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Dielectric relaxation and magneto-dielectric effect in polycrystalline Bi <inf>0.9</inf>Ca <inf>0.1</inf>FeO <inf>2.95</inf>
Date Issued
18-06-2012
Author(s)
Ramachandran, B.
Dixit, A.
Naik, R.
Lawes, G.
Indian Institute of Technology, Madras
Abstract
We have investigated temperature, frequency, and magnetic field dependent dielectric properties of polycrystalline Bi 0.9Ca 0.1FeO 2.95. Two dielectric anomalies, near 65 K and 260 K, were observed with the anomaly near 65 K exhibiting distinct frequency dependence as the peak temperature shifts with increasing frequency. The low-temperature dielectric relaxation data that can be fitted to a Vogel-Fulcher expression yielding a characteristic relaxation time of ∼10 -8 s are four orders larger than that of pure BiFeO 3 which may be the resultant of the chemical pressure induced by Ca doping. We also observed a switchable magneto-dielectric response in Bi 0.9Ca 0.1FeO 2.95 at room temperature. © 2012 American Institute of Physics.
Volume
100