Mechanical properties of fluorite-related oxides subjected to swift ion irradiation: Pyrochlore and zirconia

Sattonnay, G.; Moll, S.; Desbrosses, V.; Bekale, Vincent Menvie; Legros, C.; Thomé, L.; Monnet, I.

doi:10.1016/j.nimb.2010.05.035

Cited by 16 publications

(6 citation statements)

References 19 publications

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“…These compounds transform to chemically disordered, fcc-structured (A 2 B 2 )O 7 solid solutions by the formation of A B and B A cation antisite defects and the accompanying rearrangement of anions. This disordering process strongly influences many transport properties (e.g., thermal conductivity), as well as mechanical and magnetic properties 40,41 . Therefore, it is expected that the phase transformation from the initial hexagonal Ti 3 AlC 2 phase to the metastable γ-(Ti 3 Al)C 2 similarly enhances the radiation tolerance of this material, allowing it to incorporate a high concentration of irradiation-induced defects while maintaining crystallinity.…”

Section: Discussionmentioning

confidence: 99%

Disorder in Mn+1AXn phases at the atomic scale

et al. 2019

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Atomic disordering in materials alters their physical and chemical properties and can subsequently affect their performance. In complex ceramic materials, it is a challenge to understand the nature of structural disordering, due to the difficulty of direct, atomic-scale experimental observations. Here we report the direct imaging of ion irradiation-induced antisite defects in Mn+1AXn phases using double CS-corrected scanning transmission electron microscopy and provide compelling evidence of order-to-disorder phase transformations, overturning the conventional view that irradiation causes phase decomposition to binary fcc-structured Mn+1Xn. With the formation of uniformly distributed cation antisite defects and the rearrangement of X anions, disordered solid solution γ-(Mn+1A)Xn phases are formed at low ion fluences, followed by gradual transitions to solid solution fcc-structured (Mn+1A)Xn phases. This study provides a comprehensive understanding of the order-to-disorder transformations in Mn+1AXn phases and proposes a method for the synthesis of new solid solution (Mn+1A)Xn phases by tailoring the disorder.

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Section: Discussionmentioning

confidence: 99%

Disorder in Mn+1AXn phases at the atomic scale

et al. 2019

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“…Although swift heavy ion irradiation was used to investigate defects in fluorite oxides and their derivatives decades ago and annealing processes for the defects formed have already been discussed in the literature, − only recently was attention brought to the direct measurement of energetics of radiation-induced defects and their thermal annealing. − In all of these studies, the behavior of the bombarding ions in the target (stopping and range, implantation, sputtering) is calculated using SRIM software. , In general, once the samples have “cooled off” for several months to allow short half-life elements to decay, they require no special handling in calorimetric studies, as radioactivity levels are back to background (unless the material was radioactive per se , in which case special handling is still required).…”

Section: Experimental Thermochemical Methods For Radioactive Materialsmentioning

confidence: 99%

Thermodynamics of Fluorite-Structured Oxides Relevant to Nuclear Energy: A Review

Shelyug

Navrotsky

2021

ACS Earth Space Chem.

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Fluorite structured materials have shown their applicability in various fields both on and off Earth. In particular, these oxides find extensive application in nuclear energy and the use of actinides in space and planetary settings, thermal and environmental barrier coatings, aerospace applications, catalysts, fuel cells, and batteries. Research done on thermodynamic data collection should be structured to facilitate its use in predictive calculations. In this review, we bring together several decades of experimental thermodynamic analysis of fluorite-based oxides with an emphasis on their relevance to all stages of the nuclear fuel cycle. This review is relatively short in the interest of offering an accessible perspective, especially for scientists early in their careers in nuclear science.

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“…Although the mechanical properties are one of the most important physical properties for nuclear applications, only limited investigations on irradiated ZrO2 were reported. 7,[127][128][129] Most of the reports on the mechanical properties are based on nano-indentation measurements on ion-irradiated specimens owing to the shallow irradiated depth. Fig.…”

Section: Mechanical Properties Of Ion-irradiated Zirconium Oxidesmentioning

confidence: 99%