Accessory ligand strategies for hexacyanometallate networks deriving perovskite polycrystalline electromagnetic absorbents  

作　　者：Zhenguo Gao Zehao Zhao Di Lan Kaichang Kou Jiaoqiang Zhang Hongjing Wu 

机构地区：[1]School of Chemistry and Chemical Engineering,Northwestern Polytechnical University,Xi’an,710072,China [2]MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary,School of Physical Science and Technology,Northwestern Polytechnical University,Xi’an,710072,China

出　　处：《Journal of Materials Science & Technology》2021年第23期69-79,共11页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51872238,21806129 and 21673182);the Fundamental Research Funds for the Central Universities(Nos.3102018zy045 and 3102019AX11);the Natural Science Basic Research Plan in Shaanxi Province of China(Nos.2020JM-118 and 2017JQ5116);support from The Analytical&Testing Center of Northwestern Polytechnical University。

摘　　要：The controllable adjustment of electromagnetic(EM)properties for high-efficiency EM absorbents are indispensable,nonetheless,rare in crystals engineering regulation.Herein,for the first time,regulated amount of sodium citrate was employed as accessory ligand of cobalt cation in aqueous solution to kinetically assist the controllable fabrication of Prussian blue analogs(PBAs)and corresponding lanthanide perovskite hybrid Co Fe alloy polycrystals.Especially,the multi-phase features were analyzed based on Rietveld refinement of XRD patterns,illustrating the existence of distortions,defects and heterogeneous interfaces in resultant polycrystals.Benefited to the dielectric and magnetic adjustment,polycrystalline absorbents achieved excellent impedance matching and EM attenuation,as the minimum reflection loss of Co Fe/La FeO_(3)and Co Fe/La FeO_(3)/La_(2)O_(3)reached-44.13 and-33.95 d B,ranking broadest effective bands up to 4.88 and 3.36 GHz.The validity of the strategy provided a novel sight into the controllable fabrication of high-performance magnetic semiconductor polycrystalline devices.

关 键 词：Sodium citrate Prussian blue analogs POLYCRYSTALLINE Electromagnetic absorption Interfacial polarization 

分 类 号：TB34[一般工业技术—材料科学与工程]