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Characterization of B site codoped LaFeO3 nanoparticles prepared via co-precipitation route

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Abstract

LaFe1−x−y Co x Pd y O3 [(x, y) = (0, 0), (0.40, 0), (0.38, 0.05)] nanoparticles were synthesized via a co-precipitation route using ammonium hydroxide, sodium hydroxide and ammonium carbonate as the precipitant and calcination at different temperatures to study the compositional driven structural changes in lanthanum ferrites. Analysis of X-ray diffraction (XRD) patterns confirms the formation of single-phase perovskite structure and existence of orthorhombic Pnma symmetry for calcined powders. Field emission scanning electron microscope (FESEM) observations show that Pd-doped powders yield finer particles along with narrower particle size distribution compared with LaFeO3 and LaFe0.6Co0.4O3. Moreover, using ammonia as the precipitant leads to a smaller mean particle size of powders compared to NaOH, as well as significant difference in morphology of the particles. Raman analysis reveals that both Co and Pd atoms substitute Fe site in perovskite structure with shifting of phonon modes. Comparing Raman spectra demonstrates the presence of more oxygen vacancies in Pd-doped perovskites. It can be concluded from the results that Pd is successfully incorporated into the perovskite structure by co-precipitation method.

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Acknowledgments

This work was financially supported by University of Tehran (No. 810729920/6/02) and Iran Nanotechnology Initiative Council.

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  1. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, 14395-553, Iran

    Seyedeh Behnaz Varandili, Alireza Babaei & Abolghasem Ataie

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  1. Seyedeh Behnaz Varandili
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Correspondence to Alireza Babaei.

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Varandili, S.B., Babaei, A. & Ataie, A. Characterization of B site codoped LaFeO3 nanoparticles prepared via co-precipitation route. Rare Met. 37, 181–190 (2018). https://doi.org/10.1007/s12598-016-0707-6

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  • DOI: https://doi.org/10.1007/s12598-016-0707-6

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