44.
Using the citrate sol-gel method, a new complex oxide Ca
0.75Y
0.25Co
0.15Mn
0.85O
2.92 is synthesized. It is shown that this compound is crystallized in the rhombically distorted version of perovskite structure (
a = 0.53397(8),
b = 0.7470(1),
c = 0.52810(6) nm). The phase is characterized by a low coefficient of thermal expansion (CTE) (13.8 ppm K
?1) and high electric conductivity (135 S/cm at 900°C). The chemical reaction between Ca
0.75Y
0.25Co
0.15Mn
0.85O
2.92 and the YSZ and GDC electrolyte materials is studied. The material is highly reactive and reacts with YSZ and GDC at 900°C and 1070°C, respectively. It is concluded that Ca
0.75Y
0.25Co
0.15Mn
0.85O
2.92 is a promising cathodic material for solid oxide fuel cells, provided a reliable protection SDC sublayer is formed between the cathode and the YSZ membrane.
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