Viscosity and refractive index of M2O-TeO2(M = Li, Na and K) melts

Hirofumi Tokunaga, Shinichiro Haruki, Sohei Sukenaga, Noritaka Saito, Kunihiko Nakashima

Research output: Contribution to journalArticle

Abstract

We measured the viscosity and the refractive index of the binary tellurite glasses and melts, (M2O-TeO2 M = Li, Na and K), and investigated the thermal and compositional dependences of the properties. It was found that the viscosity and the refractive index of the binary tellurite melts decreased with increasing temperature, M2O content, and the radius of added cation. It was attributed to the structural change of melt from TeO4 trigonal bipyramid to TeO4- trigonal bipyramid and TeO3 trigonal pyramid with increasing temperature and M2O content. In an attempt to determine the change of tellurite structural units (TeO4, TeO4- and TeO3) with temperature and M2O content, the fraction of structural units in the melts was calculated from the refractive index of melts on the basis of the relationship between the refractive index and the structural units of tellurite glasses. It was found that the fraction of TeO3 increased with increasing temperature and M2O content, which was corresponded to the thermal and compositional dependences of the viscosity and refractive index measurements.

Original languageEnglish
Pages (from-to)331-336
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume74
Issue number5
DOIs
Publication statusPublished - 2010 May 1
Externally publishedYes

Keywords

  • Glass melt
  • Refractive index
  • Tellurite
  • Viscosity

ASJC Scopus subject areas

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

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