Investigation of Ce incorporation in zirconolite glass-ceramics for UK plutonium disposition

MRS Advances ◽  
2017 ◽  
Vol 2 (13) ◽  
pp. 699-704 ◽  
Author(s):  
Stephanie M. Thornber ◽  
Martin C. Stennett ◽  
Neil C. Hyatt
Keyword(s):  
Glass Ceramic ◽  
Perovskite Phase ◽  
Hot Isostatic Pressing ◽  
Glass Ceramics ◽  
Ceramic Phase ◽  
Isostatic Pressing ◽  
Preliminary Work

ABSTRACTCerium incorporation in zirconolite glass-ceramic systems, consolidated by hot isostatic pressing, was investigated. Samples were formulated to target Ce incorporation on the Ca and / or Zr sites. Results show successful incorporation of Ce into the ceramic phase although complete waste digestion was not achieved. The formation of a Ce-bearing perovskite phase when targeting Zr substitution, was associated with reduction of Ce4+to Ce3+. This study is part of preliminary work towards fabricating Pu-bearing glass-ceramic HIP samples.

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

2020 ◽  
Vol 103 (10) ◽  
pp. 5470-5479
Author(s):  
Yingjie Zhang ◽  
Zhaoming Zhang ◽  
Tao Wei ◽  
Linggen Kong ◽  
Young J. Kim ◽  
...  
Keyword(s):  
Hot Isostatic Pressing ◽  
Glass Ceramics ◽  
Minor Actinide ◽  
Isostatic Pressing

Experimental Glass-Ceramic Products to Immobilize ICPP HLW

1987 ◽  
Vol 112 ◽  
Author(s):  
Roseanne S. Baker ◽  
Bruce A. Staples ◽  
Dieter A. Knecht ◽  
Julius R. Berreth
Keyword(s):  
Glass Ceramic ◽  
Hot Isostatic Pressing ◽  
Glass Ceramics ◽  
High Level Waste ◽  
Processing Plant ◽  
Chemical Processing ◽  
Stabilized Zirconia ◽  
Experimental Glass ◽  
Ceramic Glass ◽  
High Level

AbstractCandidate products are being evaluated to immobilize the routinely calcined waste at the Idaho Chemical Processing Plant (ICPP). A potential product with minimal volume for immobilizing ICPP high-level waste (HLW) for final disposal is a high-waste-loading and high-density glass-ceramic. Glass-ceramics are formed by Hot Isostatic Pressing (HIPing) the HLW with selected additives, such as SiO2, B2O3, Li2O, Na2O, and Y2O3. Glass-ceramic products have been formed with calcine loa ings up to 80 wt% and densities up to 3.4 g/cm3. Crystalline phases observed in the glass-ceramic products include calcium fluoride, monoclinic and cubic zirconia, calcium- and yttrium-stabilized zirconia, and zircon. An interstitial amorphous phase also exists consisting of the oxides of silicon, aluminum, boron, and alkalis. The glass-ceramic waste forms give leach rates comparable to simulated HLW glass products.

Stainless steel/glass–ceramic interactions under hot isostatic pressing (HIPing) conditions

2008 ◽  
Vol 375 (3) ◽  
pp. 315-322 ◽  
Author(s):  
Y. Zhang ◽  
H. Li ◽  
P.J. McGlinn ◽  
B. Yang ◽  
B.D. Begg
Keyword(s):  
Stainless Steel ◽  
Glass Ceramic ◽  
Hot Isostatic Pressing ◽  
Isostatic Pressing

Investigation of Processing Parameters for the Consolidation of Actinide Glass-Ceramic Wasteforms by Hot Isostatic Pressing

MRS Advances ◽  
2016 ◽  
Vol 1 (63-64) ◽  
pp. 4269-4274 ◽  
Author(s):  
Stephanie Thornber ◽  
Paul Heath ◽  
Ewan Maddrell ◽  
Martin C. Stennett ◽  
Neil C. Hyatt
Keyword(s):  
Sample Preparation ◽  
Hot Isostatic Pressing ◽  
Glass Ceramics ◽  
Processing Parameters ◽  
Isostatic Pressing ◽  
Al Content ◽  
High Temperature Heat Treatment ◽  
Nuclear Decommissioning ◽  
Optimum Formulation ◽  
The Uk

ABSTRACTGlass-ceramics were developed initially for the immobilization of miscellaneous Pu-residues at the UK’s Sellafield site from which it was uneconomic to recover Pu for reuse. Renewed interest in the immobilization of a portion of the UK PuO2 stockpile has led to glass-ceramics being evaluated for bulk Pu immobilization. The Nuclear Decommissioning Authority (NDA) in the UK have proposed hot isostatic pressing (HIP) as a potential consolidation technique for the processing of these wasteforms. In this study, zirconolite based glass-ceramics were investigated to determine an optimum formulation. The yield of zirconolite is shown to vary with glass composition and glass fraction, such that a higher Al content favours zirconolite formation. The sample preparation process is discussed to highlight the importance of a high temperature heat-treatment during sample preparation to achieve high quality HIPed wasteforms.

scholarly journals Dielectric Properties of La2O3 Doped Composite (PbxSr1−x)TiO3 Borosilicate Glass Ceramic

