Chemical kinetics of phase boundaries in solids

Abstract

The kinetics of solid/solid interfaces is of major importance for the course of heterogeneous reactions in the solid state. Solid/solid interfaces are normally sources of elastic stress and thus may interact with outer surfaces. In addition, they can offer high diffusivity paths and thus represent two‐dimensional reaction media. Essential kinetic situations are defined and basic formal considerations are summarized. Corresponding experimental examples are presented in order to illustrate kinetic phenomena at static and moving boundaries. This includes questions of exchange fluxes, boundary‐controlled solid state reactions, morphology, nonlinear phenomena and reactions in boundaries.

Oscillatory kinetics at solid/solid phase boundaries in ionic crystals

“…In conclusion, we have to expect other feedback 2 mechanisms in solid-state kinetics than in fluid-phase ancies proceeds by bulk diffusion into the metal kinetics. At coherent and semicoherent boundaries electrode, we estimate an anodic limiting current we expect an influence of elastic effects, and we density of a silver electrode of approximately 50 2 have to take the motion of dislocations and their mA/cm at T 5 8008C [6]. Typical current densities interaction with point defects into account.…”

“…We distinguish resting transfer, is the possibility of both structural and and moving boundaries. At resting boundaries, at morphological changes within the boundary region, least one of the two neighboring lattices remains driven by the transfer process itself [1,6]. The intact and the transfer of ions does not lead to a shift present paper focusses on these reactive aspects of of the boundary itself, i.e.…”

“…It mer equation) are transferred without serious discusis of basic interest for the understanding of solidsion. Despite an increasing number of experimental state kinetics [5,6]. An increasing number of theoretstudies, the corresponding knowledge is yet still ical and experimental studies, mainly driven by restricted, due to many experimental problems.…”

Solid-State Electrolysis in CuBr Thin Films: Observation and Modelling of Fractal Growth

“…Ionic transfer fluxes at ionic conductor/ parent metal interfaces were discussed by Schmalzried and Janek. [17] In the case of ™reversible∫ electrodes, the overvoltage for copper dissolution/deposition may be negligible.…”

The structure of Mg2SnO4/MgO topotaxial reaction fronts during gas–solid and solid–solid reactions

“…Structure and morphology of the interfaces (reaction fronts) therefore decisively determine important characteristics of the reaction as, e.g. product orientation, reaction mechanisms, or reaction kinetics [5,6]. The atomic-scale structure of the reaction front, however, depends on the crystallographic conditions under which the reaction proceeds, particularly on the sign and amount of the lattice mis®t at the reaction front [7].…”