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We have investigated the coupling effect between magnetic and electric orders of the commensurate antiferromagnetic compound Nb2Co4O9. In magnetically ordered state (TN = 27.5 K), a significant magnetoelectric effect, in which the electric polarization generated below its antiferromagnetic temperature shows a field-dependent increase, has been observed. Accordingly, the field-induced dielectric peak...
Polycrystalline Mn4Ta2O9 is prepared to investigate its magnetoelectric effect, due to its specific crystal and magnetic structure. The dielectric properties and electric polarization of this compound have been carefully examined in various magnetic fields. No dielectric anomalies and spontaneous polarization is observed under zero magnetic field. While, the dielectric peak appears around the onset...
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