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
C. R. Gautam ◽  
Devendra Kumar ◽  
Om Parkash ◽  
O. P. Thakur
Keyword(s):  
Dielectric Constant ◽  
Glass Ceramic ◽  
Perovskite Phase ◽  
Glass Ceramics ◽  
Dielectric Behavior ◽  
Effective Dielectric Constant ◽  
Glassy Matrix ◽  
Crystal Glass ◽  
Treatment Schedule ◽  
Ceramic Samples

Ferroelectric (PbxSr1−x)TiO3 (PST) perovskite phase has been crystallized in borosilicate glassy matrix with a suitable choice of composition and heat treatment schedule. La2O3 is a donor dopant for PST and can make it semiconducting. Dispersion of semiconducting perovskite phase in insulating glassy matrix in glass-ceramic samples may lead to the formation of space charge polarization around crystal-glass interface, leading to a high value of effective dielectric constant, εr. Therefore, with the aim of the developing glass ceramics with high dielectric constant, glasses in the system 64[(PbxSr1−x)O·TiO2]-25[2SiO2·B2O3]-5[K2O]-5[BaO]-1[La2O3] have been prepared (0.5≤x≤1). It is found that the addition of La2O3 strongly affected the crystallization and dielectric behavior of glass-ceramic with PST perovskite phase. All glass ceramic samples show a diffuse broad Curie peak in their εr versus T plots. Curie peak temperature, Tc, depends on compositions of the glass-ceramic samples as well as frequency of measurements.

scholarly journals Crystallization Behavior and Microstructural Analysis of Lead-Rich () Glass Ceramics Containing 1 mole

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
C. R. Gautam ◽  
Devendra Kumar ◽  
Om Parkash
Keyword(s):  
Transition Metal Oxides ◽  
Glass Ceramic ◽  
Crystallization Behavior ◽  
Perovskite Phase ◽  
Microstructural Analysis ◽  
Glass Ceramics ◽  
Glassy Matrix ◽  
X Ray Diffraction ◽  
X Ray ◽  
Higher Temperature

Solid solution of perovskite Pb,SrTiO3in Pb-rich composition can be crystallized in borosilicate glassy matrix. The addition of rare earth and transition metal oxides is known to influence the crystallization behavior and surface morphology of perovskite crystallites in glassy matrix. In the present paper, the glasses in the lead-rich system 64[(PbxSr1-x)·TiO3]-25[2SiO2·B2O3]-5[K2O]-5[BaO] () with the addition of 1 mol % La2O3were prepared to study its effect on their crystallization behavior. Differential thermal analysis (DTA) patterns show one or more exothermic crystallization sharp peaks, which shift towards higher temperature with increasing concentration of SrO. The glasses were subjected to various heat-treatment schedules for crystallization. X-ray diffraction analysis of these glass ceramic samples shows that major crystalline phase of the entire glass ceramic sample with was found to have tetragonal structure similar to PbTiO3ceramic, and addition of La2O3enhances the crystallization of the perovskite phase and retards the crystallization of minor phases.

scholarly journals The effect of pre-treatment parameters on the quality of glass-ceramic wasteforms for plutonium immobilisation, consolidated by hot isostatic pressing

2017 ◽  
Vol 485 ◽  
pp. 253-261 ◽  
Author(s):  
Stephanie M. Thornber ◽  
Paul G. Heath ◽  
Gabriel P. Da Costa ◽  
Martin C. Stennett ◽  
Neil C. Hyatt
Keyword(s):  
Glass Ceramic ◽  
Hot Isostatic Pressing ◽  
Isostatic Pressing ◽  
Pre Treatment

Synthesis and Characterization of Eu3+ Doped CaO-Nb2O5-SiO2 Glass-Ceramics

2014 ◽  
Vol 1030-1032 ◽  
pp. 185-188
Author(s):  
Qiong Song ◽  
Hong Bo Zhang ◽  
Xiao Wei Zhu ◽  
Chun Hui Su
Keyword(s):  
Heat Treatment ◽  
Glass Ceramic ◽  
Treatment Time ◽  
Glass Ceramics ◽  
Emission Peak ◽  
Infrared Light ◽  
Luminescence Spectra ◽  
Excitation Wavelength ◽  
Two Stage ◽  
Ceramic Phase

The glass-ceramics containing nanocrystalline CaNb2O6phase in the 35%SiO2-25%Nb2O5-20%CaO-15BaO-5%Eu2O3(wt%) glass system were prepared by the melt-quench technique followed by a two-stage controlled heat treatment. Samples were characterized by differential thermal analysis, X-ray diffraction, scanning electron microscope, spectrophotometer and fluorescence spectrophotometer. The results shown that glass ceramic phase is CaNb2O6, grain size is about 30 nm, The two-stage controlled heat treatment is beneficial to control of the number and size of grains, thus affecting the transparency of glass ceramic and luminescence properties. The transmittance of the glass ceramics can be up to 80% in the near-infrared light area. The luminescence spectra of Eu3+-doped glass and glass–ceramics were recorded at 394 nm excitation wavelength and the luminescence intensity is found to be increased with heat-treatment time due to increase in crystallinity. Fluorescence spectrum showed 4 emission peak, which located in the 578 nm (5D0-7F0), 592 nm (5D0-7F1), 615 nm (5D0-7F2) and 654 nm (5D0-7F3), Eu3 +emission peak intensity in the glass ceramic sample were greater than the substrate glass.

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