TY - JOUR
T1 - Clarifying the gel-to-glass transformation in Al2O3-SiO2 systems
AU - Liu, Shujiang
AU - Boffa, Vittorio
AU - Yang, D.L.
AU - Fan, Z.K.
AU - Meng, F.P.
AU - Yue, Yuanzheng
PY - 2018
Y1 - 2018
N2 - In this paper, we clarify the gel-to-glass (G-G) transformation behavior of the sol-gel derived xAl
2O
3-(100 − x)SiO
2 (x = 0, 10, 20 and 30 mol) systems by differential scanning calorimetry, X-ray diffraction, infrared (IR) spectroscopy and transmission electron microscopy. The SiO
2-Al
2O
3 gels exhibit lower G-G transition temperature than the pure SiO
2 reference gel. Adding Al
2O
3 to the SiO
2 gel can suppress the dependence of glass transition temperature (T
g) on hydroxyl concentration, and this effect is attributed to the highly cross-linked structure in alumina-silica gels. In addition, the Al-rich phase separates from the Si-rich matrix phase, and such immiscibility increases with increasing Al
2O
3 content. This behavior is similar to that of the melt-quenched alumina-silica glasses.
AB - In this paper, we clarify the gel-to-glass (G-G) transformation behavior of the sol-gel derived xAl
2O
3-(100 − x)SiO
2 (x = 0, 10, 20 and 30 mol) systems by differential scanning calorimetry, X-ray diffraction, infrared (IR) spectroscopy and transmission electron microscopy. The SiO
2-Al
2O
3 gels exhibit lower G-G transition temperature than the pure SiO
2 reference gel. Adding Al
2O
3 to the SiO
2 gel can suppress the dependence of glass transition temperature (T
g) on hydroxyl concentration, and this effect is attributed to the highly cross-linked structure in alumina-silica gels. In addition, the Al-rich phase separates from the Si-rich matrix phase, and such immiscibility increases with increasing Al
2O
3 content. This behavior is similar to that of the melt-quenched alumina-silica glasses.
KW - Gel-to-glass transformation
KW - Glass transition
KW - Immiscibility
KW - SiO -Al O gel
UR - http://www.scopus.com/inward/record.url?scp=85045556044&partnerID=8YFLogxK
U2 - 10.1016/j.jnoncrysol.2018.03.049
DO - 10.1016/j.jnoncrysol.2018.03.049
M3 - Journal article
SN - 0022-3093
VL - 492
SP - 77
EP - 83
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
ER -