NdBaMn2O5 (+ delta) compound has been studied as a possible symmetric SOFC electrode. The A-site and charge ordered NdBaMn2O5 material has been synthesized by solid-state reaction in a reducing atmosphere at 1100 degrees C for 12 h; the resulting material crystallizes in root 2a(p) x a(p) x 2a(p) tetragonal cell of P4/nmm space group. Thermogravimetric analysis coupled to HT-XRD experiment shows that the material is completely stable to redox cycling between air and 5% H-2/Ar up to at least 850 degrees C. In air, the phase is completely oxidized to A-site ordered NdBaMn2O6 (P4/mmm) and in anode conditions is reduced back to its initial form, with intermediate formation of orthorhombic NdBaMn2O5.5 ordered phase. Considering possible conditions of cell preparation in air (T = 1300 degrees C for 6 h), a loss of A-site ordering is evidenced but the material is reduced back to ordered NdBaMn2O5 at 850 degrees C in diluted hydrogen. Whereas the material reacts strongly with SYSZ at 1300 degrees C, no particular chemical affinity with 20GDC is observed neither at high temperature in air nor at 850 degrees C in anodic atmosphere; TEC coefficients for NdBaMn2O5 (+) (delta), measured in both anode and cathode conditions, are also in good agreement with reported TEC values for a ceria electrolyte. Relatively low values of electrical conductivity are found in diluted hydrogen whereas a sufficient level for the application is obtained in air. (C) 2016 Elsevier B.V. All rights reserved.