DocumentCode :
3525039
Title :
A transmission electron microscopy study of submicrometer BiFeO3 particle prepared by an improved solid state reaction
Author :
Si, Mei-ju ; Hou, Yu-Dong ; Ge, Hai-Yan ; Zhu, Man-Kang ; Yan, Hui
Author_Institution :
Dept. of Mater. Sci. & Eng., Beijing Univ. of Technol., Beijing, China
fYear :
2011
fDate :
9-11 Dec. 2011
Firstpage :
437
Lastpage :
440
Abstract :
In this work, submicrometer bismuth ferrite (BiFeO3) particles have been prepared at the temperature of 750 °C by the improved solid state reaction, in which the quick sintering step is crucial in obtaining pure perovskite phase. The X-ray diffractometer (XRD) analysis indicates that the obtained BiFeO3 particles are rhombohedral structure, and the refined cell parameters are a=5.622Å and α=59.355° (R=8.35%), similar to the reported data (JCPDS Card 86-1518, a=5.632Å and α=59.356°). The microstructure has been observed using transmission electron microscope (TEM), and the image shows that BiFeO3 powders have the quasi spherical morphology with the mean particle size between 100-150nm. Further, the distinct lattice fringes reveal the nature of the single-crystalline BiFeO3 nanostructure, and the interplanar spacing is about 0.87nm, corresponding well to the double spacing of (012). Moreover, it is interesting to note that there existed the dislocation in BiFeO3 particle, which is believed to arise from the collision of different grains in growing process. The sintered compact bodies from BiFeO3 fine particles show the slim ferroelectric loops, and dielectric properties are frequency independent. The measured dielectric constant and loss tangent are 19.5 and 0.0025 at room temperature, showing the potential application in multiferroic devices.
Keywords :
X-ray diffraction; bismuth compounds; dielectric losses; dislocations; ferroelectric ceramics; multiferroics; nanofabrication; nanostructured materials; permittivity; sintering; transmission electron microscopy; BiFeO3; TEM; X-ray diffractometer analysis; XRD; cell parameters; dielectric constant; dislocation; grain processing; interplanar spacing; lattice fringes; loss tangent; mean particle size; microstructure; multiferroic devices; nanostructure; powders; pure perovskite phase; quasispherical morphology; quick sintering step; rhombohedral structure; sintered compact bodies; size 100 nm to 150 nm; slim ferroelectric loops; solid state reaction; submicrometer bismuth ferrite particles; temperature 293 K to 298 K; temperature 750 degC; transmission electron microscopy; Ceramics; Dielectrics; Powders; Solids; Temperature measurement; X-ray scattering; Bismuth ferrite; Dielectric properties; TEM;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Piezoelectricity, Acoustic Waves and Device Applications (SPAWDA), 2011 Symposium on
Conference_Location :
Shenzhen
Print_ISBN :
978-1-4673-1075-8
Type :
conf
DOI :
10.1109/SPAWDA.2011.6167282
Filename :
6167282
Link To Document :
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