Nanoscale ferroelectricity in pseudo-cubic sol-gel derived barium titanate - bismuth ferrite (BaTiO3- BiFeO3) solid solutions


Single phase barium titanateebismuth ferrite ((1-x)BaTiO3-(x)BiFeO3, BTO-BFO) solid solutions were prepared using citric acid and ethylene glycol assisted sol-gel synthesis method. Depending on the dopant content the samples are characterized by tetragonal, tetragonal-pseudocubic, pseudocubic and rhombohedral structure as confirmed by Raman spectroscopy and XRD measurements. An increase of the BFO content leads to a reduction in the cell parameters accompanied by a decrease in polar distortion of the unit cell wherein an average particle size increases from 60 up to 350 nm. Non zero piezoresponse was observed in the compounds with pseudocubic structure while no polar distortion was detected in their crystal structure using X-ray diffraction method. The origin of the observed non-negligible piezoresponse was discussed assuming a coexistence of nanoscale polar and non-polar phases attributed to the solid solutions with high BFO content. A coexistence of the nanoscale regions having polar and non-polar character is considered as a key factor to increase macroscopic piezoresponse in the related compounds due to increased mobility of the domain walls and phase boundaries. (c) 2020 Elsevier B.V. All rights reserved.




Chemistry; Materials Science; Metallurgy & Metallurgical Engineering


Pakalniskis, A; Lukowiak, A; Niaura, G; Gluchowski, P; Karpinsky, DV; Alikin, DO; Abramov, AS; Zhaludkevich, A; Silibin, M; Kholkin, AL; Skaudzius, R; Strek, W; Kareiva, A



The work has been done in frame of the project TransFerr. This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 778070. The scanning probe microscopy study was funded by RFBR (grant No. 19-52-04015) and BRFFR (grant No. F19RM-008). The equipment of the Ural Center for Shared Use Modern nanotechnology UrFU was used. Sample structural characterization was funded by RFBR (grant #18-38-20020 mol_a_ved). M.S. also acknowledges Russian academic excellence project 5-100 for Sechenov University. This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, refs. UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the FCT/MEC.

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