Evolution of phase purity and texture on annealing of BiFeO3 thin film prepared by sol-gel technique |
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Authors: | Priyadarshini Dash B N Dash Haripriya Rath Chandana Rath and N C Mishra |
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Institution: | (1) Department of Physics, Utkal University, Bhubaneswar, 751 004, Orissa, India;(2) Department of Physics, SVM College, Jagatsinghapur, 754 103, Orissa, India;(3) School of Material Science & Technology, Institute of Technology, Banaras Hindu University, Varanasi, 221 005, Uttar Pradesh, India |
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Abstract: | We report preparation of phase pure BiFeO3 thin films on glass, ITO and Si(100) substrates through chemical route using spin coating technique. Sol-gel process was
adopted to prepare the films using bismuth nitrate and iron nitrate as precursors. X-Ray diffraction and Raman spectroscopy
studies revealed amorphous nature of the as deposited films. Rhombohedral crystalline phase of BiFeO3 evolved on annealing the films at 500°C, but with Bi2Fe4O9 and Bi24Fe2O39 as impurity phases. Increasing the annealing temperature to 550°C caused a drastic reduction of the impurity phases and at
600°C, the films were phase-pure BiFeO3. Micro Raman spectra showed features consistent with the reported characteristic peaks of BiFeO3 crystalline phase for films annealed at 500 and 550°C. Crystallite size obtained from X-ray diffraction line width analysis
are within 30 to 40 nm. Atomic force microscopy (AFM) however showed grain size of ∼192 nm, indicating polycrystalline nature
of the grains.
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Keywords: | Thin film bismuth ferrite multiferroic |
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