Structural, optical, and dielectric studies of LaFe_1−xMo_xO₃ (x = 0.0, 0.5) perovskite materials

Heidi Laysandra^1,2*, D Triyono², Hsiang-Lin Liu¹

¹Department of physics, National Taiwan Normal University, Taipei, Taiwan
²Department of physics, Universitas Indonesia, Depok, Indonesia

* Presenter:Heidi Laysandra, email:heidilaysandra@gmail.com

The structural, optical, and dielectric properties of LaFe_1−xMo_xO₃ (x = 0.0, 0.5) synthesized by the sol-gel method were investigated by X-ray diffraction (XRD), Raman scattering, and impedance spectroscopy. XRD analysis revealed that the x = 0.5 compound is single-phase and orthorhombic, with space group Pbnm, similar to the parent x = 0.0 compound but with larger lattice parameters and/or a larger unit-cell volume. The Raman scattering spectra revealed local lattice distortions in the x = 0.5 compound and spin–phonon coupling related to the magnetic transition (Néel) temperature. The impedance data were well fitted with an R(R1-CPE1)//(R2-CPE2) equivalent electrical circuit, demonstrating the contributions of both grains and grain boundaries. The temperature (300–500 K) and frequency (100 Hz to 1 MHz) dependences of the dielectric properties showed that Mo substitution adversely affected the dielectric parameters.

Keywords: Perovskite LaFe_1−xMo_xO₃, structural , optical, dielectric properties