Rg. Duan et al., A STUDY ON THE MECHANISM OF CRYSTAL-GROWTH IN THE PROCESS OF CRYSTALLIZATION OF GLASSES, Materials research bulletin, 33(8), 1998, pp. 1143-1149
This paper investigates the CaO-Al2O3-SiO2 system glass. When the glas
ses were heat treated at different temperatures and times, they crysta
llized from the surface. The main crystals were dendrites of anorthite
(CaAl2Si2O8). The morphology of crystallization was observed using sc
anning electron microscopy, and the crystal size was measured by optic
al microscopy. It was found that the growth of anorthite (CaAl2Si2O8)
crystals was diffusion controlled. The apparent activation energy for
crystal growth was about 581 kJ/mol. The rate of crystal growth was no
t constant during the growth process; the rate was highest at the begi
nning of crystallization and gradually decreased with increasing time.
The higher the temperature, the less time required to complete crysta
l growth. The total process of diffusion may be determined by the diff
usion rate of Ca2+. 1998 Elsevier Science Ltd.