Self‐Diffusion in α‐Silver‐Cadmium

Gardner, A. B.; Sanders, Rebecca L.; Slifkin, Lawrence

doi:10.1002/pssb.19680300111

Cited by 17 publications

(8 citation statements)

References 3 publications

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“…For these systems accurate diffusion data is available for the diffusion of both atomic species in the alloys [3]. More recently further diffusion measurements have been published on alloys of the silver-cadmium system a t higher cadmium concentrations [4]. Previous Zener relaxation work on the silver-cadmium [5 t o 81 and silver-indium [9, 101 systems are in some respects different to the present work.…”

Section: Introductionmentioning

confidence: 74%

“…The relaxation activation energy versus composition curve is approximately parallel to the diffusion curves up to about 25 a t yo cadmium; above this concentration the curves separate. Gardner et al [4] offer two explanations for this effect in terms of the onset of short range order on long range diffusion. Firstly they suggest that a substantial change in the extent of short range order over the temperature range of diffusion measurements would result in an additional contribution to the activation energy.…”

Section: -mentioning

confidence: 99%

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The Zener Relaxation in Silver—Cadmium and Silver—Indium Solid Solutions

Mills

1971

Phys. Stat. Sol. (a)

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The Zener relaxation has been studied in a number of alloys of the silver—cadmium and silver—indium systems. The temperature dependence of the relaxation time (τr) for four alloys is described by the equations: The present work on silver—indium alloys suggests that the relaxation is controlled by diffusion of silver at low concentrations of indium, whilst at high indium concentrations the relaxation may be controlled by diffusion of indium. In addition to measurements described by the above equations the relaxation strength, Δm, of Ag3.65 at% indium and Ag18.95 at% indium alloys was measured. The composition dependence of Δm did not obey a c2 (1 − c)2 relation; it is suggested that a change in the rate controlling process of the relaxation at high indium concentrations accounts for this behaviour. For the Ag39 at% cadmium alloy a large difference between the relaxation and diffusion activation energies of either species in the alloy was measured.

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Section: Introductionmentioning

confidence: 74%

Section: -mentioning

confidence: 99%

The Zener Relaxation in Silver—Cadmium and Silver—Indium Solid Solutions

Mills

1971

Phys. Stat. Sol. (a)

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“…Near the phase boundary, however, there is a noticeable difference between the two of a magnitude barely within the uncertainty of the extrapolation of the diffusion data. The possibility that this discrepancy at high solute concentrations, if real, arises from the temperature dependence of short range order, is discussed in the preceeding paper by Gardner et al [8].…”

Section: Discussionmentioning

confidence: 99%

Activation Energies for Zener Relaxation in α‐AgCd

Turner

Dozier

Williams

1968

Physica Status Solidi (b)

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Activation energies for Zener relaxation have been measured from 15.0 to 39.6aty0 Cd in Ag with a torsion pendulum, and compared with recent diffusion data over the same range of concentrations. Over most of the range the relaxation energies are approximately 1.5 kcal/mol less than the energy of the faster diffuser; as the solubility limit is approached, however, this energy difference increases. As in earlier work, the relaxation times are approximately equal to the extrapolated mean times of stay of the faster diffuser, indicating that Zener relaxation measures the diffusion of the more mobile component of the solid solution.Mit einem Torsionspendel wurden die Aktivierungsenergien fur Zener-Relaxation in einem Bereich von 15,O bis 39,6 Atyo Cd in Ag gemessen und mit den Ergebnissen aus Diffusionsmessungen uber den gleichen Konzentrationsbereich verglichen. ttber den groBten Teil des Bereiches sind die Relaxationsenergien etwa 1,5 kcal/Mol kleiner als die Energie der schneller diffundierenden Atome. Dieser Energieunterschied steigt jedoch an, sobald man sich der Loslichkeitsgrenze niihert. Ebenso wie in friiheren Arbeiten sind die Relaxationszeiten niiherungsweise gleich den extrapolierten mittleren Verweilzeiten der schneller diffundierenden Atome. Dieses deutet darauf hin, daI3 durch die Zener-Relaxation die Diffusion der beweglicheren Komponente in der ,,Losung" gemessen wird.

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“…Third, the high vapor (9) pressure of cadmium in contrast to the negligible vapor pressure of silver satisfies the requirement for assembling vapor-solid diffusion couples. (10) Finally, there exist considerable tracer diffusivity and thermody- (11,12) namic data in the literature for the Ag-Cd system. Ji = -9:3 C B 6 + n NiB:…”

Section: Introductionmentioning

confidence: 99%