The Global and Local Symmetries of Nanostructured Ferroelectric Relaxor 0.94(Bi0.5Na0.5)TiO3-0.06BaTiO3

被引：10
作者：
Montero-Cabrera, Maria E. [1 ]
Pardo, Lorena [2 ]
Garcia, Alvaro [2 ]
Fuentes-Montero, Maria E. [3 ]
Lourdes Ballinas-Casarrubias, M. [3 ]
Fuentes-Cobas, Luis E. [1 ]
机构：
[1] Ctr Invest Mat Avanzados, Chihuahua, Mexico
[2] CSIC, Inst Ciencia Mat Madrid, Madrid, Spain
[3] Univ Autonoma Chihuahua, Fac Ciencias Quim, Chihuahua, Mexico
来源：
FERROELECTRICS | 2014年 / 469卷 / 01期
关键词：
FREE PIEZOELECTRIC CERAMICS; NEAR-EDGE STRUCTURE; FREE (1-X)(BI1/2NA1/2)TIO3-XBATIO(3) CERAMICS; TRANSMISSION ELECTRON-MICROSCOPY; MORPHOTROPIC PHASE-BOUNDARY; LEAD-FREE PIEZOCERAMICS; RAY-ABSORPTION-SPECTRA; DIELECTRIC-PROPERTIES; TRANSITION; NA0.5BI0.5TIO3;
D O I：
10.1080/00150193.2014.948358
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Novel submicrometer-grained 0.94(Bi0.5Na0.5)TiO3-0.06 BaTiO3 ceramic, prepared from nanopowder by a combination of hot-pressing and recrystallization, is investigated by high-resolution synchrotron x-ray diffraction and x-ray absorption near-edge spectroscopy (XANES). The simplest and best-fitting Rietveld refinement of the performed wide-Q diffraction experiment corresponds to a three-phase system formed by a ferroelectric rhombohedral R3c phase, a globally cubic Pm<(3)over bar>m phase and a small amount of nanosized (similar to 12 nm) quasi-cubic phase. The globally cubic phase and the nanosized one built up a complex, nanostructured, configuration that accounts for the reported dielectric relaxor behavior. XANES reveals that the departures from centro-symmetry at the unit cell scale for the precursor powder and for the sintered ceramic are practically the same.
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收藏
页码：50 / 60
页数：11
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