Phase Transition (Spinel-Ortho) Ferrite Doped with Holmium

Abstract

A series of perovskite type oxides with formula La 1−x Ho x FeO 3 , with Ho substitute for La, where (x = 0.1, 0.2, 0.3 and 0.4). The samples have been prepared by the standard ceramic technique, sintered at 1200˚C for nine hours. Their crystalline structure was investigated using X-ray diffraction and IR spectroscopy. The X-ray diffraction analysis illustrates that the system La 1−x Ho x FeO 3 has a perovskite orthorhombic phase. IR absorption spectra of La 1−x Ho x FeO 3 showed two main characteristic absorption bands in the far infrared region. These bands are assigned to oxygen octahedral bending vibration and oxygen tetrahedron stretching vibration. It was found that the DC electrical conductivity increases linearly with temperature ensuring the semiconducting nature of the samples. The dielectric properties, Electron Spin Resonance (ESR) spectra, and thermal properties have been studied, to go through the material and explore its ability to be used for many industrial applications.

Structural, Gas Sensing and Dielectric Properties of HoXFe1-X FeO3 Perovskite Compound

“…The structure of Ho x Fe 1-x FeO 3 is not ideal perovskite, and the Fe +3 ions and O -2 ions depart from the ideal positions due to the difference between the radius of Ho ions and the Fe ions . It can be seen that the crystal size decreased with the increase in the proportion of Ho, because the Ho ions prevent grain growth during the sintering process, which leads to a reduction in the crystal size [10].…”