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Substitution of La by Sr in the 25% Ni doped charge transfer insulator LaFeO3creates structural changes that inflect the electrical conductivity caused bysmall polaron hopping via exchange interactions and charge transfer. Thesubstitution forms electron holes and a structural crossover from orthorhombicto rhombohedral symmetry, and then to cubic symmetry. The structural crossoveris accompanied by a crossover from Fe3+-O2--Fe3+ superexchange interaction toFe3+-O2--Fe4+ double exchange interaction, as evidenced by a considerableincrease of conductivity. These interactions and charge transfer mechanismdepend on superexchange angle, which approaches 180{\deg} upon increasing Srconcentration, leading an increased overlap between the O (2p) and Fe/Ni (3d)orbitals.

journal of applied physics

Entanglement of charge transfer, hole doping, exchange interaction and  octahedron tilting angle and their influence on the conductivity of  La1-xSrxFe0.75Ni0.25O3-{\delta}: A combination of x-ray spectroscopy and  diffraction