Structural, magnetic and electrical transport properties of Co doping in LaKFeMoO6 double perovskite

► Antisite defects decrease with Co doping in LaKFe1−yCoyMoO6 series. ► Antisite defects increase with substitution of K by La in La1+xK1−xFe1−yCoyMoO6 series. ► Electrical resistivities increase with Co content.