Exhaust gas sensor and process for producing same

Details Exhaust gas sensor and process for producing same Exhaust gas sensor and process for producing same

1989-03-15

1991-12-03

Reynolds, Bruce A.

Electrical resistors

Resistance value responsive to a condition

Gas, vapor, or moisture absorbing or collecting

H01C 700

Patent

active

050703188

ABSTRACT:
An exhaust gas sensor containing BaSnO.sub.3 or the like and a process for producing the sensor. The BaSnO.sub.3 is made free of segregation and adapted to have acid-base strength of at least 6.8 as determined with Hammett's indicator. Causes to reduce the acid-base strength of the BaSnO.sub.3 includes presence of Si and B, and causes to increase the acid-base strength include addition of Mg or Ca. The desired BaSnO.sub.3 can be prepared by precipitating BaSnO.sub.3 hydrous crystals while preventing introduction of Si and B thereinto especially with use of a container lined with a synthetic resin to prevent introduction of Si and B from the container, adding Mg or Ca to the precipitate, and thermally decomposing the precipitate.

REFERENCES:
patent: 4701739 (1987-10-01), Sasaki
patent: 4816800 (1989-03-01), Onaga et al.
patent: 4911914 (1990-03-01), Satake et al.
Proceedings of 2nd Int. Meetings on Chemical Sensors, Bordeaux 1986 1-08 (pp. 138-141) Shimuzu et al.
Proceedings of 2nd Int. Meetings on Chemical Sensors, Bordeaux 1986 1-09 (pp. 142-145) Arai et al.

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