Influence of iridium (Ir) doping on the structural, electrical, and dielectric properties of LuFeO3 perovskite compound

Rare-earth ferrites have been intensively investigated owing to their magnetic, electrical, and optical features in the literature. The present quest goals to examine the electrical properties of LuFeO3 (LFO) and LuFe1-xIrxO3 (LFIO) ceramics with different mol%, x = 0.05 and 0.10. X-ray diffractometer (XRD) method was utilized to identify the crystal nature of the obtained powders. The scanning electron microscope (SEM) was exploited to examine the surface topography of the fabricated pellets. X-ray photoelectron spectroscopy (XPS) was employed to find out the valence states of lutetium (Lu) (data is not presented here), iron (Fe), and iridium (Ir). Electrical modulus, dielectric constant, and conductivity of LFO and LFIO ceramics were detailed by dielectric/impedance spectroscopy measurements, which were performed at between - 100 degrees C (173 K) up to 100 degrees C (373 K) with 20 degrees C temperature step. It was exhibited that the undoped LFO has a higher dielectric constant and conductivity than the Ir doped samples. Such a decrement in both dielectric constants and conductivity was related to i) reduction in the ratio of Fe2+ ions and ii) defects and/or distortion in the LFO structure due to Ir substitution. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Rare-earth ferrites, particularly LuFeO3 and LuFe1-xIrxO3 ceramics with different mol%, were studied for their electrical properties. Various techniques, including XRD, SEM, and XPS, were utilized to investigate the crystal nature, surface topography, and valence states of the materials. The study revealed that undoped LFO exhibited higher dielectric constant and conductivity compared to the Ir doped samples, which was attributed to the reduction in Fe2+ ions ratio and defects/distortions in the LFO structure.