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    Structural, spectroscopic, and dielectric characterizations of Mn-doped 0.67BiFeO3-0.33BaTiO3 multiferroic ceramics

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    Type
    Article
    Authors
    Hang, Qiming
    Zhou, Wenke
    Zhu, Xinhua
    Zhu, Jianmin
    Liu, Zhiguo
    Al-Kassab, Tala'at
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2013-09-07
    Online Publication Date
    2013-09-07
    Print Publication Date
    2013-09
    Permanent link to this record
    http://hdl.handle.net/10754/550836
    
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    Abstract
    0.67BiFeO3-0.33BaTiO3 multiferroic ceramics doped with x mol% MnO2 (x = 2–10) were synthesized by solid-state reaction. The formation of a perovskite phase with rhombohedral symmetry was confirmed by X-ray diffraction (XRD). The average grain sizes were reduced from 0.80 μm to 0.50 μm as increasing the Mn-doped levels. Single crystalline nature of the grains was revealed by high-resolution transmission electron microscopy (HRTEM) images and electron diffraction patterns. Polar nano-sized ferroelectric domains with an average size of 9 nm randomly distributed in the ceramic samples were revealed by TEM images. Ferroelectric domain lamellae (71° ferroelectric domains) with an average width of 5 nm were also observed. Vibrational modes were examined by Raman spectra, where only four Raman peaks at 272 cm−1 (E-4 mode), 496 cm−1 (A 1-4 mode), 639 cm−1, and 1338 cm−1 were observed. The blue shifts in the E-4 and A 1-4 Raman mode frequencies were interpreted by a spring oscillator model. The dieletric constants of the present ceramics as a function of the Mn-doped levels exhibited a V-typed curve. They were in the range of 350–700 measured at 103 Hz, and the corresponding dielectric losses were in range of 0.43–0.96, approaching to 0.09 at 106 Hz.
    Citation
    Structural, spectroscopic, and dielectric characterizations of Mn-doped 0.67BiFeO3-0.33BaTiO3 multiferroic ceramics 2013, 2 (3):252 Journal of Advanced Ceramics
    Publisher
    Springer Nature
    Journal
    Journal of Advanced Ceramics
    DOI
    10.1007/s40145-013-0068-7
    Additional Links
    http://link.springer.com/10.1007/s40145-013-0068-7
    ae974a485f413a2113503eed53cd6c53
    10.1007/s40145-013-0068-7
    Scopus Count
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    Articles; Physical Science and Engineering (PSE) Division

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