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Ceramics of Bi0.9Ba0.1Fe0.925TixO3 (x = 0.0625, 0.08125, 0.0875, and 0.11) were prepared according to two doping strategies: one is called single-step doping in which Ba and Ti were doped together in calcination, while the other one is called two-step doping in which Ba and Ti were doped in calcination and sintering, respectively. Compared with samples prepared with single-step doping, those prepared with two-step doping have obviously different XRD patterns and small grains, and are dramatically improved in dielectric loss, resistivity, and remnant magnetization. A low dielectric loss of 0.05 at 103 Hz, a high resistivity of 4×1012 Ω·cm, and a large remnant magnetization of 1.5 emu/g, have been obtained simultaneously for Bi0.9Ba0.1Fe0.925Ti0.11O3 prepared with two-step doping. The contrast between these two doping strategies clearly reveals the importance of establishing a proper doping strategy when two or more elements are co-doped to BiFeO3.


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Effects of Ba and Ti co-doping on BiFeO3 multiferroic ceramics optimized through two-step doping

Show Author's information Sheng ZHUaYanhong GUbYao XIONGaXi ZHOUaYong LIUaYu WANGcWanping CHENa( )
Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan, Hubei 430072, China
School of Physics and Electronic Information, Luoyang Normal College, Luoyang, Henan 471022, China
School of Materials Science and Engineering, Nanchang University, Nanchang, Jiangxi 330031, China

Abstract

Ceramics of Bi0.9Ba0.1Fe0.925TixO3 (x = 0.0625, 0.08125, 0.0875, and 0.11) were prepared according to two doping strategies: one is called single-step doping in which Ba and Ti were doped together in calcination, while the other one is called two-step doping in which Ba and Ti were doped in calcination and sintering, respectively. Compared with samples prepared with single-step doping, those prepared with two-step doping have obviously different XRD patterns and small grains, and are dramatically improved in dielectric loss, resistivity, and remnant magnetization. A low dielectric loss of 0.05 at 103 Hz, a high resistivity of 4×1012 Ω·cm, and a large remnant magnetization of 1.5 emu/g, have been obtained simultaneously for Bi0.9Ba0.1Fe0.925Ti0.11O3 prepared with two-step doping. The contrast between these two doping strategies clearly reveals the importance of establishing a proper doping strategy when two or more elements are co-doped to BiFeO3.

Keywords:

BiFeO3, doping, multiferroic, nonstoichiometric
Received: 29 February 2016 Revised: 19 April 2016 Accepted: 06 May 2016 Published: 27 June 2016 Issue date: September 2016
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Publication history

Received: 29 February 2016
Revised: 19 April 2016
Accepted: 06 May 2016
Published: 27 June 2016
Issue date: September 2016

Copyright

© The author(s) 2016

Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. J1210061) and the National High-tech R&D Program of China (No. 2013AA031903).

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