Nanoscale Bi2FeO6-x precipitates in BiFeO3 thin films: a metastable Aurivillius phase

被引：11

作者：

Deniz, Hakan ^{[1
]}

Bhatnagar, Akash ^{[1
]}

Pippel, Eckhard ^{[1
]}

Hillebrand, Reinald ^{[1
]}

Haehnel, Angelika ^{[1
]}

Alexe, Marin ^{[1
,2
]}

Hesse, Dietrich ^{[1
]}

机构：

[1] Max Planck Inst Microstruct Phys, D-06120 Halle, Saale, Germany

[2] Univ Warwick, Coventry CV4 7AL, W Midlands, England

来源：

JOURNAL OF MATERIALS SCIENCE | 2014年 / 49卷 / 20期

基金：

欧盟第七框架计划;

关键词：

X-RAY-ABSORPTION; CRYSTAL; CHEMISTRY;

D O I：

10.1007/s10853-014-8400-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the observation of nano-scale precipitates corresponding to a new structure not displayed by the phase diagram of bismuth iron oxide. BiFeO3 (BFO) thin films grown on terbium scandate and strontium titanate substrates by pulsed laser deposition were investigated using high-resolution transmission and scanning transmission electron microscopy. Precipitate-like structures with a so far unknown metastable phase of bismuth, iron, and oxygen were observed in these films. They consist of well-ordered Bi2O2 layers, as they are known from bismuth oxide layered compounds. They have a pseudo-orthorhombic structure with a single perovskite-like unit (FeO6) sandwiched between Bi2O2 layers, similar to the Aurivillius phase Bi2WO6, with a chemical composition of the precipitates of Bi2FeO6-x . The structure of the new phase with its lattice constants was elucidated and the band gap of the precipitates was determined by electron energy loss spectroscopy. The results point to promising future applications for this new phase in the field of electronics, if it might be grown phase pure as an epitaxial thin film.

引用

页码：6952 / 6960

页数：9

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