Reaction-Formed Porous Yb4Si2N2O7 Materials with Uniform Open-Cell Network Structure
A novel porous Yb4Si2O7N2 material with uniform open-cell network structure was fabricated from the reaction between Si3N4, Yb2O3, and SiO2. The formation of Yb4Si2O7N2 during heating was studied using X-ray diffractometry. The porous structure was characterized using scanning electron microscopy and mercury porosimeter. It is shown that the formation of Yb4Si2O7N2 phase starts at ∼1150°C and completes at 1350°C for 4 h, accompanied by the development of open-cell network structure. The necks between Yb4Si2O7N2 particles become much thicker with increasing temperature because of the coarsening of Yb4Si2O7N2 particles, thus leading to a uniform three-dimensional network structure. Furthermore, the pore size can be well controlled by adjusting reacting temperature and altering atmosphere.
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Document Type: Research Article
Affiliations: Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Moriyama-ku, Nagoya 463-8560, Japan
Publication date: May 1, 2005