Abstract
In this work, a series of Ga1-xAlxFeO3 (x = 0, 0.1, 0.2, 0.5) nanoparticles was prepared by a modified Pechini method. The influence of Al doping at the Ga site on the structural, magnetic, and magnetodielectric (MD) properties of GaFeO3 nanoparticles was studied. The X-ray diffraction pattern analysis using the Rietveld refinement method indicated that all samples have an orthorhombic structure with Pc21n space group and the value of lattice parameters decrease systematically with increasing Al concentration. Interestingly, the magnetic characterization indicated that with increasing Al-content up to 0.5, the ferrimagnetic transition temperature (TC) increases from 310 to 350 K. It is also found that magnetic hysteresis curves measured below TC exhibit two-phase-like magnetic behavior consisting of hard and soft magnetic phases. Moreover, the simultaneous improvement of magnetic behavior and MD effect of Al-doped GaFeO3 samples are prominent candidates for the applications of room temperature multiferroic devices.
Highlights
Magnetoelectric gallium ferrite (GaFeO3, denoted as GFO), which exhibits ferrimagnetism and piezoelectricity,1,2 has gained a considerable attention from the scientific community in the context of multiferroics.3,4 Generally, GFO crystallizes in noncentrosymmetric orthorhombic crystal system with a space group Pc21n and the cations are distributed among four cationic sites Ga1, Ga2, Fe1, and Fe2
All the observed X-ray diffraction (XRD) peaks were indexed on the basis of an orthorhombic unit cell of space group, Pc21n, without any secondary phase
The remarkable observation from the XRD data was that the (221) diffraction peaks of GAF samples shifted towards higher diffraction angle with Al substitution, which indicates that the lattice parameters as well as the unit cell volume decreases with the doping of Al
Summary
Magnetoelectric gallium ferrite (GaFeO3, denoted as GFO), which exhibits ferrimagnetism and piezoelectricity, has gained a considerable attention from the scientific community in the context of multiferroics. Generally, GFO crystallizes in noncentrosymmetric orthorhombic crystal system with a space group Pc21n and the cations are distributed among four cationic sites Ga1, Ga2, Fe1, and Fe2. Magnetoelectric gallium ferrite (GaFeO3, denoted as GFO), which exhibits ferrimagnetism and piezoelectricity, has gained a considerable attention from the scientific community in the context of multiferroics.. GFO crystallizes in noncentrosymmetric orthorhombic crystal system with a space group Pc21n and the cations are distributed among four cationic sites Ga1, Ga2, Fe1, and Fe2. Where the Ga1 and Ga2 sites are predominantly occupied by Ga3+-ions, and other two Fe1 and Fe2 sites are mostly occupied by Fe3+-ions.. The sites of Fe1, Fe2, and Ga2 are octahedrally surrounded by oxygen, while the site of Ga1 is tetrahedrally coordinated by oxygen. Bulk GFO displays room temperature (RT) spontaneous polarization along the crystallographic b-axis and a ferrimagnetic (FM) structure below RT along the c-axis.. In case of site-disorder, recent studies suggest that the excess Fe atoms occupying the octahedral
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