TY - JOUR
T1 - Self-limited growth of nanocrystals in phosphosilicate melts during cooling
AU - Liu, S.J.
AU - Lan, S. L.
AU - Tao, H.Z.
AU - Yue, Yuanzheng
PY - 2019/10
Y1 - 2019/10
N2 - In this Letter, we demonstrate that the spontaneous nanophase-separation can greatly enhance the heterogeneous nucleation in the investigated phosphosilicate melts. The two separated phases are found to be the phosphate-rich phase as the floppy domain and the silicate-rich phases as rigid phase. We found that sodium phosphate nanocrystals form in the phosphate-rich phase during melt cooling. The growth of these nanocrystals are self-limited, i.e., limited by the surrounding silicate-rich phase with higher viscosity, and hence lower ionic diffusion compared to the phosphate-rich phase. Our results show that the substitution of B
2O
3 or Al
2O
3 for partial Na
2O enhances the spontaneous nucleation, although the viscosity of silicate-rich matrix phase is increased by such substitution. This implies that the compositional substitution enhances nanophase separation and thereby lowers the activation energy for non-isothermal crystallization. This work indicates that nanophase separation is crucial for fabrication of transparent glass-ceramics from phosphosilicate melts.
AB - In this Letter, we demonstrate that the spontaneous nanophase-separation can greatly enhance the heterogeneous nucleation in the investigated phosphosilicate melts. The two separated phases are found to be the phosphate-rich phase as the floppy domain and the silicate-rich phases as rigid phase. We found that sodium phosphate nanocrystals form in the phosphate-rich phase during melt cooling. The growth of these nanocrystals are self-limited, i.e., limited by the surrounding silicate-rich phase with higher viscosity, and hence lower ionic diffusion compared to the phosphate-rich phase. Our results show that the substitution of B
2O
3 or Al
2O
3 for partial Na
2O enhances the spontaneous nucleation, although the viscosity of silicate-rich matrix phase is increased by such substitution. This implies that the compositional substitution enhances nanophase separation and thereby lowers the activation energy for non-isothermal crystallization. This work indicates that nanophase separation is crucial for fabrication of transparent glass-ceramics from phosphosilicate melts.
KW - Melt–cooling–devitrification
KW - Percolation theory
KW - Phosphosilicate glass
KW - Self-limited crystal growth
KW - Transparent glass ceramics
UR - http://www.scopus.com/inward/record.url?scp=85065059902&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2019.04.050
DO - 10.1016/j.jeurceramsoc.2019.04.050
M3 - Journal article
SN - 0955-2219
VL - 39
SP - 3876
EP - 3882
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 13
ER -