Multiphase diffusion in binary and ternary solid-state systems

Microstructure, Diffusion and Growth Mechanism of Nb3Sn Superconductor by Bronze Technique

“…It should be noted that interdiffusion study with this geometry is rather complicated compared to the interdiffusion process in a specimen with planar interface. It is also not possible to use the laws developed for planar interface directly in the experimental results that are achieved from the experiments with cylindrical geometry, since the growth rate in this condition does not follow the same relation (van Loo, 1990). In a diffusion couple with planar interface, interfacial area does not change.…”

“…Growth rate with planar interface will follow parabolic law in the case of diffusion controlled process; however, it will deviate in the case of growth in a sample with cylindrical geometry (van Loo, 1990).…”

The $$\upalpha +\upvarepsilon $$ Two-Phase Equilibrium in the Fe-N-C System: Experimental Investigations and Thermodynamic Calculations

“…However, it can be assumed [12] that at each depth below the surface local equilibrium with respect to the local, lateral gross composition, the temperature, and the pressure is established, especially at the interfaces between the Fe-N-C solid-solution phases, i.e., the sublayer boundaries and the interface with the substrate. The phase constitution as a function of depth can be predicted using the concept of diffusion paths: [13][14][15][16] the evolution of the (laterally averaged) composition as a function of depth allows to plot these composition data in a phase diagram at the temperature (and pressure) concerned, which data together constitute the diffusion path. If local equilibrium at each point of the diffusion path and thus at each depth in the specimen separately prevails, the sequence of the phases developing within the compound layer and the diffusion path can be related with the corresponding phase diagram, [13][14][15] e.g., see Reference 12.…”

Reactions in the systems MoSi3N4 and NiSi3N4

“…Qualitative knowledge, in the sense of knowing the sequence !n diffusion rate of the elements in these phases, is often enough to predict the product sequence and morphology in a diffusion couple [2][3][4]. It can also be seen from the magnified A-corner of the isotherm in Fig.…”

“…In the system Ni-AI203 situations like the one depicted in Fig. l(a, c) have actually been found [4,5].…”