Quenched-in Lattice Vacancies in Copper

Re-evaluation of activities of magnesium and zinc components in the magnesium—zinc binary system from very low to high temperature

“…Also, Mg 0.154 Z 0.846 is a semi-stoichimetric intermediate phase [24]. Therefore, in the present study, the D " [27], Fe 0.75 Al 0.25 [28], Ti 0.5 Al 0.5 [29], Ni 0.75 Al 0.25 [30], Fe 0.75 Si 0.25 [27], and pure Cu [31]. The Consequently, when the symmetric atomic configuration at the stoichiometric composition was violated by the formation of vacancies, the change in relative partial molar value of lattice defects was found to be large.…”

“…[27], Fe 0.63 Al 0.37 [27], Fe 0.75 Al 0.25 [28], Ti 0.5 Al 0.5 [29], Ni 0.75 Al 0.25 [30] and Fe 0.75 Si 0.25 [27], and pure Cu [31]. The D mix G T values adopted were determined in our previous studies in which their enthalpies of mixing at 298 K, D mix H 298 , were measured by solution calorimetry and heat capacities, C p , from 2 K to 640 K measured by relaxation and scanning differential calorimetries.…”

The Solid State

“…Before discussing these investigations, the most direct technique of observing point defects should be mentioned. (43) for an initial concentration of vacancies of 10-5• The recovery of the quenched-in resistivity was almost complete at annealing temperatures of 3500 to 450°C. Vacancies were easily visible as dark areas within the exposed lattice plane.…”

Self-diffusion in platinum

“…With 99.999% pure platinum this is practically the only important activity during a time interval of about 20 days after irradiation ; later the long-lived activity of iridium becomes noticeable, the main, high cross section, impurity in platinum being iridium (Airoldi and Germagnoli 1957). This fact limits the time interval in which the tracing method can be conveniently used in the investigation of self-diffusion in platinum : it was therefore considered advisable to avoid the long diffusional annealings required by the sectioning technique and to use the quicker experimental procedure suggested by Zhukhovitsky and Geodakyan (1955).…”

“…The purity was 99.999% (Airoldi and Germagnoli 1957). After a preliminary annealing for 6 hours a t 1650°c, the average size of grains was larger than 1mm.…”