Crystallization of Y3Al5O12 garnet from deep undercooled melt effect of the Al-Ga substitution
被引:30
作者:
Gervais, M
论文数: 0引用数: 0
h-index: 0
机构:Ctr. Rech. Phys. Hautes T., CNRS
Gervais, M
Le Floch, S
论文数: 0引用数: 0
h-index: 0
机构:Ctr. Rech. Phys. Hautes T., CNRS
Le Floch, S
Gautier, N
论文数: 0引用数: 0
h-index: 0
机构:Ctr. Rech. Phys. Hautes T., CNRS
Gautier, N
Massiot, D
论文数: 0引用数: 0
h-index: 0
机构:Ctr. Rech. Phys. Hautes T., CNRS
Massiot, D
Coutures, JP
论文数: 0引用数: 0
h-index: 0
机构:Ctr. Rech. Phys. Hautes T., CNRS
Coutures, JP
机构:
[1] Ctr. Rech. Phys. Hautes T., CNRS
来源:
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY
|
1997年
/
45卷
/
1-3期
关键词:
yttrium aluminum garnet;
rapid solidification;
metastability;
Al-27 MAS NMR;
D O I:
10.1016/S0921-5107(96)02032-6
中图分类号:
T [工业技术];
学科分类号:
08 ;
摘要:
Melts of garnet Y3Al5O12 and compositions lying on both sides of this compound were rapidly cooled in contactless conditions by using an aerodynamic levitation device coupled with a CO2 laser. The crystallized phases were analyzed at room temperature by XRD and Al-17 MAS NMR. As the temperature reached by the supercooled melt decreases. the solidification was shown to lead successively to a mixture of YAlO3 and Al2O3, a monophasic garnet type structure and a glass. The formation of Y3Al5O12 starts at about 920 degrees C under the melting temperature and only 50 degrees C above the glass transition temperature. The solidification behaviour of liquid Y3Al5-xGaxO12 (x = 0.5, l) was similar. Results clearly show the difficulties of garnet to nucleate. They are consistent with a rapid increase of the melt viscosity in the temperature range just above the formation of glass. (C) 1997 Elsevier Science B.V.