Flat yttria-stabilized zirconia (YSZ) films were prepared by the doctor blade technique. The joining of the solid oxide fuel cell (SOFC) stack was carried out using La 0.7 Ca 0.3 + x CrO 3 (x = 0.03 and 0.06) green films as sealants between the YSZ electrolyte layer and the La 0.8 Ca 0.2 + y CrO 3 (y = 0.02 and 0.03) separator. Reactions between the component layers of the stack were examined in terms of elemental diffusion. The YSZ film produced by the doctor blade technique yields about the same electrical conductivity as the YSZ pellet. During the joining, the Ca in the sealant diffused and dissolved into YSZ and La 0.8 Ca 0.23 CrO 3 , and the sealants reacted with YSZ to form CaZrO 3 phase at the interface. The joining was accomplished by the formation of thick CaZrO 3 layers at the interface.