Sensor material and gas sensor element and gas sensor derived therefrom
View Patent ↗A NO X sensor material includes a composition of Ba (1-X) A X Fe (12-Y) B Y O 19 . Constituent A and constituent B are doping elements. Constituent A is selected from the group consisting of Bi, La and Pb and X is a real number where 0≦X<1. Constituent B is selected from the group consisting of Al, B, Bi, Ca, Co, Cr, Cu, Er, Ga, In, Mg, Mn, Ni, Nb, Rh, Pb, Si, Sr, Ti, Ta, Zn and Zr and Y is a real number where 0≦Y<12. The NO X sensor material may be used in a sensor element of a NO X sensor.
1. A NO X sensor comprising a sensor material, said material comprising Ba (1-X) A X Fe (12-Y) B Y O 19 , where constituent A and constituent B are doping elements; constituent A is selected from the group consisting of Bi, La and Pb; constituent B is selected from the group consisting of Al, B, Bi, Ca, Co, Cr, Cu, Er, Ga, In, Mg, Mn, Ni, Nb, Pb, Rh, Si, Sr, Ti, Ta, Zn and Zr; X is a real number where 0≦X<1 and Y is a real number where 0≦Y<12.
2. The NO X sensor of claim 1 , wherein B is Co, Cu, Mg, Ni or Zn.
3. The NO X sensor of claim 2 , wherein 0≦Y≦2.
4. The NO X sensor of claim 1 , wherein B is Al, B, Cr, Ga, In, Mn, Nb, Si, Ti or Zr.
5. The NO X sensor of claim 1 , wherein B is Al, Ga or In and 0≦Y≦2.
6. The NO X sensor of claim 1 , wherein B is B, Ca, Co, Mg, Ni, Sr, or Zn.
7. The NO X sensor of claim 6 , wherein 0≦Y≦2.
8. The NO X sensor of claim 1 , wherein B is Al, Bi, Co, Ga, In, Mg, Ni, Ta or Zr.
9. The NO X sensor of claim 1 , wherein A is Bi.
10. The NO X sensor of claim 9 , wherein 0≦X≦0.2.
11. The NO X sensor of claim 1 , wherein the sensor further comprises a sensor electrode in electrical contact with the sensor material.
12. The NO X sensor of claim 11 , wherein the sensor electrode comprises Pt, Pd, Rh, Os, Ir, Ru or Au.
13. The NO X sensor of claim 1 , wherein A is La or Pb or B is B, Ca, Co, Ga, Er, Mg, Rh, Sr, or Zn.
14. The NO X sensor of claim 13 , wherein the sensor material comprises BaFe 11.5 Ca 0.5 O 19 , BaFe 11.5 Zn 0.5 O 19 , Ba 0.99 Pb 0.01 Fe 12 O 19 , BaFe 11.9 Rh 0.1 O 19 , BaFe 11.5 B 0.5 O 19 , BaFe 11.5 Er 0.5 O 19 , BaFe 11.75 Mg 0.25 O 19 or BaFe 11.5 Sr 0.5 O 19 .
15. The NO X sensor of claim 1 , wherein the sensor material further comprises a non-stoichiometric excess of Ba dispersed within the sensor material as a sintering aid.
16. A NO X sensor comprising a sensor material, said material comprising Ba (1-X) A X Fe (12-Y-Z) B Y C Z O 19 , where constituent A, constituent B and constituent C are doping elements; constituent A is selected from the group consisting of Bi, La and Pb; constituents B and C are each selected from the group consisting of Al, B, Bi, Ca, Co, Cr, Cu, Er, Ga, In, Mg, Mn, Ni, Nb, Pb, Si, Rh, Sr, Ti, Ta, Zn and Zr; X is a real number where 0≦X<1 and Y+Z is a real number where 0≦Y+Z<12.
17. The NO X sensor of claim 16 , wherein B and C are each selected from the group consisting of Co, Cu, Mg, Ni and Zn.
18. The NO X sensor of claim 16 , wherein B and C are each selected from the group consisting of Al, B, Cr, Ga, In, Mn, Nb, Si, Ti and Zr.
19. The NO X sensor of claim 16 , wherein B and C are each selected from the group consisting of B, Ca, Co, Mg, Ni, Sr, and Zn.
20. The NO X sensor of claim 16 , wherein B and C are each selected from the group consisting of Al, Bi, Co, Ga, In, Mg, Ni, Ta and Zr.
21. The NO X sensor of claim 16 , wherein A is Bi.
22. The NO X sensor of claim 16 , wherein the sensor further comprises a sensor electrode in electrical contact with the sensor material.
23. The NO X sensor of claim 16 , wherein A is La or Pb, or B is B, Ca, Co, Ga, Er, Mg, Rh, Sr, or Zn.
24. The NO X sensor of claim 23 , wherein the sensor material comprises BaFe 11.5 In 0.25 Co 0.25 O 19 , BaFe 11.5 Ga 0.25 Co 0.25 O 19 , BaFe 11.8 Mg 0.15 B 0.05 O 19 or BaFe 11.8 Mg 0.15 Pb 0.05 O 19 .
25. The NO X sensor of claim 16 , wherein the sensor material further comprises a non-stoichiometric excess of Ba dispersed within the sensor material as a sintering aid.