The Effect of Oxygen Partial Pressure on Liquidus Temperature of a High-Level Waste Glass with Spinel as the Primary Phase.

Result code in IS VaVaI
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Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
The Effect of Oxygen Partial Pressure on Liquidus Temperature of a High-Level Waste Glass with Spinel as the Primary Phase.
Original language description
The redox state of iron affects spinel crystallization in vitrified high-level waste (HLW) glass1. Simulated HLW glass with spinel primary crystalline phase was heat treated at constant temperatures within the interval from 850 C to 1300 C under varyingatmospheres with oxygen partial pressure, pO2, ranging from 1x10-17kPa (pure CO) to 101.325 kPa (pure O2). Liquidus temperature (TL) of glass increased with decreasing pO2 at pO2 > 10-9kPa. At pO2 < 10-9kPa, Alloy of Ni and Fe precipitated from glass, and TL decreased. Samples were analyzed with optical microscope and scanning electron microscope. Mass fraction of spinel in glass was determined using X-ray diffraction and spinel composition was investigated with energy disperse spectroscopy. Ferrous/ferric equilibrium at TL was calculated in HLW glass as a function temperature, and pO2 based on thermodynamic equations. Temperature coefficient of FeO (TL(FeO) = 5027 C) was estimated from calculated ferrous/ferric equilibrium at TL.
Czech name
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Czech description
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Publication year
2000
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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