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《Journal of Hubei University(Natural Science)》 2018-01
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Structure and piezoelectric properties of epitaxial BiFeO_3 thin films modulated by strain

YE Ang;ZHOU Peng;LIU Ying;LIANG Kun;ZHANG Tianjin;QI Yajun;Faculty of Materials Science and Engineering,Hubei University;  
Epitaxial BiFeO_3thin films of various strain states were grown on Nb-SrTiO_3substrate by pulsed laser deposition,the strain effects on crystal structure and piezoelectric properties of thin films had been investigated.X-ray diffraction results showed that BiFeO_3thin films were epitaxially grown along the substrate orientation.The outof-plane strain in BiFeO_3thin films decreased from 2.778%to 2.045%with the increase of thickness,BiFeO_3thin films also evolved from full strained to a partially relaxed one.Piezoresponse force microscopy measurements revealed that all the as-grown BiFeO_3thin films possessed high piezoelectric response and the piezoelectric coefficient d_(33)decreased from 259 pm/V to 136 pm/V with the decrease of the film thickness.
【CateGory Index】: O484
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