%0 Journal Article %T Elaboration and Characterization of Materials from the LaMnO 3 –BiMnO 3 Binary System %+ Université Mouloud Mammeri [Tizi Ouzou] (UMMTO) %+ Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3) %A Djahmoum, Mourad %A El Kechaï, Omar %A Marchet, Pascal %< avec comité de lecture %@ 0031-8965 %J physica status solidi (a) %I Wiley %8 2020 %D 2020 %R 10.1002/pssa.201900814 %K perovskites %K solid solution %K phase transitions %K semiconductor materials %K ceramics %Z Chemical Sciences/Material chemistry %Z Chemical Sciences/Inorganic chemistryJournal articles %X The study of the La(1-x)BixMnO3 system was carried out using X-ray diffraction and electrical measurements. A continuous solid solution was evidenced for the LaMnO3 rich part of this system (x ≤ 0.6). According to the analyses of XRD results, a rhombohedral symmetry (3) was observed for x ≤ 0.4 and a cubic structure for x = 0.5. The structural study allowed to determine an increase of the mean perovskite lattice parameter, together with a decrease of the rhombohedral angle up to a cubic symmetry for x = 0.5. For x > 0.6, the system is no more single-phased. Impedance measurements were carried out for ceramics in a wide frequency range (100 Hz-1 MHz), between room temperature and 800°C. The exponential decrease of the AC conductivities (σAC) and the room temperature values correspond to a semiconducting behavior. DC conductivity measurements (σDC) were also performed below room temperature (25K < T < 300K). The results evidence for a metal-insulator phase transition. For the exponential part of the σDC curves, the gap energy is between 0.1 and 0.2 eV, confirming the semiconductor behavior of these materials. %G English %2 https://unilim.hal.science/hal-02465803/document %2 https://unilim.hal.science/hal-02465803/file/revised%20Article%20.pdf %L hal-02465803 %U https://unilim.hal.science/hal-02465803 %~ UNILIM %~ CNRS %~ SPCTS %~ SPCTS-AXE3 %~ IPAM %~ INC-CNRS %~ IRCER %~ IRCER-AXE3 %~ IMPEO %~ TEST2-HALCNRS