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Title: Nonstoichiometric BiFe₀.₉Ti₀.₀₅O₃multiferroic ceramics with ultrahigh electrical resistivity
Authors: Gu, YH
Wang, Y 
Chen, F
Chan, HLW 
Chen, W
Issue Date: 1-Nov-2010
Source: Journal of applied physics, 1 Nov. 2010, v. 108, no. 9, 094112, p. 1-5
Abstract: BiFeO₃, BiFe₀.₉Ti₀.₁O₃, and BiFe₀.₉Ti₀.₀₅O₃ceramics of relatively high perovskite phase content were prepared for a comparison study. While both BiFe₀.₉Ti₀.₁O₃ and BiFe₀.₉Ti₀.₀₅O₃ exhibit similarly improved weak ferromagnetism over BiFeO₃, there exists a major difference in the x-ray diffraction patterns of BiFe₀.₉Ti₀.₁O₃and BiFe₀.₉Ti₀.₀₅O₃ , and the leakage current of BiFe₀.₉Ti₀.₀₅O₃is decreased by five orders of magnitude from that of BiFe₀.₉Ti₀.₁O₃. With an ultrahigh electrical resistivity, over 1 x 10¹⁴Ωcm, BiFe₀.₉Ti₀.₀₅O₃ ceramic displays an especially low dielectric loss, 0.015 at 100 Hz, a remanent polarization Pힲ of 0.23 μC/cm² and a remanent magnetization Mힲ of 0.13 emu/g at room temperature. It is proposed that the Fe-deficiency in BiFe₀.₉Ti₀.₀₅O₃ decreases the amount of Fe²⁺ and leads to the ultrahigh electrical resistivity. Nonstoichiometric compositions should receive more attention for developing high quality BiFeO₃ multiferroic materials.
Keywords: Bismuth compounds
Dielectric losses
Dielectric polarisation
Electrical resistivity
Ferroelectric ceramics
Ferromagnetic materials
Leakage currents
Multiferroics
Remanence
Stoichiometry
X-ray diffraction
Publisher: American Institute of Physics
Journal: Journal of applied physics 
ISSN: 0021-8979
EISSN: 1089-7550
DOI: 10.1063/1.3506526
Rights: © 2010 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Y.H. Gu et al., J. Appl. Phys. 108, 094112 (2010) and may be found at http://link.aip.org/link/?jap/108/094112
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