Fig. 2
From: Pressureless glass crystallization of transparent yttrium aluminum garnet-based nanoceramics
Crystallization process of the AY26 glass precursor into YAG-Al2O3 composite nanoceramics. a Differential scanning calorimetry measurement of the AY26 glass precursor showing the glass transition at 887±1 °C and a strong exothermic peak corresponding to crystallization of both YAG and δ-Al2O3 phases at 931±1 °C followed by two broad exothermic peaks corresponding to the δ-Al2O3 → θ-Al2O3 (Tonset = 1061 °C; Tpeak = 1164 °C) and θ-Al2O3 → α-Al2O3 (Tonset = 1292 °C; Tpeak = 1329 °C) transitions. b Evolution of the YAG and Al2O3 polymorphs contents versus treatment (left vertical axis). The evolution of the crystallite size (right vertical axis) versus temperature is also presented. c In situ X-ray powder diffractograms collected upon heating from the AY26 glass powder sample. The indexation corresponds to the YAG garnet structure (PDF 70-7794). d Enlargement showing the Al2O3 structural evolution
