Structural, spectroscopic, and dielectric characterizations of Mn-doped 0.67BiFeO<sub>3</sub>–0.33BaTiO<sub>3</sub> multiferroic ceramics

doi:10.1007/s40145-013-0068-7

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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 (A₁-4 mode), 639 cm^-1, and 1338 cm^-1 were observed. The blue shifts in the E-4 and A₁-4 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.

Key words： multiferroic ceramics dielectric properties Raman spectra microstructure

Received: 18 February 2013 Published: 10 September 2015

Corresponding Authors: Xinhua ZHU

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	Qiming HANG
	Wenke ZHOU
	Xinhua ZHU
	Jianmin ZHU
	Zhiguo LIU
	Talaat AL-KASSAB

Cite this article:

Qiming HANG,Wenke ZHOU,Xinhua ZHU, et al. Structural, spectroscopic, and dielectric characterizations of Mn-doped 0.67BiFeO₃–0.33BaTiO₃ multiferroic ceramics[J]. Journal of Advanced Ceramics, 2013, 2(3): 252-259.

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http://jac.tsinghuajournals.com/EN/10.1007/s40145-013-0068-7 OR http://jac.tsinghuajournals.com/EN/Y2013/V2/I3/252

XRD patterns of the 0.67BiFeO₃–0.33BaTiO₃ ceramics doped with x mol% MnO₂: (a) x = 2, (b) x = 3, (c) x = 4, (d) x = 5, (e) x = 6, (f) x = 8, and (g) x = 10.

Composition dependence of (a) the lattice parameters a and c of the Mn-doped 0.67BiFeO₃–0.33BaTiO₃ ceramics, and (b) the volume of unit cell.

Raman spectra of the 0.67BiFeO₃–0.33BaTiO₃ multiferroic ceramics doped with x mol% MnO₂: (a) x = 2, (b) x = 3, (c) x = 4, (d) x = 5, (e) x = 6, (f) x = 8, and (g) x = 10.

Bright-field TEM images of the typical grains in the 0.67BiFeO₃–0.33BaTiO₃ ceramics doped with x mol% MnO₂: (a) x = 3, (b) x = 4, (c) x = 6, and (d) x = 10.

HRTEM images taken from single grain in the 0.67BiFeO₃–0.33BaTiO₃ ceramics doped with x mol% MnO₂: (a) x = 3, (b) x = 4, (c) x = 6, and (d) x = 10. The insets are the SAED patterns taken from a single grain or the fast Fourier patterns of the corresponding HRTEM images of different grains. The two-dimensional lattice fringes are indicated.

(a) Bright- and (b) dark-field TEM images of the ferroelectric domain structures observed in the 0.67BiFeO₃–0.33BaTiO₃ solid solution doped with 3 mol% MnO₂.

(a) TEM image of nano-sized ferroelectric domains lamellae (with average width of 5 nm) observed in the 0.67BiFeO₃–0.33BaTiO₃ solid solution doped with 10 mol% MnO₂, and (b) enlarged TEM image of the nano-sized ferroelectric domain lamellae. (c) and (d) HRTEM images of the nano-sized ferroelectric domain lamellae obtained from the local areas marked by boxes A and B in (b), respectively.

(a) Room-temperature dielectric constants and (b) dielectric losses of the 0.67BiFeO₃–0.33BaTiO₃ ceramics doped with different levels of MnO₂ as a function of the measured frequency. Inset in (a) is the dielectric constants of the Mn-doped 0.67BiFeO₃–0.33BaTiO₃ ceramics as a function of the Mn-doped level.

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