Nano-crystalline La1-xMxGa1-yNyO3 +/-delta (M = Sr; square (vacancy), x = -0.10 to 0.15; N = Mn, Mg; y = -0.10 to 0.15) compositions were synthesized by various wet chemical methods. The La- or Ga-deficient compositions are attempted to avoid substitution of aliovalent cations which can facilitate the formation of single phase at relatively low temperature by restoring the nano-crystalline nature of the powders. The wet chemical methods like metal-carboxylate gel decomposition, hydroxide co-precipitation and regenerative sol-gel process followed by microwave sintering in a very short interval time (30 min) of the powders were attempted at similar to 1200 degrees C. The powders were characterized by various techniques like XRD, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The grain size measured was similar to 22 nm range. The electrical conductivities of the compositions were measured by ac and dc techniques. The conductivity of a sintered pellet was found to be similar to 0.01-0.21 S cm(-1) at 550-1000 degrees C range, respectively. The influence of process parameters on the properties of the materials based on experimental observations and literature data is discussed. The advantages of nano-crystalline nature of the powders over microcrystalline powders synthesized by the conventional methods of preparation were brought out. The effect of wet chemical methods especially regenerative sol-gel in producing nano-crystalline perovskites with multi-element substitutions at A- and B-sites (of ABO(3)) to achieve physico-chemical compatibility for fabricating zero emission all perovskite IT-SOFCs has been reported. (c) 2006 Elsevier B.V. All rights reserved.