Structural, spectroscopic, and dielectric characterizations of Mn-doped 0.67BiFeO3-0.33BaTiO3 multiferroic ceramics
Year: 2013
Type: article
Abstract: 0.67BiFeO 3 -0.33BaTiO 3 multiferroic ceramics doped with x mol% MnO 2 ( 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 10 3 Hz, and the corresponding dielectric losses were in range of 0.43–0.96, approaching to 0.09 at 10 6 Hz.
Source: Journal of Advanced Ceramics
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,372
Awards: G1344954487, G1915661486, G2055272995, G2210207779, G2469366261, 铁电极化调控铁电薄膜电子稳态输运过程的研究, G291986185, G2988667402, G4538059157, G4662508086, G4675237367, G4729013398, G5534291116, G5853246740, G5974965231, BiFeO3多铁性纳米岛低维量子结构的可控制备、多铁性能调控及铁性畴结构研究, G6561921193, G6602645632, G7095577012, G773855445
OpenAlex ID: W2004174134