Abstract
The thermal-mechanical properties of 60Si20Mg20RE (RE: rare earth) oxynitride glasses can be tailored by the substitution of rare earths of decreasing ionic size. The Young's modulus, hardness, glass transition temperature and viscosity all increase with the substitution La by Gd and Gd by Lu while the thermal expansion coefficients decrease. Compared to the 55Si25Al20RE oxynitride glasses, replacement of Al by Mg lowers the glass transition temperatures and viscosities and raises the thermal expansion coefficients substantially. On the other hand, the Young's moduli are higher in the Mg-bearing glasses. These behaviors are seen to be a result in changes in the nature of the bonding in the glass structure.
| Original language | English |
|---|---|
| Pages (from-to) | 124-128 |
| Number of pages | 5 |
| Journal | Journal of Non-Crystalline Solids |
| Volume | 333 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 1 2004 |
Funding
The authors acknowledge the technical support of E.A. Kenik, L. Riester, and S.B. Waters of ORNL. The research at ORNL was supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under contract no. DE-AC05-00OR22725 with UT – Battelle. Financial support from the European Community ‘Growth’ Program NANOAM under contract no. GRD2-200-3030351 is acknowledged by R.L. Satet and M.J. Hoffmann.