Morphotropic phase boundary in Sm-substituted BiFeO3 ceramics: Local vs microscopic approaches

JOURNAL OF ALLOYS AND COMPOUNDS

卷:875

Article

Pakalniskis, A.¹  Skaudzius, R.¹  Zhaludkevich, D. V.²  Zhaludkevich, A. L.²  Alikin, D. O.³  Abramov, A. S.³  Murauskas, T.¹  Shur, V. Ya.³  Dronov, A. A.⁴  Silibin, M. V.^4,5,6  Selskis, A.⁷  Ramanauskas, R.⁷  Lukowiak, A.⁸  Strek, W.⁸  Karpinsky, D. V.^2,9  Kareiva, A.¹ 

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

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

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

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

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

[6] Sci Mfg Complex Technol Ctr, Moscow 124498, Russia

[7] Ctr Phys Sci & Technol, LT-02300 Vilnius, Lithuania

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

[9] South Ural State Univ, Chelyabinsk 454080, Russia

关键词: Sol-gel processing;    Morphotropic phase boundary;    XRD, TEM, SEM, PFM;   

DOI  :  10.1016/j.jallcom.2021.159994

来源: Elsevier

【 摘 要 】

Samarium substituted bismuth ferrite (BiFeO3) ceramics prepared by sol-gel synthesis method were studied using both local scale and microscopic measurement techniques in order to clarify an evolution of the crystal structure of the compounds across the morphotropic phase boundary region. X-ray diffraction analysis, transmission and scanning electron microscopies, XPS, EDS/EDX experiments and piezoresponse force microscopy were used to study the structural transitions from the polar active rhombohedral phase to the anti-polar orthorhombic phase and then to the non-polar orthorhombic phase, observed in the Bi1-xSmxFeO3 compounds within the concentration range of 0.08 <= x <= 0.2. The results obtained by microscopic techniques testify that the compounds in the range of 0.12 <= x <= 0.15 are characterized by two phase structural state formed by a coexistence of the rhombohedral and the anti-polar orthorhombic phases; two phase structural state observed in the compounds with 0.15 < x < 0.18 is associated with a coexistence of the anti-polar orthorhombic and the non-polar orthorhombic phases. Local scale measurements have revealed a notable difference in the concentration range ascribed to the morphotropic phase boundary estimated by microscopic measurements, the obtained results testify a wider concentration range ascribed to a coexistence of different structural phases, the background of the mentioned difference is discussed. (C) 2021 Elsevier B.V. All rights reserved.

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