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 language | English |
|---|---|
| Pages (from-to) | 51-58 |
| Number of pages | 8 |
| Journal | Journal of Crystal Growth |
| Volume | 307 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2007 Sep 1 |
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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 journal › Article
}
TY - JOUR
T1 - Effect of atmosphere on the surface tension and viscosity of molten LiNbO3 measured using the surface laser-light scattering method
AU - Nagasaka, Yuji
AU - Kobayashi, Yusuke
PY - 2007/9/1
Y1 - 2007/9/1
N2 - 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.
AB - 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.
KW - A1. Ripplon surface laser-light scattering method
KW - A1. Surface tension
KW - A1. Thermophysical properties
KW - A1. Viscosity
KW - A2. Growth from melt
KW - B1. Lithium niobate
UR - http://www.scopus.com/inward/record.url?scp=34548127811&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34548127811&partnerID=8YFLogxK
U2 - 10.1016/j.jcrysgro.2007.01.050
DO - 10.1016/j.jcrysgro.2007.01.050
M3 - Article
VL - 307
SP - 51
EP - 58
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
SN - 0022-0248
IS - 1
ER -