Structural properties and electrical resistivity behaviour of La1−x KxMnO3 (x = 0.1, 0.125 and 0.15) manganites

► La1-xKxMnO3 manganites crystallize in rhombohedral structure (R−3C). ► K doping at La site enhances metal-insulator transition. ► Metallic resistivity shows electron, magnon and phonon scattering are significant. ► Polaronic effects are the major proponents for semiconducting resistivity. ► Resistivity upturn contributes to Coulomb and Kondo-like scattering.