Preparation and Characterization of Porous Yttrium Oxide Powders with High Specific Surface Area

• Published in: Journal of rare earths Vol. 24; no. 1; pp. 34 - 38
• Main Author: 李永绣 林小云 王义振 罗军明 孙伟丽
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2006; Research Center for Rare Earths & Micro/nano Functional Materials, Nanchang University, Nanchang 330047, China
• Subjects: explosive decomposition; high surface area; porous yttrium oxide; rare earths; 多孔材料; 氧化钇; 粉末冶金; explosive decomposition; porous yttrium oxide; high surface area; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(06)60061-6

The porous cubic yttrium oxides with high specific surface area were prepared yttrium nitrate and its complex formed with methyl salicylate. The specific surface area by the explosive decomposition of and properties of powders synthesized at various temperatures were characterized using BET, X-ray diffraction （XRD）, infrared spectra （IR）, and scanning electron microscopy （SEM）. The results indicate that the highest specific surface area is found to be 65.37 m^2·g^-1 at the calcination temperature of 600 ℃, and then decreases to 20.33 m2· g^- 1 with the calcination temperature rising from 600 to 900 ℃. The powders show strong surface activity for adsorping water and carbon dioxide in air, which also decreases with the rising calcination temperature. The drop both on the surface area and surface activity of samples at higher temperatures may be due to pore-narrowing（sintering） effects.