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

Noritaka Saito, Daiji Nakata, Sohei Sukenaga, Kunihiko Nakashima

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2 Citations (Scopus)


Viscosities of molten RE-Mg-Si-O-N (RE=Y, Gd, Nd and La) glasses have been measured using rotating bob viscometer with a gas tight furnace at elevated temperature (∼1873 K). Moreover, structural characterizations of these quenched vitreous samples have been investigated using solid state 29Si MAS-NMR, which would resolve the relationship between the viscosity of high temperature melts and network structure of RE-Mg-Si-O-N systems. The viscosities of molten RE-Mg-Si-O-N glasses exponentially increased with nitrogen content. 29Si MAS-NMR spectra of RE-Mg-Si-O-N (RE=Y and La) glasses revealed that content of silicon-oxynitride species, like SiO 3N, increased with nitrogen content, which indicates that nitrogen clearly modifies the glass network structure. Depending on cationic radius of rare-earth elements, Y was found to be more effective in silicon-oxynitride species formation than La, which are consistent with the results of viscosity measurement of molten RE-Mg-Si-O-N glasses at elevated temperature (∼1873 K).

Original languageEnglish
Pages (from-to)69-72
Number of pages4
JournalKey Engineering Materials
Publication statusPublished - 2009


  • IGF
  • Molten oxynitride
  • Rare earth
  • Viscosity


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