Fellow, The American Ceramic Society.
Y4Si2O7N2: A New Oxynitride with Low Thermal Conductivity
Article first published online: 27 AUG 2012
© 2012 The American Ceramic Society
Journal of the American Ceramic Society
Volume 95, Issue 10, pages 3278–3284, October 2012
How to Cite
Sun, L., Liu, B., Wang, J., Wang, J., Zhou, Y., Hu, Z. (2012), Y4Si2O7N2: A New Oxynitride with Low Thermal Conductivity. Journal of the American Ceramic Society, 95: 3278–3284. doi: 10.1111/j.1551-2916.2012.05389.x
- Issue published online: 2 OCT 2012
- Article first published online: 27 AUG 2012
- Manuscript Accepted: 1 JUL 2012
- Manuscript Received: 14 FEB 2012
- Natural Sciences Foundation of China. Grant Numbers: 50672102, 50832008, 51032006
Search for new thermal barrier materials with high-temperature stability is very difficult because there are intractable choices among thousands of possible candidates. The present paper shows that identifying and developing new low thermal conductivity materials can be accomplished by first-principles calculations of equilibrium crystal structure and elasticity, and thereafter making theoretical prediction of minimum high-temperature lattice thermal conductivity basing on David Clarke's method for insulating materials. We highlight a new oxynitride ceramic, Y4Si2O7N2, with a low theoretical minimum thermal conductivity of 1.12 W·m−1·K−1. The theoretical result is further validated by experimental measurement of thermal conductivity of dense and bulk Y4Si2O7N2. The experimental thermal conductivity is 1.50 W·m−1·K−1 at 1300 K. Furthermore, thermal properties of Y4Si2O7N2 are investigated for evaluating its potential performances.