Annealing of radiomanganese in KMnO4 and in mixed crystals of KMnO4 with KClO4, KReO4 and KBF4

Teeling, M.T.A.; Aten, A.H.W.; Louwrier, P.W.F.; Boersma, J.; Apers, Désiré

doi:10.1016/0022-1902(81)80060-7

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…This phenomenon -a kind of recrystallization from the debris of the disordered lattice -has been designated as "template effect" [20]. Another indication for proper recombination during thermal annealing are the increasing retentions in mixed crystals such as K 2 Cr0 4 -K 2 BeF 4 [20][21][22][23][24][25] and KMn0 4 -KBF 4 [26] in which the matrix component does not contain the proper ligand.…”

Section: Introductionmentioning

confidence: 98%

Chemical Effects of Nuclear Transformations in Mixed Crystals 8. Thermal Annealing of ¹⁸⁶Re in Neutron Irradiated K₂ReBr₆-K₂SnCl₆ Mixed Crystals. I

Müller

1983

Radiochimica Acta

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In Κ, ReBr 6 -K 2 SnCl 6 mixed crystals the nuclear process " 5 Re (n, y) 1,6 Re produces according to the chemical analysis all species 1 " ReBr"Cl^" (n = 0 ... 6) and (from excited or interstitial 1,6 Re recoils) 1 " ReO;. Upon thermal annealing 1 " ReO; decreases and the fractions of all " 6 ReBr"CljI" species increase. Approximately one third of the annealing occurs at 50°C producing merely 1 " ReBrJ ~ which is strong evidence for a proper recombination of 1 " Re with its six originally coordinated Br ligands. The remaining annealing proceeds with increasing temperature and is due to the reaction of 1 " Re recoil atoms with halides, both CI and Br, from the lattice. As there is no preference for a special species no conclusions can be drawn concerning the lattice site where these reacting '"Re recoils come to rest.

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Section: Introductionmentioning

confidence: 98%

Chemical Effects of Nuclear Transformations in Mixed Crystals 8. Thermal Annealing of ¹⁸⁶Re in Neutron Irradiated K₂ReBr₆-K₂SnCl₆ Mixed Crystals. I

Müller

1983

Radiochimica Acta

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“…Through mixed crystals studies the chemical consequences of neutron capture were understood via the intermolecular competition between the size of the reaction zone and the hot atom reactions depending on the mol-fraction of the target [2,3]. Over the years, a number of studies have been performed on the chemical behaviour of foreign ions or atoms implanted in crystals of various oxyanionic salts [1,2,4].…”

Section: Introductionmentioning

confidence: 99%

Chemical stabilization of recoil ⁵⁶Mn in MnSO₄-KClO₄ mixed crystals following (n, γ) process

Mishra¹,

Vijaya²

2005

Radiochimica Acta

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Stabilization of recoil 56 Mn in mixed crystals of MnSO 4 -KClO 4 was studied with especial emphasis on isothermal annealing of neutron irradiated target. The results showed that * MnO 4 − yield (%) varies linearly with the increase in perchlorate concentration from 0.100 to 0.500 mol fraction, reaching a maximum value of (89.0 ± 1.1)%. However, the value of intercept (P 0 ) obtained was (63.0 ± 1.2)%. Isothermal annealing of 56 Mn in the present mixed crystal (MnSO 4 -KClO 4 ) of the two molar concentrations (i.e., 0.100 and 0.500 mol fraction) of perchlorate was studied at different temperatures for a desired length of time. The retention values increased with increasing temperature and time of annealing for both the samples. The values found for the two concentrations were (67.0 ± 1.0)% and (89.0 ± 1.1)%, respectively, at room temperature. Retention value increased gradually in the beginning but slowed down with a lapse of time and finally attained saturation within about 20 min of heating at 373 K in both cases. Limiting saturations were found to be (86.0 ± 1.0)% (max) for 0.100 molar concentration and (96.0 ± 0.8)% (max) for 0.500 molar concentration.The rate of annealing was found to increase while the extent of annealing decreased. The recoil re-entry process obeys first order rate law and the energies of activation for the system (MnSO 4 -KClO 4 ) computed from the classical Arrhenius plots were found to be 0.15 ± 0.05 eV for 0.1 molar ratio and (2.5 ± 0.06) × 10 −2 eV for 0.5 molar ratio. The low value of activation energy indicates that there is a recombination of recoil fragments and participation of defect controlled reactions in thermal annealing, leading to higher saturation retention in 0.500 molar ratio. The results obtained are discussed in the light of vacancies created by the dopant and helping in the proposed recoils stabilization mechanism.

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Reply to some comments on “Chemical effects of56Mn-recoils in mixed crystals of potassium permanganate with perchlorates”

Mishra

Singh

1987

Journal of Radioanalytical and Nuclear Chemistry Letters

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Annealing of radiomanganese in KMnO4 and in mixed crystals of KMnO4 with KClO4, KReO4 and KBF4

Cited by 6 publications

References 15 publications

Chemical Effects of Nuclear Transformations in Mixed Crystals 8. Thermal Annealing of ¹⁸⁶Re in Neutron Irradiated K₂ReBr₆-K₂SnCl₆ Mixed Crystals. I

Chemical Effects of Nuclear Transformations in Mixed Crystals 8. Thermal Annealing of ¹⁸⁶Re in Neutron Irradiated K₂ReBr₆-K₂SnCl₆ Mixed Crystals. I

Chemical stabilization of recoil ⁵⁶Mn in MnSO₄-KClO₄ mixed crystals following (n, γ) process

Reply to some comments on “Chemical effects of56Mn-recoils in mixed crystals of potassium permanganate with perchlorates”

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Annealing of radiomanganese in KMnO4 and in mixed crystals of KMnO4 with KClO4, KReO4 and KBF4

Cited by 6 publications

References 15 publications

Chemical Effects of Nuclear Transformations in Mixed Crystals 8. Thermal Annealing of 186Re in Neutron Irradiated K2ReBr6-K2SnCl6 Mixed Crystals. I

Chemical Effects of Nuclear Transformations in Mixed Crystals 8. Thermal Annealing of 186Re in Neutron Irradiated K2ReBr6-K2SnCl6 Mixed Crystals. I

Chemical stabilization of recoil 56Mn in MnSO4-KClO4 mixed crystals following (n, γ) process

Reply to some comments on “Chemical effects of56Mn-recoils in mixed crystals of potassium permanganate with perchlorates”

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Chemical Effects of Nuclear Transformations in Mixed Crystals 8. Thermal Annealing of ¹⁸⁶Re in Neutron Irradiated K₂ReBr₆-K₂SnCl₆ Mixed Crystals. I

Chemical Effects of Nuclear Transformations in Mixed Crystals 8. Thermal Annealing of ¹⁸⁶Re in Neutron Irradiated K₂ReBr₆-K₂SnCl₆ Mixed Crystals. I

Chemical stabilization of recoil ⁵⁶Mn in MnSO₄-KClO₄ mixed crystals following (n, γ) process