Study of structural, conduction mechanism and dielectric behavior of La_(0.7)Sr_(0.3)Mn_(0.8)Fe_(0.2)O_3 manganite

摘要

The new perovskite compound La_(0.7)Sr_(0.3)Mn_(0.8)Fe_(0.2)O_3 (LSMFO) was synthesized via the solid-state reaction process. The structural properties of LSMFO were measured at room temperature using Scanning Electron Microscopy and powder X-ray pattern. Our sample crystallized in the rhombohedral (R3c) structure. The electrical and dielectric behaviors were investigated by complex impedance (CI) spectroscopy. The results indicated the existence of an electrical relaxation process in LSMFO. Moreover, the frequency related to the ac-conductivity result was determined by Jonscher's universal law and the Correlated Barrier Hoping was the most appropriate theoretical mechanism to elucidate the electrical conduction process. The dielectric studies revealed that the dielectric relaxation was monitored by the dc electrical mechanism. The dielectric properties showed a high permittivity, which supports the potential use of LSMFO in electronic devices.