High-Temperature Oxidation of Zircaloy-4 in Air Studied with Labeled Oxygen and Raman Imaging

Gutierrez

et al. 2018

J Raman Spectroscopy

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Recently, unusual Raman signals were observed in different works conducted on thin zirconia layers grown on zirconium alloys simulating in-reactor materials after high fluence ion irradiation or for samples cut from fuel rods irradiated in nuclear plants. As such, these spectra clearly do not correspond to any known spectrum of a pure standard zirconia phase. Therefore, the analysis conducted in this paper aims to provide a better understanding of these peculiar Raman features. For that purpose, specific ion-irradiated samples were analysed. In situ Raman spectroscopy was first used to follow the irradiation process. Then, samples were characterized using different excitation wavelengths. Finally, the effects of oxygen isotopic substitution were examined in details. Results are discussed in terms of disorder and size-related effects.

Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Raman spectra analysis of ZrO₂ thermally grown on Zircaloy substrates irradiated with heavy ion: Effects of oxygen isotopic substitution

Ciszak

Gutierrez

et al. 2018

J Raman Spectroscopy

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“…This is why we systematically used high 18 O content, for which the expected line shifts are by far higher than 1.5 cm -1 . In such cases, it has been shown that Raman and SIMS images compare well [19,23], and that stress effects can be neglected.…”

Section: O Concentration Determination Using Raman Spectroscopymentioning

confidence: 99%

Experimental study of oxidation in oxygen, nitrogen and steam mixtures at 850∘C of pre-oxidized Zircaloy-4

Gestin

Journal of Nuclear Materials

Coindreau

et al. 2019

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“…Nevertheless, in the high 18 O 2154 concentration range, it has been shown that Raman and SIMS concentration images compared well, spatially as well as quantitatively. [80] Again, it is necessary to keep in mind that 18 O concentration estimates are averaged values within the probing spot (about 2 μm 3 ). Indeed, in the oxide layers, the grain size was found to lie between a few tens and a few hundred micrometers from SEM/FEG images.…”

Section: Consequences Of Oxygen Isotopic Substitution On the M-zro 2 ...mentioning

confidence: 99%

“…Nevertheless, in the high 18 O concentration range, it has been shown that Raman and SIMS concentration images compared well, spatially as well as quantitatively. [ 80 ]…”

Section: Using Labeled Oxygen During the Oxidation Testsmentioning

confidence: 99%

Raman imaging in corrosion science: High‐temperature oxidation of the zirconium alloys used in the nuclear industry as an example

Duriez

2021

J Raman Spectroscopy

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Successive technological improvements have made Raman imaging systems very efficient. Raman imaging applications now cover a wide range of scientific fields, including high-temperature materials corrosion, also known as dry corrosion. The analysis of the phenomena occurring during corrosion requires knowledge in metallurgy, thermodynamics, chemical kinetics, solid-state chemistry, and physics. Part of this information (crystallographic phases, stress state, oxygen transport, etc.) can be obtained, at least qualitatively, from the analysis of Raman images of the oxidation layer. Throughout this paper, we consider as a prototypal example the oxidation of a particular zirconium alloy, Zircaloy-4, used in the nuclear industry as cladding materials in light-water reactors. Through some examples, the aim of the present paper is to describe what kind of information this method can bring, to review its merits and weaknesses. The analysis protocols methods described herein are not exhaustive, but most probably represent a simple way to read and understand the Raman images. These few examples show that rather subtle details that concern phase distribution, strain, and oxygen transport can effectively be captured by this method. Most probably, Raman imaging may be applied to other alloys or systems as well.