A comparison between microsectioning studies of low-temperature self-diffusion in silver

Abstract

A comparison is made between various microsectioning techniques for radiotracer studies of self‐diffusion in silver. Previous investigations by various groups were made with the help of chemical and electrochemical microsectioning techniques. In the present work ion‐beam sputtering is applied to the sectioning of silver. Over the temperature range investigated (580 to 834 K) the self‐diffusion coefficients (2 × 10−17 to 9 × 10−13 cm2 s−1) fit the Arrhenius equation D = 0.043 exp (–1.76 eV/kT) cm2 s−1. A comparison between our results and those of previous measurements indicates that the diffusion coefficients of the more recent electrochemical and chemical microsectioning investigations are fully compatible. On the other hand, the pioneering work on chemical and electrochemical microsectioning studies of silver self‐diffusion is probably in error, due to unsuspected difficulties of the sectioning techniques.

Effect of the Ag evolution process on ordering the transition for L10-FePt nanoparticles synthesized by Ag addition

“…At 360 1C, D Ag = 3.4 Â 10 À16 cm 2 s À1 and D Fe = 5.5 Â 10 À18 cm 2 s À1 . 41,42 In addition, the Arrhenius law has been proposed to describe the temperature dependence of the diffusivity D n defined as D n = D 0 exp(ÀQ/k B T), where T and k B are the temperature (K) and the Boltzmann constant (1.38 Â 10 À23 J K À1 ), respectively, and D 0 and Q are constants; D 0 is generally named as the diffusion preexponential factor, and Q is referred the diffusion activation energy of atoms. The low diffusivity D Pt of Pt atoms can be estimated from the Empirical Formula, which can be written as D Pt = 0.05exp(À2.67/k B T).…”