 °C for H3PO4 electrolyte, 900 °C for H2C2O4 electrolyte and 970 °C for H2SO4 eledrolyte, although the precise crystallisation... 

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