Effect of volume fraction on magnetoelectric coupling effect of Co0.1Cu0.9Fe2O4/Ba0.8Sr0.2TiO3 composite liquid
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Co0.1Cu0.9Fe2O4 (CCFO) and Ba0.8Sr0.2TiO3 (BST) particles were respectively prepared by chemical coprecipitation and hydrothermal method, then CCFO/BST composite liquid was synthesized by distributing surface modified CCFO and Ba0.8Sr0.2TiO3 particles into insulating silicone oil. Effects of volume fraction (ϕv = 1%, 2%, 5% and 10%) on the microstructure, dielectric, ferroelectric and magnetoelectric coupling effect were comparatively investigated. XRD showed that the pure phase of CCFO and BST particles was successfully prepared. CCFO/BST composite particle shows ferromagnetic behavior due to the contribution of magnetic phase CCFO. The dielectric constant of CCFO/BST composite liquid is about 1/25 of the composite particles, and the dielectric constant value of the composite liquid decreases with increasing the volume fraction because the permittivity of silicone oil is far smaller than that of CCFO/BST composite particles. The relative change of dielectric constant of composite liquid under the action of external magnetic field is greater than that of composite particle due to its mobility of particles in liquid. The values of remnant polarization (Pr), coercive field (Ec) and leakage current of CCFO/BST composite liquid increase monotonically with increasing volume fraction, while excessive volume fraction may result in abnormal phenomenon because of the agglomeration of particles. Magnetic field-induced chain structure of the composite liquid has been observed under a light microscope at a magnification of 200. The maximal magnetoelectric (ME) coupling coefficient is about 89.78 V/(cm Oe), which is obtained in the CCFO/BST composite liquid when the volume fraction is 10%.
KeywordsVolume fraction Magnetoelectric coupling effect Composite liquid Chain structure Rotation
The present work has been supported by the Chongqing Research Program of Basic Research and Frontier Technology (CSTC2018jcyjAX0416, CSTC2019jcyj-msxmX0071), the Science and Technology Research Program of Chongqing Municipal Education Commission (KJZD-M201901501), the Scientific and Technological Research Young Program of Chongqing Municipal Education Commission (KJQN201801509, KJQN20190150), the Program for Creative Research Groups in University of Chongqing (Grant No. CXQT19031), the Innovation Program for Chongqing's Overseas Returnees (cx2019159), 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 (cstc2017shmsA90015), the Program for Innovation Teams in University of Chongqing, China (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), the Postgraduate technology innovation project of Chongqing University of Science & Technology (YKJCX1820205, YKJCX1820214, YKJCX1920203), the 9th Chongqing KeHui graduate student innovation and entrepreneurship competition (09111260) and the student innovating projects of science of Chongqing (201811551014).
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