Cation Grain-Boundary Diffusion in Sodium Chloride

Riggs, Kenneth Ray; Wuttig, Manfred

doi:10.1063/1.1657268

Cited by 11 publications

(2 citation statements)

References 11 publications

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“…When the conclusions regarding impurities of Levy et al [20] are no-considered, while taking into account that at least Ca" lattice impurities are segregated towards the grain boundaries [27,28,29,30,31], and that wet grain boundaries exist and show holes as those represented in their micrographs and in Figures 2 and 10, it cannot be concluded that impurities hinder radiation damage development, but that impurities are segregated towards the same structural places where radiation damage defects are, and that, since these places are preferred anneal places, the radiation damage defects anneal as well.…”

Section: Discussionmentioning

confidence: 99%

Radiation-induced creep of confined NaCI

Celma

Donker

1994

Radiation Effects and Defects in Solids

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Samples of pure single crystals of NaCl and of a natural rock salt were simultaneously gamma-irradiated at an approximate constant dose rate (I5 kGy/h) and a constant temperature (IOOT) and for different lengths of time, resulting in integrated doses ranging from 0.02 to 44.6 MGy. Microstructural analysis showed that both incipient deformation structures and very advanced recovery structures develop during irradiation. This shows that gamma-irradiation does not only cause dislocations to develop, but also to migrate and interfere. It is also shown that Na-colloids do not only develop attached to dislocations, but migrate, accumulate and annihilate together with them. Microstructural criteria are established to distinguish between three different types of colloid-depleted areas that develop with increasing irradition: a) bleached areas produced by dislocation rearrangement and migration; b) bleached areas produced by diffusion along the dislocation rearrangements; and c) (in polycrystals) white areas produced by migration of wet (brine containing) highangle boundaries.

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Section: Discussionmentioning

confidence: 99%

Radiation-induced creep of confined NaCI

Celma

Donker

1994

Radiation Effects and Defects in Solids

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“…More complicated is the determination of the Cs-131 concentration. The photo-peak of Cs-131 registered by a NaI(T1) 40x 1 mm2 crystal practically coincides with the X-ray photo-peak of Ba-137 which results from internal conversion (10%) of the 0.66 MeV y-line [24]. Allowance for contributions of radiations of both isotopes into the intensity registered on a thin crystal was performed by using standards of pure isotopes.…”

Section: Measurements Of the Ratio Of Concentrations Of The Diffusingmentioning

confidence: 99%

Isotope Effect in Self‐Diffusion of Cs in Single Crystals of CsI

Klotsman

Polikarpova

Tatarinova

et al. 1974

Physica Status Solidi (b)

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The simultaneous diffusion of Cs-131 and Cs-137 has been measured over the temperature range 470 to 600 "C. The isotope effect was measured by the method of separation of the radiations of the two isotopes. The strength of the isotope effect is E = fAK = = (0.54 -t 0.02) and is independent of temperature within the experimental error. This indicates that the contribution of divacancies (cation-anion vacancy pairs) to the selfdiffusion in CsI is small and the predominant mechanism of self-diffusion in these crystals s the diffusion via free monovaeancies. Es wird die gleichzeitige Diffusion von Cs-131 und (3-137 im Temperaturbereieh von470 bis 600 "C gemessen. Der Isotopeneffekt wurde mit der Methode der Trennung der Strahlung der beiden Isotope gemessen. Die Starke des Isotopeneffekts ist E = jAK = = (0,54 0,02) und ist unabhangig von der Temperatur innerhalb der experimentellen Fehlergrenzen. Dies zeigt, da13 der Beitrag von Doppelleerstellen (Kationen-Anionenleerstellenpaare) zur Selbstdiffusion in CsJ klein ist und der vorherrschende Mechanismus der Selbstdiffusion in diesen Kristallen die Diffusion uber freie Monoleerstellen ist.

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Cation diffusion along boundaries in sodium chloride

Harris

Fiasson

1976

Phys. Stat. Sol. (a)

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The investigation of 22Na tracer diffusion in NaCl for different annealing times t at 633 K has revealed an inhomogeneous component of fast diffusion at small t, identified as substructure diffusion in single crystals and as grain boundary diffusion in bicrystals. In the latter case the product of boundary diffusion coefficient times boundary width was determined. Substructure and boundary diffusion are associated with a thickness dimension of several μm, which suggests the enhanced transport is most probably due to segregated and/or precipitated residual impurities. The effect of a constant applied electric field is to magnify the inhomogeneous component of transport by a factor that depends on the ratio of the mobility in the substructure to the mobility in the lattice.

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Cation Grain-Boundary Diffusion in Sodium Chloride

Cited by 11 publications

References 11 publications

Radiation-induced creep of confined NaCI

Radiation-induced creep of confined NaCI

Isotope Effect in Self‐Diffusion of Cs in Single Crystals of CsI

Cation diffusion along boundaries in sodium chloride

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