Elaboration and Characterization of Materials from the LaMnO3-BiMnO3 Binary System
Abstract
The study of the La(1-x)BixMnO3 system is conducted using X-ray diffraction (XRD) and electrical measurements. A continuous solid solution is evidenced for the LaMnO3 rich part of this system (x ≤ 0.6). According to the analyses of XRD results, a rhombohedral symmetry () is observed for x ≤ 0.4 and a cubic structure for x = 0.5. The structural study allows to determine an increase in the mean perovskite lattice parameter, together with a decrease in 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 are conducted for ceramics in a wide-frequency range (100 Hz-1 MHz), between room temperature and 800 °C. The exponential decrease in the alternative current (AC) conductivities (σAC) and the room temperature values correspond to a semiconducting behavior. Direct current (DC) conductivity measurements (σDC) are also performed below room temperature (25 K < T < 300 K). 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.
- Publication:
-
Physica Status Solidi Applied Research
- Pub Date:
- March 2020
- DOI:
- 10.1002/pssa.201900814
- Bibcode:
- 2020PSSAR.21700814D