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Strong magnetic properties and enhanced coupling effect by tailoring the molar ratio in BaTiO3/Co0.5Mg0.3Zn0.2Fe2O4 composite ceramics

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Abstract

BTO/CMZFO composite ceramics with different molar ratios (the molar of BTO to that of CMZFO) (3:1, 2:1, 1:1, 1:2, 1:3) were prepared by conventional solid state reaction method. Effects of molar ratio on the dielectric, magnetic properties and coupling effect were investigated. The results indicate that the ceramics show bi-phase composite structure, without any obvious impurities can be found. The grain size can be categorized into two types, one is BTO with the grain size of 2–3 μm while the other one is CMZFO with the size less than 0.5 μm. The dielectric constant of all the composites is less than 500 in the frequency range from 20 to 2 MHz, and it decreases with decreasing the molar ratio while the dielectric loss shows the opposite behavior. The frequency stability of dielectric constant decreases with the addition of CMZFO due to the increased relaxation polarization. The dielectric constant and loss present non-monotonic dependence on the molar ratio, one or more relaxation peaks can be found. With the reduction of molar ratio, the height of the relaxation peak decreases and the position of the relaxation peak shifts to lower temperature. The remnant polarization (Pr) range is from 2 to 7.5 μC/cm2, it decreases first and then increases with the molar ratio, this non-monotonic transition can be attributed to the combined action of ferroelectric phase and leakage current. The magnetization decreases and then increases with the diminution of molar ratio, the largest remnant magnetization (Mr) of the composites is 31.52 emu/g when the ratio is 1:3. The largest effective magnetization of CMZFO component in the composite is 84.855 emu/g for the specimen with the molar ratio 2:1, which is due to the strongest interface interaction between the two phases compared with other samples. The coupling coefficient increases rapidly and then decreases slowly with the applied magnetic field, and the maximum coupling coefficient is near 1.2 mV/cmOe, which is obtained at about 2 kOe in the sample with the molar ratio 1:3.

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Acknowledgement

This work has been supported by the Chongqing Research Program of Basic Research and Frontier Technology (CSTC2018jcyjAX0416, CSTC2016jcyjA0175, CSTC2016jcyjA0349), the Scientific and Technological Research Young Program of Chongqing Municipal Education Commission (KJQN201801509), the Excellent Talent Project in University of Chongqing (Grant No. 2017-35), the Science and Technology Innovation Project of Social Undertakings and Peoples Livelihood Guarantee of Chongqing (Grant No. cstc2017shmsA0192), the Program for Innovation Teams in University of Chongqing, China (Grant No. CXTDX201601032), the Leading Talents of Scientific and Technological Innovation in Chongqing (CSTCCXLJRC201919), the Program for Technical and Scientific Innovation Led by Academician of Chongqing, the Latter Foundation Project of Chongqing University of Science & Technology (CKHQZZ2008002), and the Scientific & Technological Achievements Foundation Project of Chongqing University of Science & Technology (CKKJCG2016328).

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Authors and Affiliations

  1. School of Materials and Engineering, Panzhihua University, Panzhihua, 617000, China

    Lang Bai

  2. School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China

    Rongli Gao, Zhenhua Wang, Chunlin Fu, Gang Chen, Xiaoling Deng, Xiaodong Luo & Wei Cai

  3. Chongqing Key Laboratory of Nano/Micro Composite Materials and Devices, Chongqing, 401331, China

    Rongli Gao, Zhenhua Wang, Chunlin Fu, Gang Chen, Xiaoling Deng, Xiaodong Luo & Wei Cai

  4. School of Applied Science, Taiyuan University of Science and Technology, Taiyuan, 030024, China

    Qingmei Zhang

  5. National Institute of Metrology, Beijing, 100029, China

    Zhiyi Xu

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  1. Lang Bai
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Bai, L., Gao, R., Zhang, Q. et al. Strong magnetic properties and enhanced coupling effect by tailoring the molar ratio in BaTiO3/Co0.5Mg0.3Zn0.2Fe2O4 composite ceramics. J Mater Sci: Mater Electron 30, 11563–11575 (2019). https://doi.org/10.1007/s10854-019-01513-8

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