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Issue 18, 2014
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Novel behaviors of multiferroic properties in Na-Doped BiFeO3 nanoparticles

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Abstract

Highly aliovalent Na1+ ions were selected as the dopant to substitute Bi3+ ions in BiFeO3 (BFO) and Bi1−xNaxFeO3 (x = 0, 0.01, 0.03, 0.05) nanoparticles prepared via a facile sol–gel method. Weak ferromagnetism and an obvious exchange bias (EB) phenomenon without field cooling were observed in the samples. To establish the presence of EB in the nanoparticles, training effect (TE) data were analyzed using Binek's model. Moreover, with the increase in Na1+ content, the band gap was decreased, while interestingly, the leakage current density was significantly reduced and the smallest leakage current density (∼10−7 A cm−2) was observed for the 3% Na-doped BFO. The electrical conduction mechanism of samples was investigated by plotting log J versus log E. Oxygen vacancies decreased with the increase of Na content analyzed through X-ray photoelectron spectroscopy (XPS) measurements. To further explain the decrease of band gap and leakage current density with the increase of Na content, the interplay of oxygen vacancies and holes was analyzed and a phenomenological qualitative model based on the electronic energy band proposed.

Graphical abstract: Novel behaviors of multiferroic properties in Na-Doped BiFeO3 nanoparticles

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Publication details

The article was received on 11 May 2014, accepted on 18 Jul 2014 and first published on 24 Jul 2014


Article type: Paper
DOI: 10.1039/C4NR02557A
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Nanoscale, 2014,6, 10831-10838

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    Novel behaviors of multiferroic properties in Na-Doped BiFeO3 nanoparticles

    H. Zhang, W. Liu, P. Wu, X. Hai, M. Guo, X. Xi, J. Gao, X. Wang, F. Guo, X. Xu, C. Wang, G. Liu, W. Chu and S. Wang, Nanoscale, 2014, 6, 10831
    DOI: 10.1039/C4NR02557A

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