Chemistry: physical processes – Physical processes – Crystallization
Patent
1975-10-01
1976-12-28
Scovronek, Joseph
Chemistry: physical processes
Physical processes
Crystallization
73 23, 324 71SN, 338 34, G01N 2700, G01N 3300
Patent
active
039999475
ABSTRACT:
This invention provides a reducing gas sensor which has a gas sensitive element of .gamma.-ferric oxide (.gamma.-Fe.sub.2 O.sub.3), a pair of electrodes and a heater element. The .gamma.-ferric oxide is in the form of a thin film, a plate or a thin surface layer on a sintered plate of .alpha.-ferric oxide. This invention also provides a method of producing the reducing gas sensor, which includes the steps of firing .gamma.-Fe.sub.2 O.sub.3, .gamma.-FeOOH or Fe.sub.3 O.sub.4 powder on a substrate and applying thereto a pair of electrodes and a heater element; or sintering alpha-ferric oxide (.alpha.-Fe.sub.2 O.sub.3) and reducing it to magnetite and oxidizing it at the surface thereof to .gamma.-ferric oxide as a gas sensitive element. The sensitivity (R.sub.A /R.sub.G) of the gas sensitive element of .gamma.-ferric oxide is 10 to 130.degree. at 270.degree. C in an atmosphere containing 0.1 to 1 percent by volume propane gas, and the reducing gas sensor has high sensitivity and stability.
REFERENCES:
patent: 3382174 (1968-05-01), Hund
patent: 3695848 (1972-10-01), Taguchi
patent: 3843773 (1974-10-01), Pingaud
Ayusawa Masatake
Iida Yoshio
Matsumoto Keiji
Mihara Toshihiro
Sato Kunio
Matsushita Electric - Industrial Co., Ltd.
Scovronek Joseph
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