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Composition dependent magnetic and ferroelectric properties of hydrothermally synthesized GdFe 1-x Cr x O 3 (0.1 ≤ x ≤ 0.9) perovskites.
The hydrothermal synthesis and magnetic, dielectric and ferroelectric property characterization of ABO3 -perovskite GdFe1-x Crx O3 (0 < x < 1) are reported. The mineralizer KOH plays a critical role in the perovskite structure of the sample. The Fe/Cr ratio of the final crystal is controlled by the alkalinity in the initial reaction mixtures. The lattice parameters and magnetic ordering transition temperature have a close relationship with the Fe/Cr ratio. The temperature dependent magnetic properties of GdFe1-x Crx O3 (0 < x < 1) samples show a close relationship with substituent ratios of Cr3+ . The occurrence of ferromagnetic behavior in all of the as-prepared samples comes from the coexistence of canted-antiferromagnetism due to the double exchange effect of Fe-O-Fe and Cr-O-Cr and ferromagnetism due to superexchange interaction of Fe-O-Cr. A large spontaneous polarization was observed in GdFe1-x Crx O3 at room temperature, exhibiting a clear ferroelectric hysteresis loop, which indicates the ferroelectric behavior in this system. This work not only provides an effective route to the controllable synthesis of B-site doped REFe1-x Crx O3 perovskite structure materials, but also presents a comprehensive study of the tunable effect of ionic doping on ferroelectric properties.
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