Iron redox effect on the structure and viscosity of silicate glasses and melts - Archive ouverte HAL
Article Dans Une Revue The Journal of Chemical Physics Année : 2024

Iron redox effect on the structure and viscosity of silicate glasses and melts

Sohei Sukenaga
Hiroki Yamada
Toru Wakihara
  • Fonction : Auteur
Koji Ohara
Daniel Neuville

Résumé

The viscosity of silicate melts is one of the most important physical properties for understanding high-temperature phenomena in magmatic systems as well as materials processing. The effects of composition and temperature on viscosity have long been elucidated. Although iron ions are a main component of the magmatic system, their influence on viscosity remains unclear because the behavior of iron is complicated; iron ions have two redox states, that is, Fe 3+ and Fe 2+ . Here, we elucidate the viscosity of an iron-sodium-silicate system with a variety of iron redox states at temperatures close to its glass transition (T g ). The redox states and structures of the samples were characterized using X-ray absorption near-edge structure (XANES) spectroscopy, Raman spectroscopy, synchrotron X-ray total scattering, and density (molar volume) measurements. The viscosity increased (by more than two orders of magnitude) with an increase in the ratio of Fe 3+ to total Fe (Fe 3+ /Fe tot ) whereas the temperature dependence of the viscosity was larger for glasses with a higher Fe 3+ /Fe tot ratio. The tendencies in viscosity and structural variation against the Fe 3+ /Fe tot ratio support the consensus on the structural roles of Fe 3+ and Fe 2+ from previous studies: Fe 3+ ions have a stronger tendency to behave as a network former than Fe 2+ ions.

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Dates et versions

hal-04855948 , version 1 (26-12-2024)

Identifiants

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Sohei Sukenaga, Maria Rita Cicconi, Hiroki Yamada, Toru Wakihara, Koji Ohara, et al.. Iron redox effect on the structure and viscosity of silicate glasses and melts. The Journal of Chemical Physics, 2024, 161 (24), ⟨10.1063/5.0243427⟩. ⟨hal-04855948⟩
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