The metal oxide-containing solid electrolyte layer and its manufacturing method

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PROBLEM TO BE SOLVED : To provide a solid electrolyte allowing high electromotive force to be achieved when used in a fuel cell using ammonia as a fuel.SOLUTION : The solid electrolyte contains a layered metal oxide represented by the formula (1) : (LaA)(SrB)(CoC)O, where A represents a rare earth element other than La, B represents Mg, Ca, or Ba, C represents Ti, V, Cr, or Mn, 0≤x<1, 0≤y<1, 0≤z<1, and δ represents the amount of oxygen deficiency.