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Preparation of BiFeO3 Films by Sol-Gel Technique and Their Characterization

Authors: Zohra N. Kayani --- Saira Riaz --- Shahzad Naseem
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2019 Volume: 15 Issue: 1 Pages: 9-12
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

The present paper describes a simple low-temperature synthesis method of preparing bismuth ferrite thin films by sol-gel route, using bismuth nitrates and iron chloride, acetic acid and ethylene glycol. The films were layer by layer deposited on substrate (copper) using the spin-coating technique. The thickness of the layers was controlled by viscosity of the solutions and withdrawing speed parameters. After specific annealing, in air, the samples were characterized by x-ray diffractrometer (XRD), scanning electron microscopy (SEM) and electrical properties measurements. A more thoroughly control of the processing parameters seems to be essential in obtaining BiFeO3 thin films. Solution chemistry variations (differences in precursor type) can have a significant impact on the film properties. Conditions for synthesizing single BiFeO3 phase are critical since the temperature stability range of the phase is very narrow. Moreover, it is also difficult to control oxygen stoichiometry in the sample.

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