Viscosity of iron silicate melts with a variety of iron oxidation state in wide temperature range

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420792
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Metal making/Resorce production engineering
• Research Institution: Tohoku University
• Principal Investigator: Sukenaga Sohei 東北大学, 多元物質科学研究所, 助教 (20432859)
• Co-Investigator(Renkei-kenkyūsha): Kim Kyung-Ho 東北大学, 多元物質科学研究所, 教育支援者 (30733589)
• Research Collaborator: Daniel Neuville パリ地球物理学研究所, 教授
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: ケイ酸塩融体 / 粘度 / 鉄イオン

Outline of Final Research Achievements

Influence of iron oxidation state on viscosity of sodium iron silicate melts was evaluated by a rotating crucible method. Also, Glass transition temperature of glassy samples were determined by Differential Scanning Calorimetry (DSC). These results shows viscosity of the melts increases with an increase in trivalent iron ions (Fe3+) both at temperatures above liquids and close to glass transition. Raman spectra of the glass samples indicates that trivalent iron ions are in part coordinated by 4 oxygen atoms and those tetrahedron acts as a network former. Moreover, these FeO4 tetrahedron increased with increasing oxygen partial pressure in the atmosphere. The increase in viscosity with increasing concentration of Fe3+ will be caused by an increase in polymerization degree of network structure.

Free Research Field

融体物理化学