| abstract |
An oxygen sensor element with improved productivity and workability is provided. An oxygen sensor element comprising a ceramic sintered body and detecting an oxygen concentration based on a current value when a voltage is applied, wherein the ceramic sintered body has a composition formula LnBa 2 Cu 3 O 7-δ. A part of (Ln is a rare earth element, δ is 0 to 1) is replaced with, for example, any element selected from elements of Group 2 of the periodic table and any element selected from lanthanoid elements. against a composition formula Ln 1-z Ca z Ba 2 -z La z Cu 3 O 7-δ (0.25 ≦ z ≦ 1) represented by composition, xVOL% by outer percentage (0 <x < 30) Silver oxide (Ag 2 O) is added. [Selection] Figure 1 |