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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 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

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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