Monoclinic and its manufacturing method

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PROBLEM TO BE SOLVED : To provide a single room type solid electrolyte fuel cell stably providing relatively high current at 600 deg.C or lower without thinning an electrolyte and to provide the manufacturing method of the single room type solid electrolyte fuel cell. SOLUTION : This single room type solid electrolyte fuel cell has a single room type cell structure in which a positive electrode 2 and a negative electrode 3 are installed on the same surface of an oxygen ion conductive solid electrolyte 1, the positive electrode 2 is strontium-doped Ln1-x Srx CoO3-δ (wherein Ln is a rare-earth element), and the negative electrode 3 contains nickel and a composite oxide mainly comprising cerium oxide. The single room type solid electrolyte fuel cell uses the oxygen ion conductive solid electrolyte of thickness having sufficient mechanical strength at of 600 deg.C or lower and can stably generate power.