Sol gel synthesis and spark plasma sintering of lanthana-doped alumina glass

Preparation of Ce-doped (Y,Gd)3Al5O12 nanoceramics by sintering and crystallization of glass microspheres

“…The presence of crystalline microspheres has also been reported by others in the flame-sprayed amorphous samples [22,23]. The deviation in composition from the desired eutectic values is considered to be the main cause for the formation of crystalline microspheres [24]. However, the designed YAG phase is away from the eutectic composition in the Y 2 O 3 -Al 2 O 3 equilibrium phase diagram [25].…”

“…They attributed it to the strong tendency of the glass toward crystallization (K H = 0.05) and the ability of Si 4+ to be accommodated into the YAG crystal structure. Fredrick et al [24] reported the crystallization of La 2 O 3 -Al 2 O 3 glass (K H = 0.068) below T x as a result of applied electric field during sintering. Compared with the reported results, our prepared glass microspheres present smaller K H values.…”