Atomic-Scale Studies of Complex Oxide Interfaces Using Aberration-Corrected Z-contrast Imaging and EELS

2006 ◽  
Vol 12 (S02) ◽  
pp. 112-113
Author(s):  
RF Klie ◽  
MA Schofield ◽  
M Varela ◽  
SJ Pennycook ◽  
A Bleloch ◽  
...  
Keyword(s):  
Complex Oxide ◽  
Atomic Scale ◽  
Contrast Imaging ◽  
Oxide Interfaces ◽  
Z Contrast ◽  
Aberration Corrected

Extended abstract of a paper presented at Microscopy and Microanalysis 2006 in Chicago, Illinois, USA, July 30 – August 3, 2006

Atomic Scale Analysis of a YSZ Bicrystal Grain Boundary

2001 ◽  
Vol 7 (S2) ◽  
pp. 400-401
Author(s):  
Y. Lei ◽  
Y. Ito ◽  
N. D. Browning
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Bulk Material ◽  
Atomic Scale ◽  
Structure Property ◽  
Contrast Imaging ◽  
Structure Property Relationships ◽  
Commercial Applications ◽  
Z Contrast ◽  
Electron Energy Loss

Yttria-stabilized zirconia (YSZ) has been the subject of many experimental and theoretical studies, due to the commercial applications of zirconia-based ceramics in solid state oxide fuel cells. Since the grain boundaries usually dominate the overall macroscopic performance of the bulk material, it is essential to develop a fundamental understanding of their structure-property relationships. Previous research has been performed on the atomic structure of grain boundaries in YSZ, but no precise atomic scale compositional and chemistry characterization has been carried out. Here we report a detailed analytical study of an [001] symmetric 24° bicrystal tilt grain boundary in YSZ prepared with ∼10 mol % Y2O3 by Shinkosha Co., Ltd by the combination of Z-contrast imaging and electron energy loss spectroscopy (EELS).The experimental analysis of the YSZ sample was carried out on a 200kV Schottky field emission JEOL 201 OF STEM/TEM4.

Analysis of the Atomic Scale Defect Chemistry in Oxygen Deficient Materials by STEM

1999 ◽  
Vol 589 ◽  
Author(s):  
Y. Ito ◽  
S. Stemmer ◽  
R. F. Klie ◽  
N. D. Browning ◽  
A. Sane ◽  
...  
Keyword(s):  
Preliminary Investigation ◽  
High Mobility ◽  
Scanning Transmission Electron Microscope ◽  
Defect Chemistry ◽  
Atomic Scale ◽  
Contrast Imaging ◽  
Separation Membranes ◽  
Oxidation Reduction ◽  
Scanning Transmission ◽  
Z Contrast

AbstractThe high mobility of anion vacancies in oxygen deficient perovskite type materials makes these ceramics potential candidates for oxygen separation membranes. As a preliminary investigation of the defect chemistry in these oxides, we show here the analysis of SrCoO3−σ using atomic resolution Z-contrast imaging and electron energy loss spectroscopy in the scanning transmission electron microscope. In particular, after being subjected to oxidation/reduction cycles at high temperatures we find the formation of ordered microdomains with the brownmillerite structure.

Observation of Pt Atoms, Clusters and Rafts on Oxide Supports, by Sub-Ångström Z-Contrast Imaging in an Aberration-Corrected STEM/TEM

2006 ◽  
Vol 12 (S02) ◽  
pp. 50-51 ◽  
Author(s):  
DA Blom ◽  
SA Bradley ◽  
W Sinkler ◽  
LF Allard
Keyword(s):  
Contrast Imaging ◽  
Oxide Supports ◽  
Aberration Corrected Stem ◽  
Z Contrast ◽  
Aberration Corrected

Extended abstract of a paper presented at Microscopy and Microanalysis 2006 in Chicago, Illinois, USA, July 30 – August 3, 2005

Bonding, Defects, And Defect Dynamics In The Sic-SiO2 System

2000 ◽  
Vol 640 ◽  
Author(s):  
S. T. Pantelides ◽  
R. Buczko ◽  
M. Di Ventra ◽  
S. Wang ◽  
S.-G. Kim ◽  
...  
Keyword(s):  
First Principles ◽  
Oxidation Process ◽  
Atomic Scale ◽  
Contrast Imaging ◽  
Interface Defects ◽  
Device Applications ◽  
Z Contrast ◽  
And Control ◽  
Electron Energy Loss ◽  
Ultimate Purpose

ABSTRACTThis paper presents a review of new results obtained by a combination of first-principles theory, Z-contrast imaging, and electron-energy-loss spectroscopy in the context of a broader experimental/theoretical program to understand and control the atomic-scale structure of SiCSiO2 interfaces. The ultimate purpose is to achieve low interface trap densities for device applications. Results are given for global bonding arrangements in comparison with those of the Si-SiO2 interface, the mechanism of the oxidation process, the nature of possible interface defects and their passivation by N and H, and the formation and dissolution of C clusters in SiO2 during oxidation and reoxidation.

