TY - JOUR
T1 - Influence of oxygen partial pressure on surface tension of molten silver
AU - Ozawa, S.
AU - Morohoshi, K.
AU - Hibiya, T.
AU - Fukuyama, H.
N1 - Funding Information:
This work was financially supported by SENTAN, Japan Science and Technology Agency (JST). One of the authors (S.O.), acknowledges support of the Sasakawa Scientific Research Grant from The Japan Science Society. We would like to thank Dr. Shirakawa (Advanced Industrial Science and Technology: AIST) and Mr. Nagasawa (Canon Machinery Inc.) for giving us the chance to use the high performance oxygen pump ROX-530. The authors would like to thank Professor Tsukada (Tohoku University, Japan) and Professor Watanabe (Gakushuin University, Japan) for their helpful discussions. One of authors (T.H.), wishes to thank the Keio University GCOE program for “Symbiotic, safe and secure System Design” for financial support.
PY - 2010
Y1 - 2010
N2 - Influences of oxygen partial pressure, PO2, of ambient atmosphere and temperature on surface tension of molten silver were experimentally investigated by an oscillating droplet method using an electromagnetic levitation furnace. We successfully measured surface tension of molten silver within a very wide temperature range of over 550 K under a well-controlled PO2 atmosphere. Surface tension of pure melt surface, σp, was determined without any contamination such as oxygen adsorption and the reaction between the melt and a measurement device at a PO2 of less than 10-12 Pa. When the PO2 was controlled at 102 Pa, the "boomerang shape" temperature dependence of surface tension was experimentally observed; surface tension was increased and then decreased with increasing temperature. From these experimental data, the temperature dependence of equilibrium constant for oxygen adsorption was determined using the Szyszkowski equation. We successfully expressed the surface tension of molten silver as functions of both PO 2 and temperature. Furthermore, the changes in enthalpy and entropy for oxygen adsorption on molten silver were also estimated.
AB - Influences of oxygen partial pressure, PO2, of ambient atmosphere and temperature on surface tension of molten silver were experimentally investigated by an oscillating droplet method using an electromagnetic levitation furnace. We successfully measured surface tension of molten silver within a very wide temperature range of over 550 K under a well-controlled PO2 atmosphere. Surface tension of pure melt surface, σp, was determined without any contamination such as oxygen adsorption and the reaction between the melt and a measurement device at a PO2 of less than 10-12 Pa. When the PO2 was controlled at 102 Pa, the "boomerang shape" temperature dependence of surface tension was experimentally observed; surface tension was increased and then decreased with increasing temperature. From these experimental data, the temperature dependence of equilibrium constant for oxygen adsorption was determined using the Szyszkowski equation. We successfully expressed the surface tension of molten silver as functions of both PO 2 and temperature. Furthermore, the changes in enthalpy and entropy for oxygen adsorption on molten silver were also estimated.
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U2 - 10.1063/1.3275047
DO - 10.1063/1.3275047
M3 - Article
AN - SCOPUS:75649119641
VL - 107
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 1
M1 - 014910
ER -