Atomic-resolution characterization on the structure of strontium doped barium titanate nanoparticles  

作　　者：Haoyu Jiang Jizhen Qi Dongchang Wu Wei Lu Jiahui Qian Haifeng Qu Yixiao Zhang Pei Liu Xi Liu Liwei Chen 

机构地区：[1]In-situ Center for Physical Sciences,School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai,200240,China [2]i-Lab,CAS Center for Excellence in Nanoscience Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO),Chinese Academy of Sciences,Suzhou,215123,China [3]Suzhou Bao Shun Mei Technology Co.,Ltd.,Room 305,Building 11,99 Jinji Lake Avenue,Suzhou Industrial Park,Suzhou,215123,China [4]DTU Nanolab,Technical University of Denmark,Fysikvej,Building 307,2800,Lyngby,Denmark [5]Shanghai Nanoport,Thermo Fisher Scientific Building A,2517 Jinke Road,Pudong District,Shanghai,201203,China

出　　处：《Nano Research》2021年第12期4802-4807,共6页纳米研究（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.21625304,21872163,21991153,22072090,21991153,and 21991150);L.C.acknowledges the support from the Ministry of Science and Technology(No.2016YFA0200703);P.L.acknowledges the financial support from the Carlsberg Foundation.

摘　　要：Ferroelectric barium titanate nanoparticles(BTO NPs)may play critical roles in miniaturized passive electronic devices such as multi-layered ceramic capacitors.While increasing experimental and theoretical understandings on the structure of BTO and doped BTO have been developed over the past decade,the majority of the investigation was carried out in thin-film materials;therefore,the doping effect on nanoparticles remains unclear.Especially,doping-induced local composition and structure fluctuation across single nanoparticles have yet to be unveiled.In this work,we use electron microscopy-based techniques including high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM),integrated differential phase contrast(iDPC)-STEM,and energy dispersive X-ray spectroscopy(EDX)mapping to reveal atomically resolved chemical and crystal structure of BTO and strontium doped BTO nanoparticles.Powder X-ray diffraction(PXRD)results indicate that the increasing strontium doping causes a structural transition from tetragonal to cubic phase,but the microscopic data validate substantial compositional and microstructural inhomogeneities in strontium doped BTO nanoparticles.Our work provides new insights into the structure of doped BTO NPs and will facilitate the materials design for next-generation high-density nano-dielectric devices.

关 键 词：barium titanate nanoparticles doping effect structural transition high-angle annular dark-field scanning transmission electron microscopy integrated differential phase contrast 

分 类 号：TB383[一般工业技术—材料科学与工程]