| abstract |
(57) [Problem] To provide a gas concentration detection sensor capable of detecting a small amount of flammable gas (particularly, hydrocarbon gas) concentration with high accuracy even under a high concentration of oxygen or a change in oxygen concentration. A (A 1-x B x) (C 1-y D y) perovskite oxide represented by O 3-z, (Ce 1 -x P x) O 2-z -based oxide, and Mixtures and laminates containing these [A: L a, Pr, Ce, etc .; B: Sr, Ce, Ca; C: Cr, Mn, Fe, etc .; D: Cr, Ni, Mg, etc .; P: La, P r, Nd, etc .; 0 ≦ X ≦ 0.5, 0 ≦ Y ≦ 0.5]. |