Optical, impedance, and relaxation response of Fe3+ doped double perovskite solid solution Lutu Sahoo, Bichitra Nanda Parida, Nimai Charana Nayak and Rajanikanta Parida Eur. Phys. J. Appl. Phys., 98 (2023) 47 Published online: 07 July 2023 DOI: 10.1051/epjap/2023220286