Atomic-Scale Investigation of Two-Component MoVO Complex Oxide Catalysts Using Aberration-Corrected High-Angle Annular Dark-Field Imaging

2010 ◽  
Vol 22 (6) ◽  
pp. 2033-2040 ◽  
Author(s):  
William D. Pyrz ◽  
Douglas A. Blom ◽  
Masahiro Sadakane ◽  
Katsunori Kodato ◽  
Wataru Ueda ◽  
...  
Keyword(s):  
Complex Oxide ◽  
Dark Field ◽  
Oxide Catalysts ◽  
Atomic Scale ◽  
High Angle ◽  
Dark Field Imaging ◽  
Two Component ◽  
Annular Dark Field ◽  
Field Imaging ◽  
Aberration Corrected

scholarly journals The Atomic-Scale Origins of Grain Boundary Superconducting Properties

1998 ◽  
Vol 4 (S2) ◽  
pp. 688-689
Author(s):  
S. J. Pennycook ◽  
J. Buban ◽  
C. Prouteau ◽  
M. F. Chisholm ◽  
P. D. Nellist ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Atomic Scale ◽  
Contrast Imaging ◽  
Qualitative Understanding ◽  
Quantitative Understanding ◽  
Bond Valence Sum ◽  
Z Contrast ◽  
Coherence Lengths ◽  
Contrast Image

Due to the extemely short coherence lengths of the high-Tc superconductors (around 30 Å in the a-b plane), defects such as grain boundaries are obvious barriers to the flow of supercurrent. Within a few months of the discovery of these materials, it was shown how the critical current dropped four orders of magnitude as the grain boundary misorientaion increased from zero to 45°. Even today, there is no quantitative understanding of this behavior. A qualitative understanding is however possible through atomic resolution Z-contrast imaging on YBa2cu3O7-δ and SrTiO3 bicrystal grain boundaries, combined with bond-valence-sum analysis.The Z-contrast image of a YBa2cu3O7-δ low angle grain boundary in Fig. 1 shows the same kind of reconstructed dislocation cores as seen in SrTiO3, containing reconstructions on both the Cu and Y/Ba sublattices.

Atomic Scale Characterization of Oxygen-Deficient Ceramic Membranes by EELS and Z-Contrast Imaging

2000 ◽  
Vol 6 (S2) ◽  
pp. 118-119
Author(s):  
Robert F. Klie ◽  
Yasuo Ito ◽  
Nigel D. Browning ◽  
Susanne Stemmer ◽  
Terry J. Mazanec
Keyword(s):  
Oxygen Vacancies ◽  
Elevated Temperatures ◽  
Equilibrium Concentration ◽  
Ceramic Membranes ◽  
Atomic Scale ◽  
Contrast Imaging ◽  
Specific Order ◽  
Scale Characterization ◽  
Temperature Equilibrium ◽  
Z Contrast

The Perovskite structured ceramic (Lax,Sr1-x)(Fey,Cr1-y)O3-δ being developed for applications in oxygen transporting membranes. The permeability of this material is limited by the number of free ions, point-defects (oxygen vacancies) and electrons in the bulk. As any ordering of these unbound particles will restrict their mobility one key issue for controlling the membrane efficiency is the formation of ordered oxygen vacancies. In particular it is very likely, that at elevated temperatures ordered micro-domains progressively grow and asymptotically reach a stable equilibrium concentration. This is consistent with the observations of Kruidhof that below a specific order-disorder transition temperature equilibrium times of 30-40 h are required to attain steady-state conditions, irrespective of the thermal history of the sample.We investigate the formation of ordered vacancies in (Lax,Sr1-x)(Fey,Cr1-y)O3-δ by atomic resolution Z-contrast imaging and electron energy-loss spectroscopy (EELS) using a 200 keV STEM/TEM JEOL2010L with a post column Gatan Image Filter (GIF).

Aberration-corrected Z-contrast imaging of SrTiO3 dislocation cores

2008 ◽  
Vol 58 (3) ◽  
pp. 185-191 ◽  
Author(s):  
R. F. Klie ◽  
W. Walkosz ◽  
G. Yang ◽  
Y. Zhao
Keyword(s):  
Contrast Imaging ◽  
Z Contrast ◽  
Aberration Corrected
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