کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1596597 | 1515715 | 2007 | 5 صفحه PDF | دانلود رایگان |
Co- and Nb-substituted BiFeO3 polycrystalline ceramics were synthesized by a solid-state reaction, and their dielectric and magnetic properties were investigated. Co substitution increased the electrical resistivity of BiFeO3 by 2 orders of magnitude, while Co and Nb co-substitution raised the resistivity by 6 orders of magnitude, which allowed the dielectric constant and dielectric hysteresis to be determined at room temperature. The room temperature dielectric constant and loss tangent in co-substituted BiFeO3 were ∼85 and ∼0.02, respectively. The electric hysteresis loop was obtained in the co-substituted specimen, but the loop was not really saturated. Magnetic hysteresis loops were observed in substituted specimens, and Co and/or Nb substitution transformed anti-ferromagnetic (weak ferromagnetic) BiFeO3 into ferromagnetic. The magnetoelectric coupling was estimated by determining the changes in the dielectric constant with an external magnetic field.
Journal: Solid State Communications - Volume 144, Issues 7–8, November 2007, Pages 329–333