Diffusionsuntersuchungen im System Palladium—Vanadium mit Hilfe der Mikrosonde / Diffusion In The System Pd—V Investigated By Means Of An Electron Microprobe

Abstract

Diffusion processes (600 to 1300 °C) were investigated by means of quantitative electron-probe-microanalysis. The composition of the diffusion zone corresponds quite well with the phase diagram. The following phases were observed: Pd-solid solubility, Pd₃V, Pd₂V, and V-solid solubility. Below 900 °C the growth of the diffusion zone is retarded; above 900 °C the layer grows according to d = k ·√t. For all phases observed, according to Matano's method the coefficients of the inter-diffusion were determined. The temperature dependency of these coefficients as well as that of the k-values follows an Arrhenius law. Thus the activation energies of the layer growth and of the interdiffusion were obtained. The determination of the intrinsic diffusion coefficients by the observation of the Kirkendall-effect is discussed.