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Crystals 2017, 7(3), 76; doi:10.3390/cryst7030076

Cobalt-Substituted Seven-Layer Aurivillius Bi8Fe4Ti3O24 Ceramics: Enhanced Ferromagnetism and Ferroelectricity

1,6
,
1
,
1
,
1,3,4,* , 1
and
1,2,3,4,5,*
1
CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
2
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China
3
Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
4
Hefei Physical Sciences and Technology Center, CAS Hefei Institutes of Physical Sciences, Hefei 230031, China
5
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, China
6
Patent Examination Cooperation Sichuan Center of the Patent Office, Chengdu 610213, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Iwan Kityk
Received: 12 January 2017 / Revised: 28 February 2017 / Accepted: 1 March 2017 / Published: 8 March 2017
(This article belongs to the Special Issue Multiferroics Crystals)
View Full-Text   |   Download PDF [1868 KB, uploaded 8 March 2017]   |  

Abstract

In this work, Aurivillius-phase Bi8Fe4-xCoxTi3O24 (7-BFCT, 0 ≤ x ≤ 0.4) powders and ceramics were successfully prepared by the combination of citrate combustion and hot-press methods. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) indicate a successful synthesis of the pure phase of the 7-BFCT ceramics, and all the samples showed a good seven-layer structure of the Aurivillius phase. Partial Fe substituted by Co was found to be effective to enhance both ferromagnetic and ferroelectric properties at room temperature, and the largest remnant magnetization (2Mr) of ~0.69 emu/g was revealed at the composition of x = 0.4. Zero field cooling and field cooling (ZFC-FC) magnetization measurement confirmed its magnetic transition occurring at a high temperature of ~750 K. Correspondingly, the enhanced ferroelectric properties of such Co-substituted ceramics were also investigated. View Full-Text
Keywords: Aurivillius; ceramics; multiferroic; hot press Aurivillius; ceramics; multiferroic; hot press
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Lei, Z.; Chen, T.; Li, W.; Liu, M.; Ge, W.; Lu, Y. Cobalt-Substituted Seven-Layer Aurivillius Bi8Fe4Ti3O24 Ceramics: Enhanced Ferromagnetism and Ferroelectricity. Crystals 2017, 7, 76.

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