The porous support tube has been further characterized with respect to gas permeability and strength interrelationship as a function of extrusion mix particle size and pore former content. Long tubes, up to 70 cm in length, have been successfully fabricated in initial trial runs. The power contact design has undergone initial heat transfer proof testing. Electrical resistivity and thermal expansion tests have been performed on Y/sub 0.9/Ca/sub 0.1/CrO/sub 3/, a candidate air electrode/electrolyte interfacial layer. The elevated temperature contraction behavior of La/sub .9/Sr/sub .1/MnO/sub 3/ air electrode containing 10 w/o ZrO/sub 2/, was also determined. Trial runs of interconnection and electrolyte were performed on the new batch EVD reactor. FBA cell fabrication and testing experiments continued, aimed at stabilizing both the air electrode/electrolyte and fuel electrode/electrolyte interfaces, so that performance and life objectives can be met in the near future. Microstructural analyses of cells tested up to 900 h at 1000/sup 0/C indicate that degradation in cell performance is not related to any obvious interfacial reactions between cell components. Analytical electrical tests continue on cell components in an attempt to relate the data obtained to cell behavior history.