Damage accumulation in Al2O3 during H2+ or He+ ion irradiation

Sasajima, N.; Matsui, Tsuneo; Furuno, S.; Hojou, K.; Otsu, Hiroshi

doi:10.1016/s0168-583x(98)00810-6

Cited by 36 publications

(26 citation statements)

References 19 publications

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“…These precipitation and growth mechanisms show that diffusion of olivine species at room temperature must be assisted by irradiation. Formation ofHe bubbles after He" irradiation has already been reported in numerous studies (e.g., Johnson et al, 2000 for insulating ceramic; Raineri et al, 2000;Sasajima et al, 1999 for AI 2 0 3 ) . All experimental evidence and the scheme presented in Fig.…”

Section: Chemical Evolutionmentioning

confidence: 54%

Low‐energy helium ion irradiation‐induced amorphization and chemical changes in olivine: Insights for silicate dust evolution in the interstellar medium

Carrez

Demyk

Cordier

et al. 2002

Meteorit & Planetary Scien

117

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Abstract-We present the results ofirradiation experiments aimed at understanding the structural and chemical evolution ofsilicate grains in the interstellar medium. A series of'Het irradiation experiments have been performed on ultra-thin olivine, (Mg,FehSi0 4 samples having a high surface/volume (S/V) ratio, comparable to the expected S/V ratio of interstellar dust. The energies and fluences of the helium ions used in this study have been chosen to simulate the irradiation of interstellar dust grains in supernovae shock waves. The samples were mainly studied using analytical transmission electron microscopy. Our results show that olivine is amorphized by low-energy ion irradiation. Changes in composition are also observed. In particular, irradiation leads to a decrease ofthe atomic ratios O/Si and Mg/Si as determined by x-ray photoelectron spectroscopy and by x-ray energy dispersive spectroscopy. This chemical evolution is due to the differential sputtering of atoms near the surfaces. We also observe a reduction process resulting in the formation ofmetallic iron. The use of very thin samples emphasizes the role of surface/volume ratio and thus the importance of the particle size in the irradiation-induced effects. These results allow us to account qualitatively for the observed properties of interstellar grains in different environments, that is, at different stages oftheir evolution: chemical and structural evolution in the interstellar medium, from olivine to pyroxenetype and from crystalline to amorphous silicates, porosity of cometary grains as well as the formation of metallic inclusions in silicates.

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Section: Chemical Evolutionmentioning

confidence: 54%

Low‐energy helium ion irradiation‐induced amorphization and chemical changes in olivine: Insights for silicate dust evolution in the interstellar medium

Carrez

Demyk

Cordier

et al. 2002

Meteorit & Planetary Scien

117

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“…The present IR study on pure and doped KDP clearly indicates the effect of dopants [16][17][18][19] on the crystal structure of pure KDP, which leads to the change in the absorption of IR frequencies and the nonlinear optical property of both the crystals. Its deviation from pure KDP to lower frequency at 3100 cm À1 in KDP doped with amaranth and at 3350 cm À1 in KDP doped with amaranth indicated clearly the interaction of dopants with P-O-H group of KDP and in weakening the strength of the bond between oxygen and hydrogen.…”

Section: Resultsmentioning

confidence: 76%

Effect of irradiation of swift heavy ions on dyes-doped KDP crystals for laser applications

Kumaresan

Babu

Anbarasan

2008

Journal of Crystal Growth

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“…Bubble formation occurs when the concentration of implanted gas ion species is higher than the solid solubility of the ion species in the crystalline substrate, and featured by growth and agglomeration as the ion dose and substrate temperature increase [13]. The formation of the bubbles of H, He, O, N, and Ar-ion implanted sapphire has been described [2,3,13,14]. Generally, the bubbles will grow or agglomerate with increase in annealing temperature.…”

Section: Afm and Tem Resultsmentioning

confidence: 99%

“…These changes in the near-surface regions may alter physical properties of the materials in a reproducible and controllable way. There have been a number of studies on Al 2 O 3 implanted with inert gas ions [1][2][3][4][5]; however, most of them were mainly focused on the microstructures of bubbles or cavities produced in Al 2 O 3 . Since there is no chemical interaction between the inert gas ions and the Al 2 O 3 substrate, any possible change in physical properties can be ascribed to the defects in lattice induced by the ion implantation.…”

Section: Introductionmentioning

confidence: 99%