Phase Transition of High-Surface-Area Glycol-Thermal Synthesized Lanthanum Manganite.

ABSTRACT: Cubic and rhombohedral phases of lanthanum manganite were synthesized in a high-pressure reactor. A mixture of La and Mn nitrates with ethylene glycol at a synthesis temperature of 200 °C and a calcination temperature of up to 1000 °C, resulted in a single-phase perovskite, LaMnO₃ validated using X-ray diffraction. Significant changes in unit cell volumes from 58 to 353 ų were observed associated with structural transformation from the cubic to the rhombohedral phase. This was confirmed using structure calculations and resistivity measurements. Transmission electron microscopy analyses showed small particle sizes of approximately 19, 39, 45, and 90 nm (depending on calcination temperature), no agglomeration, and good crystallinity. The particle characteristics, high

SUBMITTER: Anyanwu VO 

PROVIDER: S-EPMC9920577 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature