Investigation of Structural and Electrical Properties of 90%La0.67Pb0.33MnO3 + 10%A and 90%La0.67Pb0.33CoO3 + 10%A (A= MnO2, NiO, SnO2 and Cu2O) Composite Materials

In this study, the crystal structures, surface morphologies and electrical conductivity of composite materials, La0.67Pb0.33MnO3, La0.67Pb0.33CoO3 compounds and 90%La0.67Pb0.33MnO3 + 10%A and 90%La0.67Pb0.33CoO3 + 10%A (A= MnO2, NiO, SnO2 and Cu2O), were investigated. As a result of the X-ray diffraction (XRD) analysis, it was found that all samples have trigonal crystal symmetry ( . The refinements have demonstrated that MnO2, NiO, SnO2, and Cu2O compounds, which are employed in the production of composite materials, are present within both the perovskite crystal structure of these compounds and as a secondary phase in the composite materials. The results from AFM and SEM analyses align with those from XRD refinement. Electrical resistivity measurements (r-T) were conducted to ascertain the metal-insulator phase transition temperatures (TIM) of various compounds and composite materials. While La0.67Pb0.33MnO3 compound and these compound-based composite materials exhibited a clear TIM phase transition, no TIM phase transition was observed in the La0.67Pb0.33CoO3 compound and these compound-based composite materials.