期刊
JOURNAL OF ADVANCED CERAMICS
卷 2, 期 3, 页码 252-259出版社
SPRINGEROPEN
DOI: 10.1007/s40145-013-0068-7
关键词
multiferroic ceramics; dielectric properties; Raman spectra; microstructure
资金
- National Natural Science Foundation of China [10874065, 11174122, 11134004]
- National Basic Research Program of China [2009CB929503, 2012CB619400]
- key project from Ministry of Science and Technology of the People's Republic of China [2009ZX02101-4]
- Analysis & Test Fund of Nanjing University
- KAUST baseline funds
0.67BiFeO(3)-0.33BaTiO(3) 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 mu m to 0.50 mu m 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 degrees 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 10(3) Hz, and the corresponding dielectric losses were in range of 0.43-0.96, approaching to 0.09 at 10(6) Hz.
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