Structural,optical, and multiferroic properties of single phased BiFeO3 |
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Authors: | M. Muneeswaran P. Jegatheesan M. Gopiraman Ick-Soo Kim N. V. Giridharan |
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Affiliation: | 1. Department of Physics, National Institute of Technology, Tiruchirappalli, 620 015, India 2. Nano Fusion Technology Research Group, Faculty of Textile Science and Technology, Shinshu University, Ueda, Nagano, 386-0015, Japan
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Abstract: | A soft chemical coprecipitation method has been proposed for synthesis of nano-sized multiferroic BiFeO3 (BFO) powders. The X-ray diffraction pattern confirms the perovskite structure of BFO and Rietveld refinement reveals the existence of rhombohedral R3c symmetry. Crystallite size and strain value are studied from Williamson–Hall (W–H) analysis. The transmission electron microscope (TEM) image shows that the particle size of BFO powders lies between 50–100 nm. 4A1 and 7E Raman modes have been observed in the range 100–650 cm?1 and a prominent band centered around 1150–1450 cm?1 have also been observed corresponding to the two-phonon scattering. Differential Thermal Analysis (DTA) shows the existence of two prominent peaks at 330 °C and 837 °C corresponding to the magnetic and ferroelectric ordering, respectively. From the temperature dependent dielectric studies, an anomaly in the dielectric constant is observed at the vicinity of Neel temperature (T N ) indicating a magnetic ordering. Also, BFO shows antiferromagnetic behavior measured from the magnetic studies. |
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