Structure and crystallization behaviour of some MgSiO3-based glasses

Effect of A2O3 (A=La, Y, Cr, Al) on thermal and crystallization kinetics of borosilicate glass sealants for solid oxide fuel cells

“…The transmittance band in the 650-800 cm À1 region in the glasses is attributed to the bending vibrations of bridging oxygen between trigonal boron atoms and it is also related to the stretching vibrations of the A-O bonds with A 3+ ions in four-fold coordination (A = Y, Cr, La, Al) [24]. The band in the region 1350-1500 cm À1 corresponds to B-O vibrations in BO 3 triangle.…”

“…9(a) and (b). The heat treated glass exhibit an additional band around 1200 cm À1 which is due to hexacelsian [24]. In case of BaCr glass and glass ceramic Fig.…”

Structured catalysts based on sepiolite with tailored porosity to remove diesel soot

“…Although these last species have not been detected by XRD due to their low concentration or crystallinity, they are frequently found in natural clay. When the clay is calcined at 850 • C the absorption intensities associated with the sepiolite structure decrease, whereas new bands corresponding to the clinoenstatite structure (MgSiO 3 ) appear at 425, 513, 665, 733, 965, 1080 and 1429 cm −1 [23].…”

Effect of Crystallization on Thermal Properties of (1−x)CaAl2Si2O8-xCaMgSi2O6

“…However, T p of glass was decreased up to x = 0.3, and then increased. A parameter usually employed to estimate the glass stability is the difference of T c from T g [7,8]. T c of the unstable glasses is close to T g .…”