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Issue 11, 2018
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Bi3.25La0.75Ti2.5Nb0.25(Fe0.5Co0.5)0.25O12, a single phase room temperature multiferroic

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Multiferroics (MFs) have attracted great research interest due to the coexistence of ferroelectric and magnetic ordering, as well as magnetoelectric (ME) coupling. At present, there is a very limited number of single-phase MFs known and these are still far from practical applications. In single-phase MFs, the simultaneous presence of electric and magnetic dipoles does not guarantee strong (ME) coupling, as the microscopic mechanisms of ferroelectricity and magnetism are quite different and do not intrinsically interact with each other. Here we show that in the ceramic system, Bi3.25La0.75Ti3−2xNbx(Fe0.5Co0.5)xO12, the x = 0.25 composition is ferroelectrically and ferromagnetically active at room temperature. A single-phase structure is supported by XRD, SEM/EDX and neutron diffraction data. Clear ME couplings were observed in this single-phase material at room temperature, where the magnetic iron and cobalt ions contribute to ferroelectric polarization and magnetic moment simultaneously. The results of structural, electrical and magnetic measurements are supported by first principle calculations. This material represents one of the first truly single phase bulk ceramics that exhibits multiferroic behaviour at room temperature and its discovery will help to guide the design of room temperature single-phase MFs with strong ME coupling for sensors and solid-state memory applications.

Graphical abstract: Bi3.25La0.75Ti2.5Nb0.25(Fe0.5Co0.5)0.25O12, a single phase room temperature multiferroic

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Publication details

The article was received on 10 Jan 2018, accepted on 19 Feb 2018 and first published on 19 Feb 2018

Article type: Paper
DOI: 10.1039/C8TC00161H
Citation: J. Mater. Chem. C, 2018,6, 2733-2740

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    Bi3.25La0.75Ti2.5Nb0.25(Fe0.5Co0.5)0.25O12, a single phase room temperature multiferroic

    Z. Li, K. Tao, J. Ma, Z. Gao, V. Koval, C. Jiang, G. Viola, H. Zhang, A. Mahajan, J. Cao, M. Cain, I. Abrahams, C. Nan, C. Jia and H. Yan, J. Mater. Chem. C, 2018, 6, 2733
    DOI: 10.1039/C8TC00161H

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