Interdiffusion coefficients of the refractory elements in Fe-Cr-X (X 1⁄4 Mo, W) and Fe-Mo-W ternary alloys were measured on the basis of the modified Boltzmann-Matano method for ternary systems. The cross interdiffusion coefficient, ~ D CrW was positive in Fe-Cr-W ternary alloy, indicating that W accelerates interdiffusion between Fe and Cr atoms. On the other hand, the cross interdiffusion coe...

The interdiffusion coefficients in bcc ( ) and fcc ( ) Fe-Ni alloys below their Curie temperatures have been calculated based on the magnetic contribution to the free energy for interdiffusion. The free energy for interdiffusion due to magnetic ordering in bcc Fe-Ni alloys is positive. The calculated interdiffusion coefficients in bcc Fe-Ni alloys fit the experimental data quite well. In fcc Fe...

High-throughput measurement using the numerical inverse method combined with the diffusion multiple technique was employed to determine the composition-dependent interdiffusion coefficients in fcc Al–Co–Cr–Fe–Ni high-entropy alloys at 1273, 1323, and 1373 K. The reliability of the obtained interdiffusion coefficients was confirmed by comparing the model-predicted composition/interdiffusion flux...

A series of organic photovoltaic devices consisting of concentration gradients of poly (3-octylthiophene) (P3OT) and [6,6]-phenyl-C61 butyric acid methyl ester (PCBM) were fabricated by thermally-induced interdiffusion of consecutively spin-cast layers of P3OT and PCBM from solvents of chloroform and pyridine, respectively. The device performance was evaluated as a function of the layer thickne...

We compare the experimental interdiffusion constants DAlCu in liquid Al81.3Cu18.7 at% to the experimental Cu self diffusion constants DCu in a similar Al80Cu20 at% melt. DAlCu are measured by an X-ray radiography technique and DCu are measured by the quasielastic neutron scattering method. It was found that DAlCu is enhanced by a factor of 3 with respect to DCu. The relation between DAlCu and D...

We demonstrate a sharp composition transition at the interface of an as-deposited SmCo5/Fe bilayer, while annealing results in measurable Co/Fe interdiffusion near the boundary. For the annealed SmCo5/Fe bilayer, phase separation occurs within the bcc-layer, forming regions with 3 different Fe:Co ratios. Depositing Fe between Sm-Co layers provides a realistic model for bulk systems. Co/ Fe inte...

Interdiffusion and interdiffusion COntrGlied intermediate phase formation in metal matrix composites can be of interest for the prolonged application of these systems at high temperatures. Methods are discussed that address the kinetics of interdiffusion in systems that exhibit solid solution intermixing or the formation of a third intermediate phase at the fiber/matrix interface, or both. The ...

The interdiffusion effects on the band alignment of the GeSi dots embedded in Si matrix were studied by temperatureand excitation-power-dependent photoluminescence measurements. A different power-dependent behavior of the photoluminescence for the as-grown and the annealed samples was observed. It was suggested that the band alignments of the dots changed from type II to type I after annealing ...

1. Introduction Chemical diffusion (also named interdiffusion), originating from the fluctuations among different elements, is a common phenomenon in multicomponent liquid metals. The interdiffusion coefficients in liquid alloys control the liquid-solid transformation and are thus basic parameters for materials design from the melt. In this work, a novel X-ray radiography (XRR) technique (Fig.1...

A new application of infrared ellipsometry is reported. Specifically, the interdiffusion between thin films of miscible polymers (poly(methyl methacrylate) and poly(vinylidene fluoride)) is detected in a non-invasive measurement. A novel technique of data analysis for interdiffusion was developed and is described. The validity of the approach is supported by simulations of diffusion in a bilaye...