transition with RE, an extended study on REBa2Cu3O6+δ (REBCO, RE=Rare Earth) family, obtained through a similar combustion reaction path and characterized by synchrotron X-ray Powder Diffraction (S-XRD) is presented.We have found that the larger the RE cation reduces the O/T phase transition temperature, being eliminated in the RT-900°C range for RE=Nd, making it a more promising IT-SOFC cathode material in process of being characterized.