Potential Measurements on a Si,SiO[sub 2] Electrode Using a ThO[sub 2]-Y[sub 2]O[sub 3] Electrolyte

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Abstract
A series of emf vs. temperature measurements were made on the cell in order to establish the ionic range of at very low oxygen activities. The use of platinum between the disks extended the useful life of the cell. In the temperature range 600°– 1000°C the emf falls progressively below the expected thermodynamic value with increasing temperature. These data were found to be reproducible in several different cell configurations. The apparent ionic transference number, , at the Si, electrode is given by where is the partial pressure of oxygen, is the absolute temperature, and is the gas constant. The fall off in emf from the thermodynamic value is not predictable from measurements of the ionic range of reported by other workers. Some possible factors responsible for the fall off in emf from the thermodynamic value are discussed.

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