Magnetoelectric Properties of Low Temperature Sintered CoFe2O4-(PZN-PZT) Multiferroic Composite Materials

doi:10.15541/jim20150548

Abstract

Abstract:

CoFe₂O₄-(PZN-PZT) multiferroic composite ceramics were prepared by low temperature sintering using traditional ceramic method. The influences of mixed mode, PZT shell and composition on structure, magnetic and magnetoelectric coupling properties were studied. XRD and TEM results show that CoFe₂O₄/PZT core-shell nanostructured particles are prepared by the Sol-Gel method. A 10-20 nm thick PZT shell formed on the surface of CoFe₂O₄ particle. EDS analyses show that low temperature sintering and barrier layer effectively inhibit the elements diffusion of the two phases. SEM images and magnetoelectric property measurement show that PZT shell coated on CoFe₂O₄ particles and the stirring process improve the magnetic particles content in com-position, match the sintering process perfectly, and improve the magnetoelectric coupling properties effectively. The coated and stirred sample CoFe₂O₄-(PZN-PZT) with volume ratio of 4:6 which sintered at 1000℃ show maximum magnetoelectric coupling coefficient of (18.3 mV/(cm·Oe)) at 10 kHz.

Key words: multiferroic, magnetoelectric coupling, core-shell structure, magnetic properties

CLC Number:

O469
O432

FAN Gui-Fen, XU Xing, WANG Kai, LV Wen-Zhong, LIANG Fei, JIN Shan-Long. Magnetoelectric Properties of Low Temperature Sintered CoFe₂O₄-(PZN-PZT) Multiferroic Composite Materials[J]. Journal of Inorganic Materials, 2016, 31(6): 561-566.

Figures/Tables 10

Fig. 1 XRD patterns of CFO powder and CFO/PZT powder. (a) Non-treated CFO; (b) Coated but non-calcined CFO/PZT; (c) Coated and calcined CFO/PZT

Fig. 2 TEM image of CFO/PZT powder coated after calcinations

Fig. 3 d33 of non-coated and grinded CFO/PZN-PZT composite ceramics with volume ratio of 2:8 sintered at different temperatures

Fig. 4 XRD patterns of non-coated and stirred CFO-(PZN- PZT) composite ceramics with different volume ratios of CFO. (a) 10%; (b) 20%; (c) 30%; (d) 40%; (e) 50%

Fig. 5 SEM imges of CFO-(PZN-PZT) composite ceramics section with volume ratio of 2:8. (a) Non-coated and grinded; (b) Non-coated and stirred; (c) Coated and stirred

Table 1 EDS analyses of CFO-(PZN-PZT) composite ceramics with volume ratio of 2:8

Element	O	Ti	Fe	Co	Zn	Zr	Nb	Pb
Red cross section in Figure 5 (a)/at%	68.48	2.47	12.38	7.26	3.49	1.52	1.93	2.46
Red cross section in Figure 5 (c)/at%	74.88	2.63	7.07	3.42	2.15	2.10	4.46	3.28

Fig. 6 d33 value as functions of CFO volume ratio in CFO- (PZN-PZT) composite ceramics prepared with different processes

Fig. 7 Hysteresis loops of CFO-(PZN-PZT) composite ceramics prepared with different processes. (a) Non-coated and stirred; (b) Volume ratio of 2:8

Fig. 8 Magnetic loops of CFO-(PZN-PZT) composite ceramics prepared with coating and stirring processes

Fig. 9 Magnetoelectric coupling coefficient curves of CFO- (PZN-PZT) composite multiferroic ceramics at 10 kHz with different process. (a) Coated and stirred; (b) Volume ratio of 2:8

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Magnetoelectric Properties of Low Temperature Sintered CoFe₂O₄-(PZN-PZT) Multiferroic Composite Materials

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