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Mehrer, H.; Stolica, N.; Stolwijk, N. A.

doi:10.1007/10390457_27

Cited by 2 publications

(4 citation statements)

References 84 publications

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“…The application of this method to divacancies failed because of numerical problems (too big matrices, bad convergence). For our calculations we used the "Monte-Carlo-method", a computer simulation of the vacancy migration in the lattice similar to that used by Mehrer [16]. From the eight or twelve possible jump vectors to the nearest-neighbour positions in the crystal the computer selects one in a random manner by using a random-number generator.…”

Section: Numerical Methods and Resultsmentioning

confidence: 99%

The Contribution of Magnetic Dipolar Interactions to Nuclear Spin Relaxation by Vacancy‐Type Self‐Diffusion Mechanisms in Metals

Cavelius

1974

Physica Status Solidi (b)

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The spectral densities determining the dipolar contribution to the nuclear spin relaxation times are calculated for a combined monovacancy-divacancy mechanism of self-diffusion in solids. The treatment is based on Wolf's encounter model for monovacancies and isotopically pure crystals. Numerical results are given for isotopically pure f.c.c. and b.c.c. crystals. The extension t o more than one spin species is indicated.Die fur den dipolaren Beitrag zu den Kernspinrelaxationszeiten maDgebenden Spektraldichten werden fur einen kombinierten Einfach-Doppelleerstellen-Mechanismus der Selbstdiffusion in Festkorpern berechnet. Die Behandlung basiert auf dem Wolfschen Begegnungsmodell fur Einfachleerstellen in isotopenreinen Kristallen. Numerische Ergebnisse werden fur isotopenreine k.f.z.-und k.r.z.-Kristalle angegeben. Es wird gezeigt, wie man das Vorhandensein von mehr als einer Spinsorte berucksichtigen kann.

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Section: Numerical Methods and Resultsmentioning

confidence: 99%

The Contribution of Magnetic Dipolar Interactions to Nuclear Spin Relaxation by Vacancy‐Type Self‐Diffusion Mechanisms in Metals

Cavelius

1974

Physica Status Solidi (b)

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“…11) The extension of these measurements to temperatures as low as 515 K 11,12) allowed H SD 1V to be determined quite accurately, giving us…”

Section: Comparison With Self-diffusion Datamentioning

confidence: 97%

“…, according to eqs (12) and (15) we have H (1) The scattering cross section of a divacancy for conduction electrons, averaged over all possible orientations, is smaller than that of two independently scattering monovacancies. Hence we expect the specific resistivity of divacancies, ρ 2V , to be less than that of two isolated monovacancies, 2ρ 1V .…”

Section: Divacanciesmentioning

confidence: 99%

“…On several fcc metals, the right-hand side of eq. (1) has been determined quite accurately by careful analysis of self-diffusivity measurements over a wide temperature range, using radioactive tracers, or, as in the case of Al, 11,12) nuclear magnetic resonance (NMR) techniques. Here two circumstances were helpful: (1) Diffusivity measurements are insensitive against the interaction of the diffusion vehicles (i.e.…”

Section: Introduction and General Backgroundmentioning

confidence: 99%

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Quenching Studies of Lattice Vacancies in High-Purity Aluminium

2002

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The experimental techniques for obtaining reliable enthalpies of formation and migration of vacancies in pure metals and the importance of achieving high accuracy are critically discussed, with emphasis on studies based on the quenching-in of 'thermal' vacancies. From measurements of the residual electrical resistance introduced into high-purity Al foils (thickness 0.1 mm) by ultrafast quenches (initial quenching rate ≈ 2 × 10 6 K s −1 ) from temperatures T between 800 K and 530 K and the literature data on high-temperature differential dilatometry, the enthalpy,

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Figures for 2

Cited by 2 publications

References 84 publications

The Contribution of Magnetic Dipolar Interactions to Nuclear Spin Relaxation by Vacancy‐Type Self‐Diffusion Mechanisms in Metals

The Contribution of Magnetic Dipolar Interactions to Nuclear Spin Relaxation by Vacancy‐Type Self‐Diffusion Mechanisms in Metals

Quenching Studies of Lattice Vacancies in High-Purity Aluminium

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