GB1424398A - Detection of specific substances in various atmospheres - Google Patents
Detection of specific substances in various atmospheresInfo
- Publication number
- GB1424398A GB1424398A GB3045373A GB3045373A GB1424398A GB 1424398 A GB1424398 A GB 1424398A GB 3045373 A GB3045373 A GB 3045373A GB 3045373 A GB3045373 A GB 3045373A GB 1424398 A GB1424398 A GB 1424398A
- Authority
- GB
- United Kingdom
- Prior art keywords
- depletion layer
- oxide
- halide
- substituting
- terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
1424398 Detecting gases electrically INFICON Inc 27 June 1973 30453/73 Heading GIN Halogen containing gases are detected using a sensor comprising a semi-conducting glass-ceramic body derived from a mixture comprising sodium or lithium silicate and a metal oxide and/or halide. A glass-ceramic body 11 e.g. sodium silicate, lanthanum oxide, and lanthanum fluoride is formed round platinum wire 14 and a second platinum wire 16 is wrapped round the body 11. A voltage from battery 20 is applied across wires 14, 16 and the body is heated to a temperature above 500‹C to form a depletion layer 17 caused by the migration of the alkali metal ions from terminal 16 to terminal 14. Due to the small number of carriers in the surface region the depletion layer provides a high resistance region at the surface and the conduction indicated at 22 becomes very small. In the presence of a halogen containing gas the negative ions of this gas will accumulate on the depletion layer and cause some of the alkali metal ions to migrate back to the depletion layer so that the carrier concentration in the depletion layer increases with resulting increase in current flow through meter 22. Alternative compositions are:- substituting lithium silicate for sodium silicate, or by substituting the lanthanium oxide or lanthanum fluoride with an oxide or halide of scandium, yttrium, aluminium, gallium or other rare earth metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3045373A GB1424398A (en) | 1973-06-27 | 1973-06-27 | Detection of specific substances in various atmospheres |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3045373A GB1424398A (en) | 1973-06-27 | 1973-06-27 | Detection of specific substances in various atmospheres |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1424398A true GB1424398A (en) | 1976-02-11 |
Family
ID=10307936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3045373A Expired GB1424398A (en) | 1973-06-27 | 1973-06-27 | Detection of specific substances in various atmospheres |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1424398A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2165054A (en) * | 1984-09-26 | 1986-04-03 | Atomic Energy Authority Uk | Gas sensors |
| EP0774661A1 (en) * | 1995-11-17 | 1997-05-21 | Siemens Aktiengesellschaft | Sensor for halogens or hydrogen halides |
| EP0827941A1 (en) * | 1996-09-05 | 1998-03-11 | Ivoclar Ag | Sinterable lithium disilicate glass-ceramics |
| US5968856A (en) * | 1996-09-05 | 1999-10-19 | Ivoclar Ag | Sinterable lithium disilicate glass ceramic |
-
1973
- 1973-06-27 GB GB3045373A patent/GB1424398A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2165054A (en) * | 1984-09-26 | 1986-04-03 | Atomic Energy Authority Uk | Gas sensors |
| EP0774661A1 (en) * | 1995-11-17 | 1997-05-21 | Siemens Aktiengesellschaft | Sensor for halogens or hydrogen halides |
| EP0827941A1 (en) * | 1996-09-05 | 1998-03-11 | Ivoclar Ag | Sinterable lithium disilicate glass-ceramics |
| US5968856A (en) * | 1996-09-05 | 1999-10-19 | Ivoclar Ag | Sinterable lithium disilicate glass ceramic |
| US6342458B1 (en) | 1996-09-05 | 2002-01-29 | Ivoclar Ag | Lithium disilicate glass ceramics dental product |
| US6514893B1 (en) | 1996-09-05 | 2003-02-04 | Ivoclar Ag | Sinterable lithium disilicate glass ceramic |
| US6606884B2 (en) | 1996-09-05 | 2003-08-19 | Ivoclar Ag | Sinterable lithium disilicate glass ceramic |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |