ZIB

Digitale Medien

Diffusion of Al in ion-implanted Pd and Pt (1984)

Lappalainen, R. ; Anttila, A.

Springer

Applied physics 35 (1984), S. 131-134

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ISSN: 1432-0630

Schlagwort(e): 66.30.Jt ; 61.70.Tm

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract The diffusion coefficients of aluminium have been measured in polycrystalline fcc Pd and Pt. The Al-implanted palladium and platinum samples were annealed at 400°–800 °C and 450°–900 °C, respectively. The aluminium profiles were probed using the nuclear resonance broadening (NRB) technique. Values of (1.41±0.09) and (1.38±0.09) eV for the activation energy and (1.5 −1.0 +5 )×10−6 and (4 −3 +10 )×10−7cm2/s for the frequency factor were obtained for Al in Pd and Pt, respectively. These anomalous results, compared to the “normal impurity diffusion”, were checked using also Al-evaporated samples.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00616964

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Digitale Medien

Diffusion of nitrogen in vanadium and niobium (1984)

Keinonen, J. ; Räisänen, J. ; Anttila, A.

Springer

Applied physics 34 (1984), S. 49-56

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ISSN: 1432-0630

Schlagwort(e): 66.30. Jt ; 61.70. Tm

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract The diffusion of N in the group VB metals V and Nb has been studied in the previously uninvestigated temperature range 300–500 °C using ion-beam techniques. Diffusion couples were created by ion implantation. The time-dependent diffusion profiles were monitored by the use of the Nuclear Resonance Broadening (NRB) technique. New values for the solubility of N in Nb were obtained. The diffusion rates presented support recent observations of the diffusivity of interstitial impurities in body-centered cubic metals in which positive deviations from Arrhenius behaviour have been seen at high temperatures.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00617574

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Digitale Medien

Radiation enhanced outdiffusion during ion implantation (1979)

Anttila, A. ; Hautala, M.

Springer

Applied physics 19 (1979), S. 199-203

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ISSN: 1432-0630

Schlagwort(e): 61.70T ; 61.80J

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract For a systematic prediction of the radiation-enhanced outdiffusion occurring during implantation, the use of a model based on the effect of vacancy flow on diffusion is described. The model agrees reasonably well with experiments in all twentysix measured cases. For the systematic understanding of the radiation enhanced outdiffusion, an approximative diagram based on the activation energy of self-diffusion is constructed for all pure elements and its application possibilities are discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00932398

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Digitale Medien

Diffusion of nitrogen in ion-implanted chromium and tungsten (1984)

Keinonen, J. ; Räisänen, J. ; Anttila, A.

Springer

Applied physics 35 (1984), S. 227-232

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ISSN: 1432-0630

Schlagwort(e): 66.30. Jt ; 61.70. Tm

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract The diffusion of N in the group VI B metals Cr and W has been studied in the previously uninvestigated temperature ranges 300°–550 °C (Cr) and 600°–800 °C (W) using ion-beam techniques. Diffusion couples were created by ion-implantation. The timedependent diffusion profiles were monitored by the use of the Nuclear Resonance Broadening (NRB) technique. The linear Arrhenius plots extracted from the measured diffusivities indicate that the diffusivity of implanted N in Cr and W can be described by the activation energyQ=1.39±0.06 eV and 2.32±0.16 eV and the pre-exponential factorD 0=(7.0±7.2)×10−4cm2/s and 4.3±8.3cm2/s, respectively. The solubilities of N in Cr and W from the implanted distributions were found to deviate from those obtained using conventional metallographical methods.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00617172

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Digitale Medien

DSA lifetimes in21Na and23Na derived from experimental stopping parameters (1975)

Anttila, A. ; Bister, M. ; Keinonen, J.

Springer

The European physical journal 274 (1975), S. 227-232

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ISSN: 1434-601X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The lifetimes for the second excited state in21Na and for the second to ninth excited states in23Na have been determined with the DSA method using Ta2O5 and Ta as stopping materials. In the DSA analysis the experimental stopping parameters determined in the present and earlier works were utilized. The reanalysis of some earlier studies has brought very good consistency to the scattered results. Comparison of the observed transition strengths with theory has also been made.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01437734

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