Solubility of silicon nitride into RE (RE = Y, Gd, Nd and La)-Mg-Si-O-N melts and hardness of glasses

Noritaka Saito, Shinichi Shiota, Ayumu Umemoto, Kunihiko Nakashima

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The solubility of α-silicon nitride into RE2O3 (RE = Y, Gd, Nd and La) -MgO-SiO2 melts have been examined systematically. The effect of nitrogen content on the Vickers hardness of RE-Mg-Si-O-N oxynitride glasses have been examined. The dissolution reaction of α-silicon nitride into melts have achieved equilibrium about 6 h holding at 1773 K. The content of saturated nitrogen was 4.8-5.8 at%, depending on the ionic radius of adding rare-earth elements. A marked change was observed in the order of ionic radius from La to Y. The Vickers hardness of RE-Mg-Si-O-N oxynitride glasses increased with increasing the content of nitrogen. The results from X-ray photo-electron spectroscopy of oxynitride glasses revealed the existence of Si ≡ N bonds. These results suggest that the substitution of nitrogen for oxygen may lead to the increase of cross-linking produces a more rigid glass network.

Original languageEnglish
Pages (from-to)519-522
Number of pages4
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume68
Issue number8
DOIs
Publication statusPublished - Jan 1 2004

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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