Actinide immobilization in crystalline matrix: a study of uranium incorporation in gadolinium zirconate

Kutty, K.V. Govindan; Asuvathraman, R.; Madhavan, R.; Jena, Hrudananda

doi:10.1016/j.jpcs.2004.06.066

Cited by 55 publications

(15 citation statements)

References 15 publications

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“…It was found that only Zr 3d 5/2 peaks, at 181.8 eV and 184.2 eV (Figure A, D, and E), were observed in the Gd‐Zr‐O film. This represents the active energy spectrum for oxidic‐bonded Zr, which is consistent with Kutty's report . This implies that Gd 2 Zr 2 O 7 pyrochlore structure forms at 725°C, for 0.8 M solution, and at 325°C, for 0.2 M solution.…”

Section: Resultssupporting

confidence: 89%

Surface engineering of the flexible metallic substrate by SDP‐Gd‐Zr‐O layer for IBAD‐MgO templates

Chu

Zhao

Jiang³

et al. 2018

J Am Ceram Soc

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Tuning substrate properties is an effective methodology to modulate the texture development of MgO films deposited by ion beam-assisted deposition (IBAD) process for epitaxial oxide films. Herein, a solution deposition planarization (SDP) technique is employed to deposit Gd-Zr-O layer for engineering surface properties of the flexible metal substrate. The correlation between the Gd-Zr-O thin film microstructure and the IBAD-MgO texture is investigated. The coordinated study on atomic force microscopy (AFM) and reflection high-energy electron diffraction (RHEED) reveal that the grain coarsening during high-temperature sintering negatively influences the texture formation of IBAD-MgO. Moreover, the chemical environment of the atoms on the surface of Gd-Zr-O seed layer also plays a critical role, which is normally overlooked. The X-ray photoelectron spectroscopy (XPS) analysis indicates that the carbon residue and intermediate phase result in the poor texture of the IBAD-MgO. This phenomenon is related to the partial decomposition and synthesis reactions due to the lower sintering temperature or reduced surface to volume ratio. We demonstrate the high-quality texture of IBAD-MgO layer, deposited on mono-coated thick Gd-Zr-O film, by using optimal heat-treatment conditions. The cross-sectional TEM images present the dense Gd-Zr-O film with Gd 2 Zr 2 O 7 nanograins. The multifunctionalities, such as planarization, a barrier layer, and seed layer, of Gd-Zr-O layers are realized in full-stacked CeO 2 /LaMnO 3 /IBAD-MgO/SDP-Gd-Zr-O/C276 samples. This work demonstrates a route for simplifying the architecture of 2G-HTS using Gd-Zr-O layer and explores the effect of the surface properties on texture formation in IBAD-MgO layer. K E Y W O R D S chemical environment of the atoms, coated conductors, Gd-Zr-O amorphous films, ion beam-assisted deposition, solution deposition planarization, surface roughness

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Section: Resultssupporting

confidence: 89%

Surface engineering of the flexible metallic substrate by SDP‐Gd‐Zr‐O layer for IBAD‐MgO templates

Chu

Zhao

Jiang³

et al. 2018

J Am Ceram Soc

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“…Currently, glass-ceramics with various crystalline structures have been investigated for the immobilization of high-level wastes (HLWs), including perovskite [15], pyrochlore [16][17][18][19][20][21][22], zirconolite [14,[23][24] and brannerite [18,19,25]. Among these, the pyrochlore structure offers a wide range of possibilities for the immobilization of actinide nuclides due to the flexibility of the A 2 B 2 O 7 structure, in which A, B and O are 8-, 6-and 4-coordinated cation sites, respectively [9,[26][27][28][29]. Additionally, reports on radiation damage have revealed that the chemical stability of the pyrochlore structure is sustained even in the completely amorphous states [30,31].…”

Section: Introductionmentioning

confidence: 99%

Rapid solidification synthesis of novel (La,Y)2(Zr,Ti)2O7 pyrochlore-based glass-ceramics for the immobilization of high-level wastes

Guo

Zhang

Allix

et al. 2021

Journal of the European Ceramic Society

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“…Pyrochlore‐structured materials (with general formula A 2 B 2 X 6 Y, in which A and B are 8‐ and 6‐coordinated cation sites, and X and Y are 4‐coordinated anion sites) have long been recognized as suitable host phases for incorporating a wide range of cations including minor actinides 30‐34 . Among them, titanate pyrochlores (A 2 Ti 2 O 7 ) have been extensively studied 35‐38 .…”

Section: Introductionmentioning

confidence: 99%

Pyrochlore glass‐ceramics fabricated via both sintering and hot isostatic pressing for minor actinide immobilization

Zhang

Wei

et al. 2020

J Am Ceram Soc

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Pyrochlore glass‐ceramics (GCs) have been investigated with samples fabricated via both sintering and hot isostatic pressing (HIPing) of a mixed oxide precursor. It has been demonstrated that sintering at 1200°C in air is necessary to obtain well‐crystallized pyrochlore crystals in a sodium aluminoborosilicate glass through a one‐step controlled cooling. The crystallization, structure, and microstructure of Eu2Ti2O7 pyrochlore as the major phases in residual glass were confirmed with X‐ray diffraction (XRD), scanning electron microscopy‐energy dispersive spectroscopy, transmission electron microscopy, and Raman spectroscopy. The structures of major Eu2Ti2O7 pyrochlore and minor [Eu4.67O(SiO4)3] apatite in both sintered and HIPed samples were refined using synchrotron XRD data. While the processing atmosphere did not appear to affect the cell parameter of the main pyrochlore phase, very small volume expansion (~0.3%) was observed for the minor apatite phase in the HIPed sample. In addition, static leaching of the HIPed sample confirmed that pyrochlore GCs are chemically durable. Overall, pyrochlore GCs prepared via both sintering and HIPing with the Eu partitioning factor of ~23 between ceramics and the residual glass are suitable waste forms for minor actinides with processing chemicals.

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Actinide immobilization in crystalline matrix: a study of uranium incorporation in gadolinium zirconate

Cited by 55 publications

References 15 publications

Surface engineering of the flexible metallic substrate by SDP‐Gd‐Zr‐O layer for IBAD‐MgO templates

Surface engineering of the flexible metallic substrate by SDP‐Gd‐Zr‐O layer for IBAD‐MgO templates

Rapid solidification synthesis of novel (La,Y)2(Zr,Ti)2O7 pyrochlore-based glass-ceramics for the immobilization of high-level wastes

Pyrochlore glass‐ceramics fabricated via both sintering and hot isostatic pressing for minor actinide immobilization

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