Eutectic crystallization in the UO2–Al2O3–HfO2 ceramic phase diagram

Plevacova, K.; Journeau, Christophe; Piluso, Pascal; Poirier, Jacques

doi:10.1016/j.ceramint.2013.08.047

Cited by 13 publications

(6 citation statements)

References 9 publications

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“…The reassessed phase diagrams of La 2 O 3 –Al 2 O 3 and HfO 2 –Al 2 O 3 systems are shown in Figs. and compared with the experimental data, and the invariant reactions are presented in Table . The calculated results are in good agreement with most experimental data.…”

Section: Resultsmentioning

confidence: 99%

“…Because the source of thermodynamic data of oxide components is different between this work and Badu and Nagarajan, 28 the calculated entropy of formation from oxide components of La 2 Hf 2 O 7 at 298 K is not zero but 1.39 JÁ(molÁK) À1 . Ushakov et al 27 [38][39][40][41][42][43][44] and the invariant reactions are presented in Table 2. The calculated results are in good agreement with most experimental data.…”

Section: Binary Systemsmentioning

confidence: 99%

“…Figure 10 shows the calculated Gibbs energy change of 0.5La 2 O 3 + 0.5Al 2 O 3 =LaAlO 3 compared with the experimental data, 13 which is reproduced well within experimental error limits. For HfO 2 -Al 2 O 3 system, Plevacova et al 43 recently determined the eutectic temperature during the cooling of sample and eutectic composition by energy-dispersive spectrometer. The measured eutectic temperature was 2073 AE 35 K which is about 65-90 K lower than the previous results.…”

Section: Binary Systemsmentioning

confidence: 99%

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Thermodynamic Modeling of the HfO₂–La₂O₃–Al₂O₃ System

et al. 2016

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Based on phase equilibria, thermodynamic, and crystal structure data, the thermodynamic modeling of HfO2–La2O3–Al2O3 system is presented. Liquid phase is described by the modified quasichemical model considering the short‐range ordering in liquid solution. Solid solutions are described by the ionic sublattice model considering respective crystal structure. The model (La3+, Hf4+)2(Hf4+, La3+)2(O2−, Va)6(O2−)1(Va, O2−)1 successfully describes the structure defect, homogeneity range, and thermodynamic property of pyrochlore solid solution. A set of optimized model parameters is obtained which reproduces most experimental data well. Isothermal sections, liquidus and solidus projections, and Scheil reaction scheme are constructed.

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Section: Resultsmentioning

confidence: 99%

Section: Binary Systemsmentioning

confidence: 99%

Section: Binary Systemsmentioning

confidence: 99%

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Thermodynamic Modeling of the HfO₂–La₂O₃–Al₂O₃ System

et al. 2016

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“…EDS elemental mapping, high-resolution TEM, and layer-by-layer XPS analysis show that high irradiation dose facilitates the mixing of small UO 2 grains with amorphous Al 2 O 3 . Earlier work on bulk materials show that no solid solution forms in the UO 2 –Al 2 O 3 system. , For example, Plevacova et al reported the phase diagram of this system with a eutectic temperature of ∼1,850 °C. Below this temperature, Al 2 O 3 and UO 2 phases show no signs of mixing and crystallize separately.…”

Section: Discussionmentioning

confidence: 95%

Irradiation-enhanced Interactions at UO₂/Al₂O₃/Al Interfaces

et al. 2023

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Combustion synthesis is used to prepare thin UO 2 films on aluminum alloy substrates. This simple preparation method involves electrospraying uranyl nitrate + acetylacetone + 2methoxyethanol solution on the substrate, followed by a short annealing at 350 or 550 °C. The irradiation of films with a 40 Ar 2+ ion beam (energy of 1.7 MeV and fluences of 7.7 × 10 16 and 1.3 × 10 17 ions/cm 2 ) is conducted to investigate irradiation-induced restructuring processes. High-resolution transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) investigations show that the annealing temperature significantly influences the crystallinity and stability of materials during irradiation. A small amount of Mg in the alloy substrate diffuses into the amorphous Al 2 O 3 interfacial layer between the film and the substrate. Local thermal spikes from the incoming ions facilitate the irradiationinduced mixing of immiscible Al 2 O 3 and UO 2 for the materials prepared at 350 °C. This mass diffusion produces relatively large cavities at the interface. Selective diffusion of a more significant amount of Mg for the materials prepared at 550 °C suppresses the mixing of the Al 2 O 3 interlayer with the film but forms Mg y U 1−y O 2±x solid solutions during irradiation. Local thermal heating triggers the precipitation of a discontinuous crystalline MgO layer close to the film surface. The enhanced and selective diffusion of Mg into the film makes the materials prepared at 550 °C more robust and mechanically stable than those prepared at 350 °C.

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“…Experimental works on physical modeling of severe accidents are conducted in many research centers over the world [1]. For example, the studies of accidents within the following programs are PHEBUS [2], CORA [3], CODEX [4], KROTOS [5], «RASPLAV» [6], MACE [7], FARO/TERMOS [8], FRAG [9], Betulla [10], CORRECT [11], and VITI [12]. Most of the experiments are aimed at obtaining knowledge on the processes occurring at various stages of severe accidents [13,14].…”

Section: Introductionmentioning

confidence: 99%

Properties of a Prototype Corium of Nuclear Reactor

Skakov

Mukhamedov

Deryavko

et al. 2018

Science and Technology of Nuclear Installations

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The paper studies structure, phase composition, and thermophysical properties (TPP) (specific heat capacity, thermal diffusivity, and heat conductivity) of a prototype corium of a fast nuclear reactor (melt of core materials of nuclear reactor produced under out-of-pile conditions). The obtained data will be used to get more accurate understanding of main regularities of actual interaction of core materials of a nuclear reactor under a severe accident.

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Eutectic crystallization in the UO2–Al2O3–HfO2 ceramic phase diagram

Cited by 13 publications

References 9 publications

Thermodynamic Modeling of the HfO₂–La₂O₃–Al₂O₃ System

Thermodynamic Modeling of the HfO₂–La₂O₃–Al₂O₃ System

Irradiation-enhanced Interactions at UO₂/Al₂O₃/Al Interfaces

Properties of a Prototype Corium of Nuclear Reactor

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Eutectic crystallization in the UO2–Al2O3–HfO2 ceramic phase diagram

Cited by 13 publications

References 9 publications

Thermodynamic Modeling of the HfO2–La2O3–Al2O3 System

Thermodynamic Modeling of the HfO2–La2O3–Al2O3 System

Irradiation-enhanced Interactions at UO2/Al2O3/Al Interfaces

Properties of a Prototype Corium of Nuclear Reactor

Contact Info

Product

Resources

About

Thermodynamic Modeling of the HfO₂–La₂O₃–Al₂O₃ System

Thermodynamic Modeling of the HfO₂–La₂O₃–Al₂O₃ System

Irradiation-enhanced Interactions at UO₂/Al₂O₃/Al Interfaces