the purpose of this research program is the demonstration of the technical feasibility of a high-temperature, solid-electrolyte fuel cell, building on the presently-existing technological base. the bulk of the work consists of identifying and selecting candidate component materials, fabricating cells and cell stacks from these materials, and testing these cells and cell stacks under conditions which might be expected in operation. the major emphasis is on the invention and fabrication of an interconnection film, which has the following properties at 1000 exp 0 c, the proposed temperature of stack operation: (1) chemical stability in air and fuel gas; (2) electronic resistivity in the working environment of less than 50 ohm-cm; (3) thermal expansion characteristics compatible with other components; and (4) non-reactivity with adjoining components. emphasis is also being placed on the fabrication of porous support tubes of calcia-stabilized zirconia, to the desired specifications of tensile strength, porosity, surface finish, and purity. concurrently, tubes will be prepared in-house and also will be purchased from commercial suppliers and evaluated for compliance with the following specifications: (1) tensile strength of 5000 to 10,000 psi; (2) open porosity of 25 to 30 volume percent; and (3) no surface pore greater than 10 mu m in diameter. progress is reported