Effect of RE 2O 3 (RE = Y, Gd, Nd and La) additions on liquidas temperatures and viscosities of MgrO-SiO 2 melts

Noritaka Saito, Daiji Nakata, Ayumu Umemoto, Kunihiko Nakashima

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The effect of adding RE 2O 3 (RE = Y, Gd, Nd and La) on the liquidus temperature of 45.2MgO54.8SiO 2 (mol%) system has been measured by the hot-thermocouple method. Moreover, The effect of adding RE 2O 3 (RE = Y, Gd, Nd and La) on the viscosity of 45.2MgO-54.8SiO 2 (mol%) melt has been measured with a rotating crucible viscometer. In addition, structural characterization of the quench vitreous samples was investigated by using IR spectra. Liquidus temperature and viscosity decreased with increasing of RE 2O 3 content, 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. These results indicate that RE 2O 3 behaves as a network modifier in RE 2O 3- (45.2MgO-54.8SiO 2) melts. It is very likely that the RE 2O 3 with the larger ionic radius will modify the silicate networks more strongly. The IR spectra indicated that the degree of polymerization of silicate anions in RE 2O 3-(45.2MgO-54.8SiO 2) melts decreased with increasing RE 2O 3 content.

Original languageEnglish
Pages (from-to)152-158
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume69
Issue number1
DOIs
Publication statusPublished - Jan 1 2005

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Silicates
liquidus
Viscosity
viscosity
radii
Viscometers
silicates
Crucibles
Thermocouples
Rare earth elements
Anions
viscometers
Negative ions
Polymerization
crucibles
thermocouples
Temperature
temperature
rare earth elements
polymerization

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Effect of RE 2O 3 (RE = Y, Gd, Nd and La) additions on liquidas temperatures and viscosities of MgrO-SiO 2 melts",
abstract = "The effect of adding RE 2O 3 (RE = Y, Gd, Nd and La) on the liquidus temperature of 45.2MgO54.8SiO 2 (mol{\%}) system has been measured by the hot-thermocouple method. Moreover, The effect of adding RE 2O 3 (RE = Y, Gd, Nd and La) on the viscosity of 45.2MgO-54.8SiO 2 (mol{\%}) melt has been measured with a rotating crucible viscometer. In addition, structural characterization of the quench vitreous samples was investigated by using IR spectra. Liquidus temperature and viscosity decreased with increasing of RE 2O 3 content, 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. These results indicate that RE 2O 3 behaves as a network modifier in RE 2O 3- (45.2MgO-54.8SiO 2) melts. It is very likely that the RE 2O 3 with the larger ionic radius will modify the silicate networks more strongly. The IR spectra indicated that the degree of polymerization of silicate anions in RE 2O 3-(45.2MgO-54.8SiO 2) melts decreased with increasing RE 2O 3 content.",
author = "Noritaka Saito and Daiji Nakata and Ayumu Umemoto and Kunihiko Nakashima",
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T1 - Effect of RE 2O 3 (RE = Y, Gd, Nd and La) additions on liquidas temperatures and viscosities of MgrO-SiO 2 melts

AU - Saito, Noritaka

AU - Nakata, Daiji

AU - Umemoto, Ayumu

AU - Nakashima, Kunihiko

PY - 2005/1/1

Y1 - 2005/1/1

N2 - The effect of adding RE 2O 3 (RE = Y, Gd, Nd and La) on the liquidus temperature of 45.2MgO54.8SiO 2 (mol%) system has been measured by the hot-thermocouple method. Moreover, The effect of adding RE 2O 3 (RE = Y, Gd, Nd and La) on the viscosity of 45.2MgO-54.8SiO 2 (mol%) melt has been measured with a rotating crucible viscometer. In addition, structural characterization of the quench vitreous samples was investigated by using IR spectra. Liquidus temperature and viscosity decreased with increasing of RE 2O 3 content, 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. These results indicate that RE 2O 3 behaves as a network modifier in RE 2O 3- (45.2MgO-54.8SiO 2) melts. It is very likely that the RE 2O 3 with the larger ionic radius will modify the silicate networks more strongly. The IR spectra indicated that the degree of polymerization of silicate anions in RE 2O 3-(45.2MgO-54.8SiO 2) melts decreased with increasing RE 2O 3 content.

AB - The effect of adding RE 2O 3 (RE = Y, Gd, Nd and La) on the liquidus temperature of 45.2MgO54.8SiO 2 (mol%) system has been measured by the hot-thermocouple method. Moreover, The effect of adding RE 2O 3 (RE = Y, Gd, Nd and La) on the viscosity of 45.2MgO-54.8SiO 2 (mol%) melt has been measured with a rotating crucible viscometer. In addition, structural characterization of the quench vitreous samples was investigated by using IR spectra. Liquidus temperature and viscosity decreased with increasing of RE 2O 3 content, 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. These results indicate that RE 2O 3 behaves as a network modifier in RE 2O 3- (45.2MgO-54.8SiO 2) melts. It is very likely that the RE 2O 3 with the larger ionic radius will modify the silicate networks more strongly. The IR spectra indicated that the degree of polymerization of silicate anions in RE 2O 3-(45.2MgO-54.8SiO 2) melts decreased with increasing RE 2O 3 content.

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