Study of interactions between oxygen and beta-alumina

Study of interactions between oxygen and beta-alumina [Pg.185]

The goal of this study is to validate the calorimetric results obtained using this same material, namely the existence of two different oxygen species on the surface, one being endothermic and the other being exothermic. [Pg.185]

In order to achieve this, our study exclusively considers the case of beta-alumina only and that of beta-alumina associated with gold or platinum. The samples here are in pulvemlent form. The metal coating was realized by cathode sputtering (200 A) of the metal on the powder. After the deposit, it appears that powder grains are only partially covered with metal. [Pg.185]

These experiments were conducted under oxygen pressure ranging from 5x10 to 4x10 Pa, and at temperatures between 50 and 400°C. [Pg.185]

While conducting the required measurements, we did not note any surface potential change on the beta-alumina, whatever the pressure and temperature conditions. This total absence of information leads us to the idea that the endothermic oxygen species we have observed in calorimetiy, if it is under the same experimental conditions, stays electrically neutral upon contact with the material. [Pg.186]

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