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Study of structural properties and conduction mechanisms of La0.67Ca0.2Ba0.13Fe0.97Ti0.03O3 perovskite
Authors: Dhahri, A; Moualhi, Y; Henchiri, C; Benali, A; Sanguino, P; Graca, MPF; Valente, MA; Abdelmoula, N; Rahmouni, H; Costa, BFO
Ref.: Inorg. Chem. Commun. 140, 109435 (2022)
Abstract: In the present investigation, the La0.67Ca0.2Ba0.13Fe0.97Ti0.03O3 perovskite structure is prepared using the auto combustion method. The Rietveld refinement of the X-ray diffraction results indicates that the prepared compound crystallizes in the orthorhombic structure with the Pnma space group. Morphologic and elastic properties are analyzed using electron microscopy and Raman spectroscopy techniques. The nanoparticles size of the investigated perovskite structure was determined using TEM microscopy and the nanocrystallites values were obtained from XRD patterns. The Raman investigation confirms that the prepared compound reveals similar vibration modes compared to the reported modes of the LaFeO3 structure. The semi-conductor behavior of the prepared compound is explained based on the small polaron hopping conduction mechanism. The conductivity spectra are studied using the universal Jonscher power law. The dynamic region of the spectra confirms the activation of the non-overlapping small polaron tunneling and the correlated barrier hopping conduction processes. Impedance analysis confirms the important role of the grain boundary contribution to the electrical properties of the studied structure. Also, the electrical conduction and the relaxation phenomena are related to the same origin. Different physical parameters of this compound are determined, which can orient their use in specific applications.
