Development of structural order during supercooling of a fragile oxide melt.
The authors have studied the structural evolution of the fragile glass-forming liquid CaAl2O4 during supercooling from the stable liquid phase to the cold glass below Tg. The evolution is characterized by a sharpening of the first diffraction peak and a shortening of the average nearest-neighbor bond length around 1.25Tg, indicating an increase in the degree of both intermediate-range and short-range orders occurring close to the dynamical crossover temperature. The cooling curve developed a kink at this temperature, indicating a simultaneous change in thermodynamic properties.
Hennet
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Centre de Recherche sur les Matériaux à Haute Température, 45071 Orléans Cedex 2, France. hennet@cnrs-orleans.fr
Pozdnyakova
I
I
Bytchkov
A
A
Price
D L
DL
Greaves
G N
GN
Wilding
M
M
Fearn
S
S
Martin
C M
CM
Thiaudière
D
D
Bérar
J-F
JF
Boudet
N
N
Saboungi
M-L
ML