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In this work we present a detailed investigation of the dielectric properties of the oxyborate Fe2OBO3 . This compound exhibits a high dielectric constant at room temperature (epsivr' > 103) for frequencies up to 104 Hz. An impedance spectroscopy analysis of the data reveals an important extrinsic contribution to these high epsivr' values. In order to eliminate the extrinsic contribution, we have sandwiched the sample in-between two mica layers, obtaining relatively high values of epsivr' at room temperature for this kind of oxides (epsivr' ~ 45). The temperature dependence of the remaining intrinsic contribution shows a jump, that at high frequencies occurs at the temperature at which a rearrangement of the charge-order pattern takes place and at low frequencies occurs at temperatures close to the onset of the antiferromagnetic long-range order. This suggests a certain coupling between the electronic, magnetic and dielectric properties in this compound.
Date of Publication: Nov. 2008