Solid electrolyte for oxygen sensor

Details Solid electrolyte for oxygen sensor Solid electrolyte for oxygen sensor

1987-03-26

1988-06-07

Niebling, John F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204427, 429 30, 429 33, 501103, 501104, 501105, G01N 2726

Patent

active

047494662

ABSTRACT:
The invention is based on the discovery that in a solid electrolyte galvanic sensor, e.g. an yttria-stablized zirconia body, it is not necessary, as has hitherto been believed, to eliminate all impurities to achieve the important performance characteristics of rapid response time, reduced susceptibility to aging, and improved reliability. It has now been found that these improvements can be obtained by reducing only the concentration of iron oxide (and any other variable valence oxides that sometimes occur) in the sample, and that it is unnecessary to lower the concentration of oxides of fixed valence elements, such as silicon, aluminum, magnesium, and the alkali and alkaline earth metals, many of which tend to occur frequently as impurities in ceramic materials. This inventive selective elimination of only the variable valence oxides saves substantial cost in manufacture without loss of the performance advantages mentioned above. Indeed, better mechanical properties are often obtained. In a specific example the invention provides a solid electrolyte in which the concentration of iron oxide, expressed as Fe.sub.2 O.sub.3, and oxides of other variable valence elements, is less than 0.02 percent by weight, while the concentration of fixed valence oxides remains at least 0.5 percent by weight.

REFERENCES:
patent: 3347767 (1967-10-01), Hickam
patent: 4505806 (1985-03-01), Yamada
patent: 4626517 (1986-12-01), Watanabe et al.
Viking Ceramics of 4591 Follenslev, Denmark.
Heyne and den Engelsen; J. Electrochemical Society, 124, 727-735, 1977.

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