Strong correlation between structural, magnetic and transport properties of non-stoichiometric Sr2FexMo2−xO6 (0.8 ≤ x ≤ 1.5) double perovskites

► The structural transition from tetragonal to cubic lattice structure occurs around x = 1.2 wt.% in Sr2FexMo2-xO6 (0.8 ≤ x ≤ 1.5). ► The maximum degree of Fe/Mo ordering(ηmax), Saturation magnetization (Ms) and percentage of magnetoresistance (MR%) is maximum at x = 1.0 wt.% and decreases as x deviates from 1.0 in Sr2FexMo2-xO6 (0.8 ≤ x ≤ 1.5). ► Concentration of anti site defects (ASDs) is minimum at x = 1.0 wt.% and increases as x deviates from 1.0 in Sr2FexMo2-xO6 (0.8 ≤ x ≤ 1.5). ► Different resistivity behavior have been observed at x ≤ 1.2 wt.% and x > 1.2 wt.% samples of Sr2FexMo2-xO6 (0.8 ≤ x ≤ 1.5).