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.

引用

页码：50 / 60

页数：11

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