Effect of the Zr-Substitution on the Structural and Electrical Properties of LaFeO3: XRD, Raman Scattering, SEM, and Impedance Spectroscopy Study

Abstract

The LaFe1−xZrxO3 (x = 0.01, 0.05) ceramics were prepared by sol-gel and annealing method and studied by XRD, Raman scattering analysis, SEM, and impedance spectroscopy method. The crystal structure and phonon characteristics analysis revealed that the crystal structure tends to preserve its ideal orthorhombic structure, following the increase in driving force of the Fe/ZrO6 octahedral tilting. The frequency-dependent dielectric parameters at each temperature decreased with increasing Zr content. The temperature dependence dielectric relaxation and dc conduction mechanism satisfied the Arrhenius law and increased with increasing Zr content. The activation energy ranged from 0.30 to 0.50 eV and was similar in the relaxation and conduction mechanisms, indicating that both transport mechanisms were based on a similar mechanism.

LaFe1–xCoxO3 Perovskite Nanoparticles Supported on Ni(OH)2 as Electrocatalyst for the Oxygen Evolution Reaction

“…The Raman spectra have limitations in resolving power, intensity, and band overlapping, which affect the observed modes. The out of phase La vibrations of A g symmetry are observed around 138 cm –1 as broader nature modes . The oxygen octahedral tilt modes of A g symmetry along with the combination of La site are assigned to the peaks located around 282 and 312 cm –1 .…”

“…The out of phase La vibrations of A g symmetry are observed around 138 cm −1 as broader nature modes. 33 The oxygen octahedral tilt modes of A g symmetry along with the combination of La site are assigned to the peaks located around 282 and 312 cm −1 . 34 The oxygen octahedral bending vibration of B 2g , B 1g , and B 3g symmetry are attributed to the pair of peaks around 391, 421, and 475 cm −1 , respectively.…”

Preparation of Crystalline LaFeO3 Nanoparticles at Low Calcination Temperature: Precursor and Synthesis Parameter Effects

“…In order to investigate the mechanism of lowering the calcination temperature, the precursors prepared under different conditions before and after calcination at 800 °C were probed using Raman spectroscopy, which is sensitive to the LFO-based perovskite structure [ 28 , 29 , 30 ]. The Raman spectra of the precursors prepared under different conditions after calcination at 800 °C are shown in Figure 5 b.…”

Structural, morphological, Raman, dielectric and electrical properties of La1−2xBaxBixFeO3 (0.00 ≤ x ≤ 0.20) compounds

“…On the other side, previous researcher works have shown that the substitution of the La-site with divalent metals and/or Fe-site with transition metals has an important impact on the structural, magnetic, dielectric, electrical and gas sensing properties. [17][18][19] For instance, it has been conrmed that the ''Sr'' ions substituted at the A-site of the LaFeO 3 compound increase its electrical conductivity. 20 Moreover, E. Cao et al 21 conrmed that the ''Na'' substitution in the La-site of LaFeO 3 enhances this dielectric constant.…”