EP0055104A2
Expired / Lapsed
EP
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Sensor element and method for fabricating same
Assignee: Panasonic Holdings Corp
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Filing: 1981-12-18
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Granted: —
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Expires: 2001-12-18
Abstract
Abstract A sensor element (10) comprises a substrate (11) and a part of electrodes (12) electrically connected thereto, the substrate (11) being made of a compound oxide of the perovskite type having the formula A 1-x A' x B 1-y B' y O 3 in which A represents at least one element selected from La, Ce, Pr and Nd, A' represents at least one element selected from Ca, Sr and Ba, B represents Co, B' represents at least one element selected from Fe, Mn, V and Ti, x is a value ranging from 0.6 to 0.95 and y is a value ranging from 0.2 to 0.9 provided that x - ½ (1 +y). A method for fabricating the sensor element is also described.
Inventors
- 👤 Satoshi Sekido
- 👤 Hirokazu Tachibana
- 👤 Yoshito Ninomiya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 08:29
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
A sensor element which comprises a porous substrate made of a compound oxide of the perovskite type and a pair of electrodes electrically connected to said substrate and spaced apart from each other, characterised in that the compound oxide has the formula A 1-x A' x B 1-y B' y O 3 inwhich A represents at least one lanthanide element selected from La, Ce, Pr and Nd, A' represents at least one element selected from Ca, Sr and Ba, B represents Co, B' represents at least one element selected from Fe, Mn, V and Ti, x is a value ranging from 0.6 to 0.95 and y is a value ranging from 0.2 to 0.9 provided that x = % (1+y).
Claim 2
Dependent Claim
120 words
A sensor element which comprises a porous substrate made of a compound oxide of the perovskite type and a pair of electrodes electrically connected to said substrate and spaced apart from each other, characterised in that the compound oxide has the formula A 1-x A' x B 1-y B' y O 3 inwhich A represents at least one lanthanide element selected from La, Ce, Pr and Nd, A' represents at least one element selected from Ca, Sr and Ba, B represents Co, B' represents at least one element selected from Fe, Mn, V and Ti, x is a value ranging from 0.6 to 0.95 and y is a value ranging from 0.2 to 0.9 provided that x = % (1+y).
Claim 3
Dependent Claim
19 words
A sensor element according to claim 1, wherein the element A is La and the element A' is Sr.
Claim 4
Dependent Claim
50 words
A sensor element according to claim 1 or 2, wherein y is in the range of 0.2 to 0.4 when said sensor is used in an atmosphere rich in CO gas and y is 0.9 when said sensor is used in an atmosphere rich in hydrocarbons or H 2. .
Claim 5
Dependent Claim
27 words
A sensor element according to claim 1, 2 or 3, wherein the electrodes are each made of an alloy of Pt or Pd and Ag or Cu.
Claim 6
Dependent Claim
42 words
A sensor according to any one of the preceding claims when connected in series to a power circuit together with an actuator solenoid whereby said actuator solenoid can be worked in response to an abrupt variation in resistance of said sensor element.
Claim 7
Independent Claim
122 words
A method for fabricating a sensor element as claimed in any one of claims 1 to 4 which comprises mixing an aqueous solution of the elements A,A'B and B' each in the form of a water-soluble salt except that an oxide powder is used when V and/or Ti is used as the element B', thermally decomposing the water-soluble salts, heating the decomposition products at a temperature of 850 to 950°C to give a powder of a compound oxide of the perovskite type, adding to said powder 20 to 40% by weight methyl cellulose based on the powder, drying the mixture to a predetermined moisture content, press-molding the mixture in a given form, and sintering the resulting molding at a temperature below 1200°C.
Claim 8
Dependent Claim
19 words
A method according to claim 6, wherein said methyl cellulose is used in the form of an aqueous solution.
References Cited (Backward Citations)
No citation records indexed.
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