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Glasses with the general compositions xNd  2 O 3 .20Al 2 O 3 .(80–x)SiO 2  and 15Nd 2 O 3 .yAl 2 O 3 .(85–y)SiO 2  (x = 10, 15, 20, and y = 20, 25, 30) were prepared by melting at 1550°C. The glasses also contained varying amounts of TiO 2  as nucleating agent. The microstructural evolution of the undoped and TiO 2 -containing glass-ceramics was then studied. Crystallization of the glasses was feasible in the range 1000° to 1250°C. The crystallization rates were evaluated. TiO 2  addition influenced only the growth rate and not the nucleation of the crystalline phases observed in this study. Glasses of higher SiO 2  content showed a rise in growth rate. It was found that when TiO 2  was present, a new unreported crystalline compound with the stoichiometric composition of TiO 2 .Nd 2 O 3 .Al 2 O 3 .2SiO 2  was formed

The Formation of a New Phase during Crystallization of TiO 2 -Doped Nd 2 O 3 -Al 2 O 3 -SiO 2 Glasses