Oxygen Diffusion in Strontium Titanate Studied by Solid/Gas Isotope Exchange
The method of heterogeneous isotope exchange has been frequently used to study oxygen diffusion in oxide crystals in view of lattice disorder, electrical properties or solid state reactions. In principle, the oxide crystal of known geometry is exposed to a constant amount of gas of a certain oxygen partial pressure at a given temperature. Initially the oxygen -18 concentration is different in both phases. The kinetics of exchange is then followed by measuring mass spectrometically the isotope content of the gas as a function of time without necessarily determining the concentration profile in the solid.
KeywordsDiffusion Coefficient Oxygen Diffusion Isotope Exchange Bulk Diffusion Strontium Titanate
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