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Mössbauer and magnetic studies of (La0.8Ca0.2)1-xBixFeO3 perovskites
Authors: Hajer Issaoui, Adel Benali, Moez Bejar, Essebti Dhahri, Benilde F. O. Costa
Ref.: Hyperfine Interactions, 241-26 (2020)
Abstract: The effect of Bi doping of (La0.8Ca0.2)1-xBixFeO3 perovskites on structural and magnetic properties was investigated. X-ray diffraction, magnetometry and Mössbauer spectroscopy measurements were performed on the samples. The sol gel prepared samples were annealed at 800 °C, 900 °C and 1200 °C. The samples crystallize in an orthorhombic structure with a PNMA space group. The LCBFO800 samples have Mössbauer spectra with large sextets in accordance with the small grain size. The several spectral components observed in the sample series are in accordance with the ones found in literature. Hyperfine magnetic fields decrease slightly with Bi content and increase with annealing temperature. Isomer shifts and quadrupole splitting stay constant with composition and annealing temperature. Magnetometry measurements show that the antiferromagnetic behavior is dominate over the ferromagnetic one. Bi doping increases coercivity and decreases remanent magnetization, while annealing temperature increases coercivity and remanent magnetization.
