Leach Rates and Thermal Properties of Lead-Iron Phosphate Glass Waste Forms

ABSTRACTA series of iron phosphate glass waste forms with compositions of 45Fe2O3-55P2O5, 20Fe2O3-80P2O5, and 20Fe2O3-20Na2O-60P2O5, namely FeP-1, FeP-2 and FeP-3, was studied by analytical electron microscopy (AEM). Transmission electron microscopy (TEM) bright-field (BF) imaging showed that under the electron irradiation, phase segregation occurred in both the FeP-1 and FeP-2 samples at high electron doses (3.84×1026 e/m2). In contrast, bubbles formed in the FeP-3 sample, even at a relatively low dose (2.88×1025 e/m2), which may be attributed to the migration of Na under irradiation as in the case in sodium borosilicate glass. Series electron energy-loss spectroscopy (EELS) analysis showed that the glass materials experienced mass-loss and composition variation. No obvious Fe valence state changes under irradiation were observed within the irradiation period.

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Iron phosphate glass waste forms for vitrifying Hanford AZ102 low activity waste (LAW), part I: Glass formation model

Journal of Non-Crystalline Solids ◽

10.1016/j.jnoncrysol.2016.11.019 ◽

2017 ◽

Vol 458 ◽

pp. 149-156 ◽

Cited By ~ 2

Author(s):

Chandra S. Ray ◽

V.A. Samaranayake ◽

Ali Mohammadkhah ◽

Thomas E. Day ◽

Delbert E. Day

Keyword(s):

Phosphate Glass ◽

Glass Formation ◽

Iron Phosphate ◽

Formation Model ◽

Glass Waste ◽

Waste Forms ◽

Low Activity

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Iron phosphate glass waste forms for vitrifying Hanford AZ102 Low Activity Waste (LAW), part II: Property-composition model

Journal of Non-Crystalline Solids ◽

10.1016/j.jnoncrysol.2018.05.007 ◽

2018 ◽

Vol 495 ◽

pp. 107-116 ◽

Cited By ~ 1

Author(s):

Chandra S. Ray ◽

V.A. Samaranayake ◽

Ali Mohammadkhah ◽

Thomas E. Day ◽

Delbert E. Day

Keyword(s):

Phosphate Glass ◽

Iron Phosphate ◽

Glass Waste ◽

Waste Forms ◽

Low Activity

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Leach Rates of Lead-Iron Phosphate Glass Waste Forms

Journal of Nuclear Science and Technology ◽

10.1080/18811248.1988.9735907 ◽

1988 ◽

Vol 25 (8) ◽

pp. 661-666 ◽

Cited By ~ 8

Author(s):

Tadashi YANAGI ◽

Makoto YOSHIZOE ◽

Naoki NAKATSUKA

Keyword(s):

Phosphate Glass ◽

Iron Phosphate ◽

Glass Waste ◽

Waste Forms

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Thermal properties of Na2O–P2O5–Fe2O3 polyphosphate glasses

Journal of Thermal Analysis and Calorimetry ◽

10.1007/s10973-020-09476-3 ◽

2020 ◽

Vol 142 (1) ◽

pp. 203-209 ◽

Cited By ~ 1

Author(s):

Paweł Goj ◽

Małgorzata Ciecińska ◽

Magdalena Szumera ◽

Paweł Stoch

Keyword(s):

Thermal Properties ◽

Phosphate Glass ◽

Transformation Temperature ◽

Glass Network ◽

Iron Phosphate ◽

Phosphate Glasses ◽

Continuous Change ◽

Glass Transformation ◽

Immobilization Techniques ◽

Iron Phosphate Glasses

Abstract Iron phosphate glasses are materials that can have many applications like durable matrixes in waste immobilization techniques, biomaterials, optoelectronic devices, etc. Their possible usage is related to their glass network and thermal properties. The influence of Na2O content on thermal properties and crystallization ability of iron phosphate glass of base composition 30 Fe2O3–70 P2O5 mol% were studied. Increasing the content of Na2O causes a decrease in transformation temperature and increase in ΔCp. Characteristic temperatures, thermal stability and crystallizing phases were determined. Increasing content of sodium causes depolarization of iron phosphate glass network which causes a continuous change in ΔCp and glass transformation temperature. Discontinuous change in some glass properties suggests structure rebuilding about 30 mol% of Na2O.

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