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

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2000

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Book of Abstracts.

ISBN

1-57498-116-1

ISSN

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e-ISSN

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Počet stran výsledku

8

Strana od-do

309-316

Název nakladatele

American Ceramic Society

Místo vydání

N/A

Místo konání akce

St. Louis, Missouri [US]

Datum konání akce

29. 4. 2000

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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