Crystal Phases and Chemical Stabilities of YSi<sub>2</sub> Powders Fabricated from Low and High Purity Si and Y Powders
- 1 Department of Life, Environment, and Applied Chemistry, Fukuoka Institute of Technology, Fukuoka, Japan
- 2 Department of Life, Environment, and Applied Chemistry, Fukuoka Institute of Technology, Fukuoka, Japan
Abstract
Y-Si compounds with the composition of Y:Si = 1:2 were fabricated using Yttrium and Silicon raw powders with low and high purity in various atmospheres and temperatures. Although the latest Y-Si phase diagram shows that the α - and β -YSi 2 phases are the stable phases for the stoichiometric composition of Y:Si = 1:2, the current experimental results suggest that the high temperature phase with the hexagonal structure, β -Y 3 Si 5 , would be the stable phase for this composition, and that the high temperature phase with the orthorhombic structure, β -YSi 2 , would be the meta-stable phase with high oxygen impurity content. It was demonstrated that YSi 2 powders possess much superior chemical stability than Yttrium metal. It was found that the best dispersing solvent was 2-propanol for YSi 2 powder.
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