Journal of Inorganic Materials ›› 2024, Vol. 39 ›› Issue (1): 99-106.DOI: 10.15541/jim20230278
• RESEARCH LETTER • Previous Articles Next Articles
DAI Le1(), LIU Yang1, GAO Xuan1, WANG Shuhao1, SONG Yating1, TANG Mingmeng1, DMITRY V Karpinsky2, LIU Lisha1(), WANG Yaojin1()
Received:
2023-06-12
Revised:
2023-08-07
Published:
2024-01-20
Online:
2023-10-07
Contact:
WANG Yaojin, professor. E-mail: yjwang@njust.edu.cn;About author:
DAI Le (1998-), female, Master candidate. E-mail: DL_2323@163.com
Supported by:
CLC Number:
DAI Le, LIU Yang, GAO Xuan, WANG Shuhao, SONG Yating, TANG Mingmeng, DMITRY V Karpinsky, LIU Lisha, WANG Yaojin. Self-polarization Achieved by Compositionally Gradient Doping in BiFeO3 Thin Films[J]. Journal of Inorganic Materials, 2024, 39(1): 99-106.
Fig. 1 (a-c) Schematic drawings of structures; Ferroelectric domains illustrating (d) up-graded film, (e) down-graded film and (f) BFO thin film; Schematic diagrams of crystal structures of BFO films (g) before and (h, i) after doping
Fig. 2 Structures and cross section morphologies of thin films (a) XRD patterns and SEM images of (b) up-graded films and (f) down-graded films. Bismuth, iron and calcium mappings of (c-e) up-graded BFO films and (g-i) down-graded BFO films
Fig. 3 Surface morphologies and domain structures of thin films (a-c) AFM images, (d-f) out-of-plane PFM images, (g-i) accordingly asymmetric phase and amplitude loops versus tip bias voltage of (a, d, g) up-graded films, (b, e, h) down-graded films and (c, f, i) BFO films
Fig. 4 J-V characteristics of thin films (a) Up-graded BFO films and down-graded BFO films; (b) BCFO (x=0, 0.05, 0.10, 0.15, 0.20) films; Colorful figures are available on website
Fig. 5 Ferroelectric properties of BFO compositionally graded films (a) Up-graded films; (b) Down-graded films; (c) BFO thin films; (d) Three kinds of films at the electric field intensity of 1500 kV/cm; (e) Remanent polarization, Pr and (f) coercive field, Ec changed with applied voltage; Colorful figures are available on website
Fig. 6 Valence analysis of thin films Narrow scan spectra of thin films: (a) O1s, (b) Fe2p, and (c) Ca2p of Bi1-xCaxFeO3 samples with x=0, 0.05, 0.10, 0.15 and 0.20; (d) Ratio of Fe3+/Fe2+ and (e) percentage of the oxygen vacancy concentration of BFCO with the increase of x
Fig. S2 Ferroelectric properties of Bi1-xCaxFeO3 films (a) x=0; (b) x=0.05; (c) x=0.10; (d) x=0.15; (e) x=0.20; (f) The remanent polarization Pr, the coercive field Ec measured under the electric field intensity of 1800 kV·cm-1
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