Abstract
The effect of Er3+ substitution on the physical properties of SmFeO3 was studied through magnetic and electrical measurements. The X-ray diffraction patterns of Sm1-xErxFeO3 samples showed that the lattice constants decrease with increasing Er content. As a result, the distortion of Er -doped SmFeO3became significant. The magnetic hysteresis loops of samples indicate that the antiferromagnetic trend increases with Er concentration. The anomaly in Ac susceptibility (χ) and dielectric constant curves for Sm1-xErxFeO3 provided evidence for occurring spin reorientation transition (SRT) in these compounds and are also observed the gradual decrease in SR temperature with increasing Er3+ions. Furthermore, the electrical measurements exhibited a considerable enhancement in the dielectric constant. Sm0.3Er0.7FeO3 is the only compound that presented a colossal dielectric constant (CDC) (103) at room temperature which is attributed to relaxor-ferroelectrics. Likewise, the appearance of magnetic and ferroelectric hysteresis loops indicated the coexistence of magnetism and ferroelectricity.
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