Chemistry: physical processes – Physical processes – Crystallization
Patent
1973-07-05
1976-04-27
Wolk, Morris O.
Chemistry: physical processes
Physical processes
Crystallization
23254E, 338 34, 73 27R, G01N 2704, H01C 1300
Patent
active
039531732
ABSTRACT:
A gas-sensor element for detecting oxidizable gases and vapors such as alcohols for carbon monoxide, which is characterized by comprising a complex metal oxide having the K.sub.2 MgF.sub.4 -type crystal structure and represented by the general formula A.sub.2-x A'.sub.x BO.sub.4-.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 elements of the atomic numbers from 21 to 30, 0 is oxygen, x is in the range of 0.ltoreq.x.ltoreq.2, and .delta. is a nonstoichiometric parameter.
REFERENCES:
patent: 3609732 (1971-09-01), Kashara
patent: 3625756 (1971-12-01), Taguchi
patent: 3695848 (1972-10-01), Taguchi
patent: 3732519 (1973-05-01), Taguchi
patent: 3793605 (1974-02-01), Fehlner
Chem. Abstracts, Vol. 74: 35695K (1971).
Chem. Abstracts, Vol. 70: 62070d (1969).
Chem. Abstracts, Vol. 65: 6697f (1966).
J. Inorg. Nucl. Chem., Vol. 27, pp. 2683-2684 (1965).
Gejyo Tetsuo
Kudo Tetsuichi
Obayashi Hidehito
Hagan Timothy W.
Hitachi , Ltd.
Wolk Morris O.
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