Effect of Co substitution on the structural,electrical,and magnetic properties of Bi_(0.9)La_(0.1)FeO_3 by sol-gel synthesis

摘要

Cobalt(Co)-doped Bi0.9La0.1FeO3 multiferroics were synthesized by a sol-gel method based on the autocombustion technique.As-synthesized powder was examined using various characterization techniques to explore the effect of Co substitution on the properties of Bi0.9La0.1FeO3.X-ray diffraction reveals that Co-doped Bi0.9La0.1FeO3 preserves the perovskite-type rhombohedral structure of BiFeO3,and the composition without Co preserves the original structure of the phase;however,a second-phase Bi2Fe4O9 has been identified in all other compositions.Surface morphological studies were performed by scanning electron microscopy.Temperature-dependent resistivity of the samples reveals the characteristic insulating behavior of the multiferroic material.The resistivity is found to decrease with the increase both in temperature and Co content.Room temperature frequency-dependent dielectric measurements were also reported.Magnetic measurements show the enhancement in magnetization with the increase in Co content.