Physicochemical Properties of Electrode Materials Based on Substituted Yttrium Manganite

Electrode materials Y 0.5 Ca 0.5 Mn 1− x (Co,Ni) x O 3 ( x = 0–0.1) have an o ′-orthorhombic perovskite structure. Doping with transition metals raises the content of ions Mn 4+ from 49% at x = 0 to 62% at x = 0.05 Ni. At 500–650 K there takes place an o′-o -orthorhombic transition, with the thermal expansion coefficient rising from (7.1–8.1) × 10 −6 to (10.5–11) × 10 −6 K −1 . Composition Y 0.5 Ca 0.5 Mn 1– x (Co, Ni) x O 3 is n -type semiconductor with a considerable oxygen constituent at >1000 K. Effect of the electrode material composition on the resistance parameter (ρ/ d ) of an intermediate layer E/SE and on the polarization resistance ( R η ) of the triple-phase boundary E/SE/GP is similar. At 300–1100 K and 10 2 –10 5 Pa, minimum values of these quantities are exhibited by samples with the Y 0.5 Ca 0.5 Mn 0.95 Ni 0.05 O 3 electrode layer 50 mg cm −2 thick.