| 摘要 |
A perovskite structure comprises a first element X, strontium, iron, cobalt, oxygen and tungsten; where the first element X is barium and/or a lanthanide and wherein the structure comprises a region of single perovskite and a region of double perovskite. The structure may be included in an electrode for a solid oxide fuel cell (SOFC). A method of forming a perovskite structure comprises mixing a first element X, strontium, iron, cobalt, oxygen and tungsten; heating the mixture to a first temperature for a first period of time to form a single perovskite; and heating the mixture to a second temperature for a second period of time to form a double perovskite; where the first element X is barium and/or a lanthanide. Preferably, the first temperature is in the range 650ºC to 750ºC, and the second temperature is in the range 850ºC to 1000ºC. The molar percentage of tungsten may be in the range of 5-10%. Preferably, the structure has the formula (Ba1-xSrx)(Co1-yFey)WbOc, where both x and y are independently in the range 0.1 to 0.9; a+b is equal to 1; and c is in the range 2 to 3. |
