Properties and structure of (1−x)Li2O–xNa2O–Al2O3–4SiO2 glass systems

Structural dependence of crystallization in glasses along the nepheline (NaAlSiO4) ‐ eucryptite (LiAlSiO4) join

“…While numerous studies have been conducted on the NaAlSiO 4 ‐SiO 2 system, the LiAlSiO 4 ‐SiO 2 system, and the Li 2 SiO 3 ‐LiAlSiO 4 system, only a few have been conducted on the (Li,Na)AlSiO 4 system, as described below. Some notable studies on the alkali‐substituted spodumene system (Li,Na)AlSi 2 O 6 include that of Wang et al…”

Crystallization behavior of (1−x)Li2O·xNa2O·Al2O3·4SiO2 glasses

“…Moreover, the T c abrupt increases from 1186.7 to 1212.4 K when the Na 2 O content increased from 0.4 to 0.6 mol (i.e. C 3 , C 4 and C 5 glasses) [16]. Hence, the crystallization process temperatures can be divided into two groups: (i) from 1153 to 1273 K for C 1 and C 2 glasses and (ii) from 1273 to 1363 K for C 3 , C 4 and C 5 glasses.…”

“…This result may be caused by the T c which increases with the Na 2 O content increased from 0 to 0.6 mol (i.e. for C 1 to C 5 glasses), but the T c of C 6 and C 7 does not appear when the Na 2 O contents are 0.8 and 1.0 mol due to the abrupt change of the dilatometric softening temperatures [16]. In the present study, at the crystallization process, the viscosity of residual glass increases with the Na 2 O content increasing, which inhibited the ␤-sprodumene formation, and results in that the ␤-sprodumene content decreases with the Na 2 O content increasing.…”

“…In the present study, at the crystallization process, the viscosity of residual glass increases with the Na 2 O content increasing, which inhibited the ␤-sprodumene formation, and results in that the ␤-sprodumene content decreases with the Na 2 O content increasing. Wang et al [16] and Tomozawa [31] have pointed out that the alkali ion mobility in oxide glasses decreases drastically when x exceeds 0.4 mol causing an increase in activation energy as shown in Fig. 5.…”

“…[11,12] and Li 2 O·CaO·Al 2 O 3 ·SiO 2 [13][14][15][16][17][18] glass-ceramics have been discussed in detail. The effect of Na 2 O substation on the structure and properties of (1 − x)Li 2 O·xNa 2 O·Al 2 O 3 ·4SiO 2 glasses has also been reported by Wang et al [16]. However, an extensive literature search shows that the detail of the crystallization behavior of (1 − x)Li 2 O·xNa 2 O·Al 2 O 3 ·4SiO 2 glasses has not been elaborated so far.…”