A Mössbauer Study of Molybdenum Oxidation Kinetics

Zhetbaev, A. K.; Ibragimov, S. A.; Shokanov, A. K.

doi:10.1051/jphyscol:19801148

Cited by 3 publications

(7 citation statements)

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“…Figure 4 presents the eMS spectra obtained at 0 • , 30 • , and 60 • . Overall, the spectra can be fit with a quadrupole-splitting distribution (D1) with parameters (Table 1) typical of ionic Fe 2+ [13]. Complete fits to the data require a second component (D2) due to Fe 3+ ions in unresolved local environments.…”

Section: Resultsmentioning

confidence: 99%

“…After adjusting for the reference scale [16] for α-Fe and changing the sign to represent a conventional isomer-shift scale, the one doublet has an isomer shift δ RT1 = 1.19 mm/s with a quadrupole splitting ∆E 1 = 1.20 mm/s while the second has δ RT2 = 0.21 mm/s with ∆E 2 = 0.75 mm/s, corresponding to the Fe 2+ and Fe 3+ states in a ratio of approximately 3:1. The authors also report that oxidation in air produces molybdenum with valences of 4 + and 6 + , with other valence states making no significant contribution [13].…”

Section: Introductionmentioning

confidence: 97%

“…The physics behind the multiple above-mentioned applications is linked to the material phenomenology, which includes defects such as oxygen vacancies, point defects, and impurity doping, all of which can be studied by Mössbauer spectroscopy (MS), as shown in earlier studies [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…In an early 57 Fe MS study by Zhetbaev et al on the formation kinetics of Mo oxides [13], a 99.5% Mo foil coated with a 57 Co isotope was subjected to different annealing atmospheres, both in hydrogen and in air. All measurements were performed at RT.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropy of the Electric Field Gradient in Two-Dimensional α-MoO3 Investigated by 57Mn(57Fe) Emission Mössbauer Spectroscopy

et al. 2022

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Van der Waals α-MoO3 samples offer a wide range of attractive catalytic, electronic, and optical properties. We present herein an emission Mössbauer spectroscopy (eMS) study of the electric-field gradient (EFG) anisotropy in crystalline free-standing α-MoO3 samples. Although α-MoO3 is a two-dimensional (2D) material, scanning electron microscopy shows that the crystals are 0.5–5-µm thick. The combination of X-ray diffraction and micro-Raman spectroscopy, performed after sample preparation, provided evidence of the phase purity and crystal quality of the samples. The eMS measurements were conducted following the implantation of 57Mn (t1/2 = 1.5 min), which decays to the 57Fe, 14.4 keV Mössbauer state. The eMS spectra of the samples are dominated by a paramagnetic doublet (D1) with an angular dependence, pointing to the Fe2+ probe ions being in a crystalline environment. It is attributed to an asymmetric EFG at the eMS probe site originating from strong in-plane covalent bonds and weak out-of-plane van der Waals interactions in the 2D material. Moreover, a second broad component, D2, can be assigned to Fe3+ defects that are dynamically generated during the online measurements. The results are compared to ab initio simulations and are discussed in terms of the in-plane and out-of-plane interactions in the system.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Anisotropy of the Electric Field Gradient in Two-Dimensional α-MoO3 Investigated by 57Mn(57Fe) Emission Mössbauer Spectroscopy

et al. 2022

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“…The majority of bcc structure metals are the perspective materials in the nuclear technology and space engineering. Among them, the molybdenum and niobium are the most investigated in details [13][14][15][16][17][18]. It has been established that the point defects generated in crystal structure, after irradiation, interacted between themselves like impurity atoms.…”

Section: The Point Defects Interactions In Neutrons Irradiated Tungstmentioning

confidence: 99%

Mössbauer Spectroscopy of Radiation — Induced Processes in Metallic Systems

Mukashev¹,

Shokanov²,

Umarov³

2015

New Trends in Alloy Development, Characterization and Application

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Nuclear power engineering development is held back by both the nuclear reactor safety reasons and the problems related to creating materials suitable for using in the reactors. These materials must be resistant to radiation, able to stand high temperatures, and stable to the corrosive environments. In this work, the general regularity of the interstitial atoms and vacancy interaction with impurity substitutional atoms of 57 Co(57 Fe) in bcc lattice metals has been systematically investigated for the first time. The electron states and structure of "impurity-interstitial" atom, "impurity-vacancy" systems, and their mössbauer parameters are defined. For the first time, by the Mössbauer effect study, the complexes annealing stages from isochronal annealing temperature have been defined. The mössbauer imputity atoms vibrations rms amplitude values and their binding energy are determined. It has been experimentally established that atom mobility considerably increases in radiation-damaged zones created by high-velocity charged particles, fission fragments, or ionized displaced atoms. The compound dumbbell state in bcc metals was investigated, and it was shown that unlike fcc metals, in the bcc metals the considerable quadrupole splitting was revealed, which enables us to separate them on different interstitial configurations around 57 Co impurity. It was also established that non-cubic charge distribution around a mössbauer atom leads to the electric field gradient that causes the nuclear levels hyperfine splitting owing to quadrupole interaction.

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Moessbauer spectroscopy

Stevens¹,

Bowen²

1984

Anal. Chem.

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A Mössbauer Study of Molybdenum Oxidation Kinetics

Cited by 3 publications

References 0 publications

Anisotropy of the Electric Field Gradient in Two-Dimensional α-MoO3 Investigated by 57Mn(57Fe) Emission Mössbauer Spectroscopy

Anisotropy of the Electric Field Gradient in Two-Dimensional α-MoO3 Investigated by 57Mn(57Fe) Emission Mössbauer Spectroscopy

Mössbauer Spectroscopy of Radiation — Induced Processes in Metallic Systems

Moessbauer spectroscopy

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