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Erschienen in:
01.03.2015
Enhanced magnetic and ferroelectric properties in Cr doped Bi2Fe4O9 ceramics
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 3/2015
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Abstract
Single phase Bi2Fe4(1−x)Cr4xO9 (0 ≤ x ≤ 0.08) ceramics are prepared by a modified Pechini method to investigate the effect of Cr doping on magnetic and ferroelectric properties. The results show that both the magnetic and ferroelectric properties are strongly dependent on Cr doping. With the introduction of Cr ions, Bi2Fe4O9 ceramics change from antiferromagnetism to weak FM at room temperature, in accompaniment with the enhancement of ferroelectric properties. The remnant magnetization and polarization enhance monotonically from 0.014 emu/g and 0.103 μC/cm2 for x = 0.02 sample to 0.025 emu/g and 0.53 μC/cm2 for x = 0.08 sample, respectively. The improvement of magnetic and ferroelectric properties should be mainly related to the suppression of inhomogeneous magnetic spin structure and the reduction of electric leakage by Cr doping. These results suggest that Cr doping can adjust the magnetic and ferroelectric properties of Bi2Fe4O9 ceramics, which is a promising candidate for room temperature multiferroics.