Chemistry: physical processes – Physical processes – Crystallization
Patent
1973-07-05
1976-04-20
Wolk, Morris O.
Chemistry: physical processes
Physical processes
Crystallization
338 34, 23254E, 73 27R, G01N 2704, H01C 1300
Patent
active
039516032
ABSTRACT:
A gas-sensor element for detecting reducing gases and vapors such as alcohols or carbon monoxide, or for determining oxygen concentration, which is characterized by comprising a complex metal oxide having a perovskite-type crystal structure and represented by the general formula A.sub.1.sub.-x A'.sub.x BO.sub.3.sub.- .sub..delta., wherein A is at least one element selected from the group consisting of rare earth elements of the atomic numbers from 57 to 71, yttrium, and hafnium, A' is at least one element selected from the group consisting of alkaline earth metals and lithium, B is at least one element selected from the group consisting of transition metals of the atomic numbers from 21 to 30, O is oxygen, x is in the range of 0 .ltoreq. x .ltoreq. 1, and .delta. is a nonstoichiometric parameter.
REFERENCES:
patent: 3609732 (1971-09-01), Kasahara et al.
patent: 3625756 (1971-12-01), Taguchi
patent: 3644147 (1972-02-01), Young
patent: 3695848 (1972-10-01), Taguchi
patent: 3732519 (1973-05-01), Taguchi
patent: 3793605 (1974-02-01), Fehlner
Galasso, Structure Properties and Preparation of Perovskite-Type Compounds, Pergamon Press, N.Y. (1970), pp. 60-73.
Gejyo Tetsuo
Obayashi Hidehito
Hagan Timothy W.
Hitachi , Ltd.
Wolk Morris O.
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