文献类型：期刊文献

英文题名：Multiple dielectric relaxations and superior sonocatalysis of bismuth iron niobate pyrochlores via high-level Co-doping

作者：Sun, Shujie[1];Liu, Zhen[1];Ti, Ruixia[2];Li, Yuan[1];Cheng, Nian[1];Tian, Yongshang[3];Yin, Xiaofeng[1]

第一作者：Sun, Shujie

通讯作者：Sun, SJ[1];Yin, XF[1]

机构：[1]Xinyang Normal Univ, Collaborat Innovat Ctr Henan Prov Energy Saving B, Xinyang 464000, Peoples R China;[2]Xinxiang Univ, Coll Phys & Elect Engn, Xinxiang 453003, Henan, Peoples R China;[3]Xinyang Normal Univ, Coll Chem & Chem Engn, Henan Key Lab Utilizat Nonmetall Mineral South He, Xinyang 464000, Peoples R China

第一机构：Xinyang Normal Univ, Collaborat Innovat Ctr Henan Prov Energy Saving B, Xinyang 464000, Peoples R China

通讯机构：[1]corresponding author), Xinyang Normal Univ, Collaborat Innovat Ctr Henan Prov Energy Saving B, Xinyang 464000, Peoples R China.

年份：2021

卷号：47

期号：5

起止页码：6049-6058

外文期刊名：CERAMICS INTERNATIONAL

收录：;EI(收录号：20204409433944);Scopus(收录号：2-s2.0-85094612926);WOS:【SCI-EXPANDED(收录号:WOS:000615087900004)】；

基金：The authors gratefully acknowledge the supports of the National Natural Science Foundation of China (51702276), the Science and Technology Research Project of Henan Province (182102210133,192102210206,202102210001), and the Key Research Programme of University in Henan Province (18A140030, 19A430021) and the Nanhu Scholars Programme for Young Scholars of XYNU.

语种：英文

外文关键词：Pyrochlore; Magnetodielectric effect; Dielectric relaxation; Sonocatalysis; Co-doping

摘要：Manipulating the structure of Bi-based pyrochlores can produce excellent physicochemical properties and novel phenomena due to lattice disorders and distortions. Herein, bismuth iron niobate pyrochlores via high-level Co-doping were successfully fabricated by a sol-gel auto-combustion method and the doping effects on their structural, magnetic, dielectric and sonocatalytic properties were systematically investigated. Rietveld refinements revealed substituting Fe sites with Co ions (at a ratio of 30%-80%) can maintain the pyrochlore phase and induce larger lattice distortion. New dielectric relaxation and outstanding magneto-dielectric effect with a maximal 4% coefficient were clearly observed in the heavily Co-doped sample at low temperatures, which correlate with structural disorder and magnetic state transitions. New types of dielectric anomalies that gradually change the relative permittivity but maintain the dielectric loss almost constant with increasing temperature or frequency and can be tuneable at different doping levels were first observed above room temperature. The activation of ultrasonic vibration-driven degradation in the specimens was evaluated by the catalytic oxidation of dye, and the Fe/Co-coexisting catalysts exhibited superior sonocatalytic activity with magnetic recyclability, opening up a new pathway of developing feature-rich pyrochlores in the catalytic field.