Atomic-scale visualization of antisite defects in LiFePO4

被引：156

作者：

Chung, Sung-Yoon ^{[1
,2
]}

Choi, Si-Young ^{[3
,4
]}

Yamamoto, Takahisa ^{[5
,6
]}

Ikuhara, Yuichi ^{[3
,6
]}

机构：

[1] Inha Univ, Dept Mat Sci & Engn, Inchon 402751, South Korea

[2] Nalphates LLC, Wilmington, DE 19801 USA

[3] Univ Tokyo, Inst Engn Innovat, Tokyo 1138656, Japan

[4] Korea Inst Mat Sci, Chang Won 641831, South Korea

[5] Univ Tokyo, Dept Adv Mat Sci, Tokyo 1138656, Japan

[6] Japan Fine Ceram Ctr, Nanostruct Res Lab, Nagoya, Aichi 4568587, Japan

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.100.125502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We visualize the antisite exchange defects in LiFePO4 crystals with an ordered olivine structure by using annular dark-field scanning transmission electron microscopy (STEM). A recognizable bright contrast is observed in some of the Li columns of STEM images in a sample annealed at a lower temperature, which directly demonstrates the disordered occupations by Fe atoms. Furthermore, such exchange defects appear to be locally aggregated rather than homogeneously dispersed in the lattice, although their overall concentration is fairly low. The present study emphasizes the significance of atomic-level observations for the defect distribution that cannot be predicted by macroscopic analytical methods.

引用

页数：4

共 19 条

[1] Sub-angstrom resolution using aberration corrected electron optics [J].

Batson, PE ;

Dellby, N ;

Krivanek, OL .

NATURE, 2002, 418 (6898) :617-620

[2] Grain boundary strengthening in alumina by rare earth impurities [J].

Buban, JP ;

Matsunaga, K ;

Chen, J ;

Shibata, N ;

Ching, WY ;

Yamamoto, T ;

Ikuhara, Y .

SCIENCE, 2006, 311 (5758) :212-215

[3] Electronically conductive phospho-olivines as lithium storage electrodes [J].

Chung, SY ;

Bloking, JT ;

Chiang, YM .

NATURE MATERIALS, 2002, 1 (02) :123-128

[4]

*EPAPS, EPRLTAO100074813 EPA

[5] The Earth's mantle [J].

Helffrich, GR ;

Wood, BJ .

NATURE, 2001, 412 (6846) :501-507

[6] High-temperature study of octahedral cation exchange in olivine by neutron powder diffraction [J].

Henderson, CMB ;

Knight, KS ;

Redfern, SAT ;

Wood, BJ .

SCIENCE, 1996, 271 (5256) :1713-1715

[7] QUANTITATIVE OLIVINE-DEFECT CHEMICAL-MODEL - INSIGHTS ON ELECTRICAL-CONDUCTION, DIFFUSION, AND THE ROLE OF FE CONTENT [J].

HIRSCH, LM ;

SHANKLAND, TJ .

GEOPHYSICAL JOURNAL INTERNATIONAL, 1993, 114 (01) :21-35

[8]

*HREM RES INC, DEC STEM IM WAS DON

[9] INCOHERENT IMAGING OF THIN SPECIMENS USING COHERENTLY SCATTERED ELECTRONS [J].

JESSON, DE ;

PENNYCOOK, SJ .

PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1993, 441 (1912) :261-281

[10] Direct observation of defect-mediated cluster nucleation [J].

Kaiser, U ;

Muller, DA ;

Grazul, JL ;

Chuvilin, A ;

Kawasaki, M .

NATURE MATERIALS, 2002, 1 (02) :102-105

← 1 2 →