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              <p>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 &gt; 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 &lt; T &lt; 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.</p>
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