Gamma (60Co) irradiation and thermal effect on redox behavior of interlayer iron in montmorillonite

Chikkamath, Santosh; Manjanna, J.; Kabadagi, Anand; Patil, Dinesh; Kar, Aishwarya S.; Tomar, B. S.

doi:10.1016/j.clay.2020.105893

Cited by 9 publications

(10 citation statements)

References 38 publications

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“…Under these considerations, major atoms might bring valence elevation. Nevertheless, a decline is observed within 1000 kGy‐irradiated species, indicating that other reductive species were generated (e.g., free e derived from dehydroxylation or H 2 O radiolysis 47 ). Considering the TGA analysis, dehydroxylation is more extensive than H 2 O radiolysis, probably generating numerous free e. If they were mainly derived from this procedure, valance elevation can be more visible.…”

Section: Resultsmentioning

confidence: 99%

“…These procedures cannot be ignored as H 2 O exists in species normally and readily decomposes under EB irradiation. 14,44,45 After radiolysis, numerous H(O)• radicals can be formed, probably combining together forming H 2 or H 2 O 2 leaving off species surface 14,46,47 or reacting with framework defects such as Si-(O)• radicals introducing other OHs, decreasing water amount. Commonly, the previous procedures occurred synchronously.…”

Section: H 2 O Amount Analysismentioning

confidence: 99%

“…In detail, Equations ( 1)-( 3) describe surface adsorbed O 2 /H 2 O radiolysis and evaporation. 47,55,56 Equation (4) describes tetrahedral sheet destruction, generating defects and micro-holes, reducing surface wettability. Equation ( 5) describes an interface cleavage of tetrahedron and octahedron, inducing collapse, reducing lattice size.…”

Section: H (O) ⋅ or 𝑒 Movementioning

confidence: 99%

“…Equations ( 11)-( 16) describe e move, H-atom migration, and transformation. 47 Equation ( 17) describes a transformation of Al/Si-centered defects. Equations (18) and ( 19) describe relinking of defects within tetrahedron and octahedron.…”

Section: H (O) ⋅ or 𝑒 Movementioning

confidence: 99%

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An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

Wang,

Sun,

Xia

et al. 2023

J Am Ceram Soc.

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Electronic components made by inorganics (e.g., mica) play key roles in function exertion of instruments working in outer‐layer space, enduring long‐term β ray irradiation. Its damage is vital while explored rarely. Herein, pure muscovite crystals were chosen and irradiated by an electron beam (EB) in air with dose up to 1000 kGy. Then, micro‐geometry morphology variation in Z‐axis and microstructural transformation mechanism were explored by XRD, FT‐ATR IR, TGA, XPS and CA analysis. Main results reveal that muscovite lattice is unstable to EB irradiation. With dose increases to 1000 kGy interlayer space d of (002) lattice varied 2% near 0.2 Å. At low dose irradiation lattice expansion is readily to occur while at higher dose it is lattice shrinkage, showing a transformation from expansion to shrinkage. Concurrently, chemical structure varied, H2O amount increased, metal element valance and surface wettability were reduced. Where, dehydroxylation occurred exceeding H2O radiaolysis and evaporation, and framework cleavage be severe. Binding energies of metals of 1000 kGy‐irradiated species decreased by 0.2 eV, CA of 100 kGy‐irradiated species increased by 10°. Intrinsic mechanisms involve framework destruction, H‐atom migration, hydrogen bond formation/destruction and H2O radiolysis. At low dose irradiation, H‐atom migration and hydrogen bond formation/destruction are predominant, inducing lattice expansion; at higher dose, framework cleavage is intensive and crucial, inducing shrinkage. During which, partial H2O occurred radiolysis, reducing valence. Generally, H‐atom migration and interface cleavage played key roles in microgeometry morphology variation of muscovite crystal under EB irradiation at 0–1000 kGy. To enhance muscovite geometry morphology‐stability under a long‐term β‐ray irradiation condition OH and hydrogen bond contents should be reduced and interface region should be strengthened (e.g., lessening vacancies or compacting stacking). This conclusion promotes design of radiation‐resistant silicate material, guiding manufacture of electronic component used in aerospace industry, significant.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Section: H 2 O Amount Analysismentioning

confidence: 99%

Section: H (O) ⋅ or 𝑒 Movementioning

confidence: 99%

Section: H (O) ⋅ or 𝑒 Movementioning

confidence: 99%

See 2 more Smart Citations

An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

Wang,

Sun,

Xia

et al. 2023

J Am Ceram Soc.

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“…For example, both 60 Co irradiation (60 kGy) and dry heat (90°C for 48 hr) significantly increased extractable Mn abundances in three soils (Wolf et al, 1989). Chikkamath et al (2021) found complex but similar oxidation of interlayer Fe 2+ in montmorillonite followed by reduction with increased duration of 60 Co irradiation at a dose rate of 0.6 kGy/h for 18 h and with increased temperature from 50 to 300°C, and demonstrated that redox reactions involving interlayer Fe could reduce aqueous Cr(VI).…”

Section: Sterilization By Gamma (γ) Irradiation 54mentioning

confidence: 94%

Planning Implications Related to Sterilization-Sensitive Science Investigations Associated with Mars Sample Return (MSR)

et al. 2022

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Radiation‐induced corrosion model for copper‐coated used fuel containers. Part 1. Validation of the bulk radiolysis submodel

Behazin

Briggs

King³

2023

Materials & Corrosion

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This paper describes the development of a mixed‐potential model coupling the anodic dissolution of copper to the oxidation and reduction of various radiolysis products, allowing the long‐term prediction of the radiation‐induced corrosion of copper. The overall conceptual model is described, followed by a more detailed discussion of the use of the commercial COMSOL software to predict bulk radiolysis behavior. Various methods are used to validate the COMSOL bulk radiolysis model, including comparison with short‐term experimental data reported in the literature. The underlying principles and assumptions along with the results of the validation procedures are also presented.

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Gamma (60Co) irradiation and thermal effect on redox behavior of interlayer iron in montmorillonite

Cited by 9 publications

References 38 publications

An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

Planning Implications Related to Sterilization-Sensitive Science Investigations Associated with Mars Sample Return (MSR)

Radiation‐induced corrosion model for copper‐coated used fuel containers. Part 1. Validation of the bulk radiolysis submodel

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