Crystal Phases and Chemical Stabilities of YSi₂ Powders Fabricated from Low and High Purity Si and Y Powders  

作　　者：Ren Matsushima Mikito Kitayama Ren Matsushima;Mikito Kitayama(Department of Life, Environment, and Applied Chemistry, Fukuoka Institute of Technology, Fukuoka, Japan)

机构地区：[1]Department of Life, Environment, and Applied Chemistry, Fukuoka Institute of Technology, Fukuoka, Japan

出　　处：《Journal of Materials Science and Chemical Engineering》2022年第2期18-28,共11页材料科学与化学工程（英文）

摘　　要：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-YSi₂ 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-Y₃Si₅, would be the stable phase for this composition, and that the high temperature phase with the orthorhombic structure, β-YSi₂, would be the meta-stable phase with high oxygen impurity content. It was demonstrated that YSi₂ powders possess much superior chemical stability than Yttrium metal. It was found that the best dispersing solvent was 2-propanol for YSi₂ powder.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-YSi₂ 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-Y₃Si₅, would be the stable phase for this composition, and that the high temperature phase with the orthorhombic structure, β-YSi₂, would be the meta-stable phase with high oxygen impurity content. It was demonstrated that YSi₂ powders possess much superior chemical stability than Yttrium metal. It was found that the best dispersing solvent was 2-propanol for YSi₂ powder.

关 键 词：YSi₂ Yttrium Silicide Crystal Phase Chemical Stability Oxygen Impurity 

分 类 号：TG1[金属学及工艺—金属学]