Effect of Oxidation State of Iron Ions on the Viscosity of Silicate Melts
Viscosity of R2O-SiO2-FexO (R=Li, Na or K) melts was measured by a rotating cylinder type viscometer with a gas-tight furnace. The measurements were carried out as a function of systematically changing oxygen partial pressure controlled by Ar-based gases at 1773 K. In addition, the samples were molten under each of the atmospheres at 1773 K for 4.5 h and then quenched on a cupper plate. These quenched vitreous samples were chemically analyzed for quantifying oxidation state of iron ions. The ratio of Fe2+ to Fe3+ in the glasses decreased with increasing the oxygen partial pressure in all the samples. In parallel, the viscosity of the melts decreased with increasing the ratio of Fe2+ to Fe3+. The data indicates that the increase of Fe2+ ion that behaves as a network modifier, would result in depolymerisation of the silicate anions. It should be also noted that the viscosity of the melts was decreased in the order of alkali cationic radius (K > Na > Li) when the ratio of Fe2+ to Fe3+ in the melts was comparable; it would be due to the change in the coordination structure of Fe3+ in these melts.
viscosity silicate melts iron oxides oxygen partial pressure
Sohei SUKENAGA Takeshi OHSUGI Yosuke INATOMI Yoshiaki GONDA Takashi WATANABE Noritaka SAITO Kunihiko NAKASHIMA
Department of Materials Science and Engineering, Kyushu University, 8190395, Japan CEMHTI CNRS, Orlé Department of Decommissioning and Waste Management Nuclear Science Research Institute, Tokai Researc Department of Materials Science and Engineering, Kyushu University, 8190395, Japan Department of Chemistry and Materials Science, Tokyo Institute of Technology, 1528550, Japan
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-9
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）