Effect of atmosphere on the surface tension and viscosity of molten LiNbO3 measured using the surface laser-light scattering method

Yuji Nagasaka, Yusuke Kobayashi

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The surface tension and the viscosity of molten LiNbO3 (LN) having the congruent composition have been measured simultaneously in a temperature range from 1537 to 1756 K under argon gas and dry-air atmospheres. The present measurement technique involves surface laser-light scattering (SLLS) that detects nanometer-order-amplitude surface waves usually regarded as ripplons excited by thermal fluctuations. This technique's non-invasive nature allows it to avoid the experimental difficulties of conventional techniques resulting from the insertion of an actuator in the melt. The results of surface tension measurement obtained under a dry-air atmosphere are about 5% smaller than those obtained under an argon atmosphere near the melting temperature, and the temperature dependence of the surface tension under a dry-air atmosphere is twice that under an argon atmosphere. The uncertainty of surface tension measurement is estimated to be ±2.6% under argon and ±1.9% under dry air. The temperature dependence of viscosity can be well correlated with the results of Arrhenius-type equations without any anomalous behavior near the melting point. The viscosities obtained under a dry-air atmosphere were slightly smaller than those obtained under an argon atmosphere. The uncertainty of viscosity measurement is estimated to be ±11.1% for argon and ±14.3% for dry air. Moreover, we observed the real-time dynamic behavior of the surface tension and the viscosity of molten LN in response to argon and dry-air atmospheres.

Original languageEnglish
Pages (from-to)51-58
Number of pages8
JournalJournal of Crystal Growth
Volume307
Issue number1
DOIs
Publication statusPublished - 2007 Sep 1

Fingerprint

Argon
Light scattering
Surface tension
Molten materials
interfacial tension
light scattering
Viscosity
viscosity
atmospheres
argon
Lasers
Air
air
lasers
Melting point
Viscosity measurement
temperature dependence
lithium niobate
Surface waves
Temperature

Keywords

  • A1. Ripplon surface laser-light scattering method
  • A1. Surface tension
  • A1. Thermophysical properties
  • A1. Viscosity
  • A2. Growth from melt
  • B1. Lithium niobate

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Effect of atmosphere on the surface tension and viscosity of molten LiNbO3 measured using the surface laser-light scattering method. / Nagasaka, Yuji; Kobayashi, Yusuke.

In: Journal of Crystal Growth, Vol. 307, No. 1, 01.09.2007, p. 51-58.

Research output: Contribution to journalArticle

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