Potassium surface enrichment in mixed alkali glass irradiated with electrons

Zemek, J.; Gedeon, Ondrej

doi:10.1016/j.jnoncrysol.2004.04.025

Cited by 12 publications

(10 citation statements)

References 26 publications

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“…Under irradiation the migration of species and surface composition modification assisted by an electric field has been already observed, in particular, for insulators in which the charge effect appeared rapidly (e.g. Battaglin et al 1982;Mosbah & Duraud 1998;Zemek & Gedeon 2004).…”

Section: Discussionmentioning

confidence: 95%

Chemical and morphological evolution of a silicate surface under low-energy ion irradiation

Gengembre

Frere²,

Grimblot

et al. 2008

A&A

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Aims. Olivine surfaces have been subjected to low-energy ion irradiation with H + , He + and Ar + at energies within the keV range in order to simulate the effects of energetic gas-grain interactions within shocked regions of the interstellar medium. Methods. The induced modifications in the chemical composition and the bonding configuration of the upper and the near surface regions were monitored in situ by X-ray photoelectron spectroscopy (XPS). The associated morphological evolution of the samples was studied by atomic force microscopy (AFM). Results. Results show that the surface chemistry evolves during irradiation with a noticeable Mg enrichment relative to Si. This evolution is interpreted as coming from magnesium atom diffusion driven by the electric field caused by the positive ion implantation. The iron valence state is also strongly affected by irradiation, with reduction occurring at relatively high fluxes. However, at low fluxes the iron is found to oxidise from Fe 2+ to Fe 3+ due to a charge transfer between the incident positive ions and the iron in the sample. The atomic force microscopy results show that the surface roughness tends to increase with irradiation and that this roughness influences the surface chemical reactivity of the grains, as shown by the enhanced formation of carbonate on the surfaces when they are exposed to a CO 2 atmosphere. The implications for the evolution of interstellar dust include an enhanced dust catalytic activity. These effects would arise from modification under irradiation of the surface reactivity and an increase in the available grain surface area.

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Section: Discussionmentioning

confidence: 95%

Chemical and morphological evolution of a silicate surface under low-energy ion irradiation

Gengembre

Frere²,

Grimblot

et al. 2008

A&A

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“…The detection angle was surface normal except for NKS glass, where additional measurements were performed under 60°counted from the surface normal. More details can be found in [12,13].…”

Section: Methodsmentioning

confidence: 99%

Changes in alkali-silicate glasses induced with electron irradiation

Gedeon

Zemek

Jurek

2008

Journal of Non-Crystalline Solids

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“…Although unrelated to the hard composites, AlMgB 14 is also a semiconductor and due to the arrangement of the B lattice and interstitial metal atoms, it is possible that electronic conduction in single crystals may be very anisotropic [25]. Preliminary observations by EDS have indicated that the metal atoms are mobile when irradiated by an electron beam, similar to ions in many oxide glasses [112][113][114][115].…”

Section: 9: Applicationsmentioning

confidence: 99%

Improving Hardness and Toughness of Boride Composites Based on AIMgB<sub>14</sub>

Peters

2007

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Potassium surface enrichment in mixed alkali glass irradiated with electrons

Cited by 12 publications

References 26 publications

Chemical and morphological evolution of a silicate surface under low-energy ion irradiation

Chemical and morphological evolution of a silicate surface under low-energy ion irradiation

Changes in alkali-silicate glasses induced with electron irradiation

Improving Hardness and Toughness of Boride Composites Based on AIMgB<sub>14</sub>

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