Evidence of Void Lattice Formation in Heavily Irradiated NaCl

Vainshtein, D.I.; Altena, C.; Hartog, H. W. den

doi:10.4028/www.scientific.net/msf.239-241.607

Cited by 19 publications

(32 citation statements)

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“…Note that real voids are not spherical [2][3][4], so the actual stresses can be higher than estimated by Eq. (13).…”

Section: Back Reaction Modelmentioning

confidence: 93%

“…Irradiation of NaCl samples generates H and F centres, which are collected together to form chlorine bubbles and sodium colloids [1]. Our experiments [2][3][4] on different NaCl samples, heavily irradiated with 0.5 MeV electrons up to fluences of 6 Â 10 18 cm À2 , have shown that with increasing irradiation dose, voids are formed followed by explosion-like fracture of the material. We explain this by a back reaction between radiolytic products.…”

Section: Introductionmentioning

confidence: 89%

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A model for void-induced back reaction between radiolytic products in NaCl

Turkin

Dubinko

Vainshtein

et al. 2002

Nuclear Instruments and Methods in Physics Research Section B:

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Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. AbstractA kinetic model is formulated for the chemical reaction between radiolytic sodium colloids and gas bubbles, which are brought into contact with each other during the exposure to ionising radiation by the growing voids. The reaction starts with the evaporation of Na atoms into the void due to the localized heat release caused by reactions between chlorine molecules colliding with the colloid surface. It is shown that this exothermic and autocatalytic reaction leads to a sudden temperature increase inside the void, which gives rise to thermoelastic stresses in the surrounding matrix. Tangential stresses might exceed the threshold stress required for localized cleavage of the matrix resulting in crack formation and mechanical instability of NaCl under high dose irradiation. Ó 2002 Published by Elsevier Science B.V.

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“…Note that real voids are not spherical [2][3][4], so the actual stresses can be higher than estimated by Eq. (13).…”

Section: Back Reaction Modelmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 89%

A model for void-induced back reaction between radiolytic products in NaCl

Turkin

Dubinko

Vainshtein

et al. 2002

Nuclear Instruments and Methods in Physics Research Section B:

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“…Until recently, the only known secondary www.elsevier.com/locate/nimb mechanism was that proposed by Hobbs et al [3] for halides to explain perfect loop formation in the absence of displacements in the cation sublattice. However, this mechanism cannot explain the simultaneous formation of voids, observed in many ionic systems [2,9].…”

Section: Introductionmentioning

confidence: 99%

“…Experimental data [9] obtained for pure, doped and natural rock salt samples, which had been irradiated with 0.5 MeV electrons up to fluences of 6 Â 10 18 electrons/cm 2 (i.e. about 300 Grad), show that with increasing irradiation dose, voids are formed followed by their transition to large (hundreds of nm in size) penny-shaped cracks resulting in a subsequent explosion-driven fracture of the material (Fig.…”

Section: Void Formation In Irradiated Naclmentioning

confidence: 99%

“…colloidal sodium and molecular chlorine, which was the subject of numerous investigations [3][4][5][6][7][8][9], some of them concluding that saturation of radiation damage with increasing irradiation dose occurs well within the acceptable range for repository safety [6,7]. On the other hand, more recent systematic experiments on many heavily irradiated samples have shown that in many doped and natural rock salt samples, the stored energy value increases with increasing dose without any sign of saturation [8] and more important is that large voids are produced, which initiate explosive fracture of the samples [9].…”

Section: Introductionmentioning

confidence: 99%

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New scenario for the accumulation and release of radiation damage in rock salt and related materials

Hartog

Vainshtein

Dubinko

et al. 2002

Nuclear Instruments and Methods in Physics Research Section B:

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Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. AbstractRock salt might be a promising geological medium for a radioactive waste repository. However, we have observed that even a basically stable compound such as NaCl may become unstable after heavy irradiation. As a result of the irradiation, dislocations, Na and Cl 2 precipitates and large voids are produced followed ultimately by sudden explosiondriven fracture of the material. We present a new concept of the radiation-induced micro-structural evolution, which explains the phenomena observed in heavily irradiated NaCl samples. This concept can be a prototype of a more general assessment of radiation effects in crystalline radwaste and repository materials, which is necessary for the evaluation of critical effects and maximization of the safety of repositories. Ó

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Study of Sodium Colloids in Heavily Irradiated NaCl Crystals by Nuclear Magnetic Resonance

Kanert

Schmidt

Küchler

et al. 1997

Ber Bunsenges Phys Chem

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Strong irradiation of NaCl crystals results in a formation of sodium colloids which exhibit metallic properties. In consequence, besides the 23 Na line of NaCl a second well-separated 23 Na line occurs in the NMR spectrum caused by the Knight shift of the conduction electrons. We present Knight shift and nuclear spin relaxation mea surements performed on the "metallic" 23 Na line in e "-irradiated NaCl single-crystals between about 4 and 390 K. Evaluation of the data leads to detailed information on the electronic properties, atomic self-diffusion, and melting behavior of the colloids. The results are discussed in view of corresponding data obtained in bulk sodium.

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Evidence of Void Lattice Formation in Heavily Irradiated NaCl

Cited by 19 publications

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A model for void-induced back reaction between radiolytic products in NaCl

A model for void-induced back reaction between radiolytic products in NaCl

New scenario for the accumulation and release of radiation damage in rock salt and related materials

Study of Sodium Colloids in Heavily Irradiated NaCl Crystals by Nuclear Magnetic Resonance

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