Abstract
Mixture of 18O2 and 16O2 gases was used as a tracer in oxygen diffusion experiment of solid (Y-TZP) in which the concentration of 18O in the gas phase was determined directly by a mass spectrometer. If a simple mixture of these gases was used, the formation reaction of 18O16O gas had an effect on the concentration determination, especially when the diffusion time was short. In order to go around the effect, it was essential to use a gas mixture in which oxygen isotope exchange reaction (formation reaction of 18O16O gas) was in equilibrium at the diffusion temperature.
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