Viscosity of RE-Mg-Si-O-N(RE = Y, Gd, Nd and La) melts

Sohei Sukenaga, Daiji Nakata, Tomoyasu Ichiki, Noritaka Saito, Kunihiko Nakashima

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Viscosities of the molten RE-Mg-Si-O-N(RE = Y, Gd, Nd and La) glasses have been measured using a newly-developed rotational viscometer with gas tight furnace. Effects of nitrogen and rare-earth additives on the viscosities of RE-Mg-Si-O-N melts have been investigated systematically at elevated temperature (∼1873 K). The viscosities of molten RE-Mg-Si-O-N glasses exponentially increased with nitrogen content, which indicates that the substitution of nitrogen for oxygen in the melts may lead to a high average coordination of nonmetal atoms, and that the increase of cross-linking produces a more rigid network structure. The viscosities of RE-Mg-Si-O-N melts were found to decrease in the order of cationic radius of rare-earth elements, which suggests that larger rare-earth elements behave as a stronger network modifier of complex silicate or silicon-oxynitride anions in elevated temperature melts. Additionally, the viscosity of the smaller rare earth containing oxynitride melt indicated more sensitive increase with nitrogen content.

Original languageEnglish
Pages (from-to)1050-1056
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number11
Publication statusPublished - 2007 Nov
Externally publishedYes


  • Cationic radius of rare-earth
  • Molten oxynitride
  • Rare-earth elements
  • Viscosity

ASJC Scopus subject areas

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


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