Iron phosphate glasses: Bulk properties and atomic scale structure

Joseph, Kuruvilla; Stennett, Martin C.; Hyatt, Neil C.; Asuvathraman, R.; Dube, Charu Lata; Gandy, Amy S.; Kutty, K.V. Govindan; Jolley, Kenny; Rao, P. R. Vasudeva; Smith, Roger

doi:10.1016/j.jnucmat.2017.07.015

Cited by 28 publications

(12 citation statements)

References 44 publications

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“…The energy of E 0 (7133 eV) for the Fe XANES spectra is evidence of the Fe(III) oxidation state, as shown when compared with the standard NaFeSi 2 O 6 . This is supported by analysis of the pre-edge feature, centred at 7114 eV, which corresponds to previous assignments of Fe(III) compounds at an average position of 7113.1 ± 0.2 eV, in addition to the reference compounds used here [42]. While an absolute assignment for the compound cannot usually be made from XANES, the energies and spectral features correspond well with the literature, particularly hematite (Fe 2 O 3 ) and C 6 Fe 2 O 12 [43,44].…”

Section: Fe Impuritysupporting

confidence: 89%

Nuclear forensic signatures and structural analysis of uranyl oxalate, its products of thermal decomposition and Fe impurity dopant

Thompson

Stennett

Gilbert

et al. 2021

J Radioanal Nucl Chem

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Uranyl oxalate (UO2C2O4·xH2O) may exist at the back-end of the nuclear fuel cycle (NFC) as an intermediate in spent fuel reprocessing. The conditions used in aqueous reprocessing and thermal treatment can affect the physical and chemical properties of the material. Furthermore, trace impurities, such as Fe, may incorporate into the structure of these materials. In nuclear forensics, understanding relationships between processing variables aids in determination of provenance and processing history. In this study, the thermal decomposition of UO2C2O4·3H2O and phase analysis of its thermal products are examined. Their morphologies are discussed with respect to a matrix of solution processing conditions.

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Section: Fe Impuritysupporting

confidence: 89%

Nuclear forensic signatures and structural analysis of uranyl oxalate, its products of thermal decomposition and Fe impurity dopant

Thompson

Stennett

Gilbert

et al. 2021

J Radioanal Nucl Chem

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“…Given the desirable chemical durability properties of iron phosphate glasses [Joseph et al, 2017], a number of studies have looked at crystallization from this base glass type, sometimes including B 2 O 3 or TiO 2 to suppress unwanted crystalline phases like ZrP 2 O 7 or FePO 4 [Asuvathraman et al, 2015, Deng et al, 2018, Wang et al, 2016. The main phase produced is monazite, which ends up as a mixed phase such as (Ce,La,Nd)PO 4 depending on the lanthanides added [Deng et al, 2018, Wang et al, 2016.…”

Section: Phosphatesmentioning

confidence: 99%

Vitrification of wastes: from unwanted to controlled crystallization, a review

McCloy¹,

Schuller²

2022

Comptes Rendus. Géoscience

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In this review, we provide a perspective on the science and technology of vitrification of waste. First, we provide a background on the general classes of wastes for which vitrification is currently used for immobilization or is proposed, including nuclear and industrial hazardous wastes. Next, we summarize the issues surrounding solubility of waste ions and resulting uncontrolled crystallization or phase separation. Some newer waste form designs propose a controlled crystallization, resulting in a glass-ceramic. A summary of glass systems and glass-ceramic systems is given, with the focus on immobilizing waste components at high waste loading. Throughout, design and processing considerations are given, and the difference between uncontrolled undesirable and controlled desirable crystallization is offered.

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“…Additionally, the relatively low viscosity of the melt results in a decrease in homogenization time, which limits the evaporation of volatile components. Thus, the secondary waste from off-gas systems and costs of the process are limited [ 4 , 5 , 6 , 7 ]. The presence of P-O-Fe bonds in IPG structure guarantee improved chemical durability compared to pure phosphate glasses, which makes IPG a good candidate for HLW vitrification, providing long-term environmental protection [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

An Insight into the Correlation between Chemical Composition Changes of Aluminum-Iron-Polyphosphate Glasses and Thermal Properties

et al. 2021

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The present study aimed to investigate the influence of the gradual substitution of Fe2O3 by Al2O3 on the thermal properties of polyphosphate glasses. The conducted considerations based on differential scanning calorimetry (DSC) and heating microscopy thermal analysis provided much essential information about the correlation between glass chemical composition and its characteristic parameters, such as transformation temperature, specific heat, crystallization temperature, crystallization enthalpy, the activation energy of crystal growth, melting temperature, and Angell glass thermal stability. The obtained estimation of viscosity changes as a function of temperature could be very helpful for researchers to correctly plan the vitrification process and thus radioactive waste immobilization. A precise analysis of DSC curves and X-ray diffraction patterns revealed the possibility of crystallization process design in order to create materials with different levels of crystallinity and phase composition. The drawn conclusions allow choosing the glass with the optimal concentration of Al2O3 and Fe2O3, which ensures the relatively low melting temperature, viscosity, and glass crystallization ability, with application potential in nuclear waste immobilization.

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Iron phosphate glasses: Bulk properties and atomic scale structure

Cited by 28 publications

References 44 publications

Nuclear forensic signatures and structural analysis of uranyl oxalate, its products of thermal decomposition and Fe impurity dopant

Nuclear forensic signatures and structural analysis of uranyl oxalate, its products of thermal decomposition and Fe impurity dopant

Vitrification of wastes: from unwanted to controlled crystallization, a review

An Insight into the Correlation between Chemical Composition Changes of Aluminum-Iron-Polyphosphate Glasses and Thermal Properties

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