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Procedia Engineering 27 (2012) 604 609
1877-7058 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Chinese Materials Research Societydoi:10.1016/j.proeng.2011.12.494
Available online at www.sciencedirect.com
Procedia
Engineering Procedia Engineering 00 (2011) 000000
www.elsevier.com/locate/procedia
2011 Chinese Materials Conference
Synthesis of CoFe2O4/BaTiO3 core-shell composite nanoparticles
Weipeng Wanga,b, Hua Yanga,b,*, Tao Xiana,b aState Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050,
Peoples Republic of China bSchool of Science, Lanzhou University of Technology, Lanzhou 730050, Peoples Republic of China
Abstract
It is important to prepare ideal 0-3 type magnetoelectric nanocomposites for promoting the multiferroic technological applications; however, the processing technology has become a big challenge. The key point to achieve the synthesis of 0-3 type magnetoelectric composites is the creation of ferromagnetic/ferroelectric composite nanoparticles with core-shell structure. In this work, core-shell structured CoFe2O4/BaTiO3 nanoparticles were synthesized in two steps. CoFe2O4 nanoparticles were firstly prepared through a polyacrylamide gel method, and then were coated with BaTiO3 layers using the same gel route. It is demonstrated that the as-prepared composite particles are an evident core-shell structure, where the core and the shell are determined to be CoFe2O4 and BaTiO3, respectively. The composite particles are nearly spherical in shape with a narrow particle size distribution. 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Chinese Materials Research Society Keywords: CoFe2O4/BaTiO3 composite particles; core-shell structure; polyacrylamide gel method
- CoFe2O4/BaTiO3 a,b a,b,* a,b
a 730050 b 730050
* Corresponding author. Tel.: +86-931-2973783; fax: +86-931-2976040. E-mail address: [email protected].
2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Chinese Materials Research Society Open access under CC BY-NC-ND license.
Open access under CC BY-NC-ND license.
http://creativecommons.org/licenses/by-nc-nd/3.0/http://creativecommons.org/licenses/by-nc-nd/3.0/

605Weipeng Wang et al. / Procedia Engineering 27 (2012) 604 6092 W. P. Wang, et al. / Procedia Engineering 00 (2011) 000000
0-3 -/ 0-3 - CoFe2O4/BaTiO3 CoFe2O4 CoFe2O4 BaTiO3 - CoFe2O4 BaTiO3 CoFe2O4/BaTiO3-
1.
[1][2-4][5-6][7-8][9-10] [11]
[12-13] 0-3 0-3 0-3 1000 [14-15]
0-3 ()/() 0-3 -/ 0-3 CoFe2O4 BaTiO3- CoFe2O4/BaTiO3
2.
2.1. CoFe2O4
Fe3+ Co2+ 2:1 Fe(NO3)39H2O Co(NO3)26H2O EDTA ( 1.5:1)( 20g/100 mL)( 9:1)pH2 80 120 24 h 10 /min 700 3 hCoFe2O4
2.2. (1x)CoFe2O4 / xBaTiO3

606 Weipeng Wang et al. / Procedia Engineering 27 (2012) 604 609 W. P. Wang, et al. / Procedia Engineering 00 (2011) 000000 3
CoFe2O4 Ba2+ Ti4+ 1:1 Ba(NO3)2 (C16H36O4Ti)( 2:1)( 20g/100 mL) CoFe2O4( 9 ) 80 120 24 h 700 5h 10 /minBaTiO3 CoFe2O4 - BaTiO3 (1x)CoFe2O4/xBaTiO3 (x=0, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 1)
2.3.
Bruker D8 advanced X (XRD) JEOL JEM-2010 (TEM)X (EDX)
3.
3.1. XRD
1 (1x)CoFe2O4/xBaTiO3 (x=0, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 1)XRD CoFe2O4 BaTiO3 (1x)CoFe2O4/xBaTiO3 CoFe2O4 BaTiO3
1 (1x)CoFe2O4/xBaTiO XRD
Fig. 1. XRD patterns of the (1x)CoFe2O4/xBaTiO3 composite nanopowders

0.2x0.8 x BaTiO3 CoFe2O4 XRD BaTiO3 CoFe2O4
3.2. TEM EDX
2(a) 2(b)(1x)CoFe2O4/xBaTiO3 (x=0.5) TEM 2(a) 40 nm 2(b)-- 2(c) 2(d)(B )(A ) EDX CoFeBaTi O BaTi O Cu Cu XRD BaTiO3 CoFe2O4-
2 (a)(b) CoFe2O4/BaTiO3 TEM (c)(d) (b)(B )(A) EDX
Fig. 2. (a)(b) TEM micrographs of CoFe2O4/BaTiO3 composite particles; (c)(d) EDX spectra obtained from the core region (spot B) and the shell layer (spot A) of a composite particle in (b)

608 Weipeng Wang et al. / Procedia Engineering 27 (2012) 604 609 W. P. Wang, et al. / Procedia Engineering 00 (2011) 000000 5
3.3.
BaTiO3 CoFe2O4 / 0-3 3(a)-/ 3(b) 0-3 0-3 -/ 0-3
3 (a) -/(b) 0-3
Fig. 3. (a) Sketch map of core-shell ferromagnetic/ferroelectric composite nanoparticle; (b) Sketch map of ideal 0-3 type magnetoelectric composite
4.
- CoFe2O4/BaTiO3 CoFe2O4 BaTiO3 40 nmCoFe2O4 BaTiO3-/ 0-3
(50962009)(209130)(1010RJZA041)(Q200902)

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