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

JOURNAL OF ALLOYS AND COMPOUNDS

卷:830

Article

Pakalniskis, A.¹  Lukowiak, A.²  Niaura, G.³  Gluchowski, P.^2,4  Karpinsky, D. V.^5,6  Alikin, D. O.^8,9,10  Abramov, A. S.⁸  Zhaludkevich, A.⁵  Silibin, M.^6,7  Kholkin, A. L.^8,9,10  Skaudzius, R.¹  Strek, W.²  Kareiva, A.¹ 

[1] Vilnius Univ, Inst Chem, Naugarduko 24, LT-03225 Vilnius, Lithuania

[2] Polish Acad Sci, Inst Low Temp & Struct Res, Okolna 2, PL-50422 Wroclaw, Poland

[3] Vilnius Univ, Fac Phys, Inst Chem Phys, Sauletekio Ave 9, LT-10222 Vilnius, Lithuania

[4] Nanoceram Spolka Akcyjna, Okolna 2, PL-50422 Wroclaw, Poland

[5] NAS Belarus, Sci Pract Mat Res Ctr, Minsk 220072, BELARUS

[6] Natl Res Univ Elect Technol MIET, Moscow 124498, Russia

[7] IM Sechenov First Moscow State Med Univ, Inst Bion Technol & Engn, Moscow 119991, Russia

[8] Ural Fed Univ, Sch Nat Sci & Math, Ekaterinburg, Russia

[9] Univ Aveiro, Dept Phys, Aveiro, Portugal

[10] Univ Aveiro, CICECO Aveiro Inst Mat, Aveiro, Portugal

关键词: BTO-BFO;    Solid solutions;    Sol-gel processing;    Phase diagram;    PFM;    SEM;   

DOI  :  10.1016/j.jallcom.2020.154632

来源: Elsevier

【 摘 要 】

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.

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