Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-26T21:07:42.782Z Has data issue: false hasContentIssue false
  • English
  • Français

Non-Stoichiometry at Dislocation Cores in Perovskites and Related Materials

Published online by Cambridge University Press:  02 July 2020

Gerd Duscher ,
M. Kim ,
N.D. Browning ,
D. K. Christen ,
C. Cantoni ,
S. T. Pantelides  and
S. J. Pennycook
Gerd Duscher
Affiliation:
North Carolina State University, Materials Science and Engineering Department, Raleigh, NC Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN
M. Kim
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN Dept. of Physics, University of Illinois at Chicago, Chicago, IL
N.D. Browning
Affiliation:
Dept. of Physics, University of Illinois at Chicago, Chicago, IL
D. K. Christen
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN
C. Cantoni
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN
S. T. Pantelides
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN Vanderbilt University, Department of Physics & Astronomy, Nashville, TN
S. J. Pennycook
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN Vanderbilt University, Department of Physics & Astronomy, Nashville, TN
Get access

Abstract

Z-contrast images and electron energy loss spectra (EELS) were obtained from low angle grain boundaries in SrTiO3 and YBa2Cu3O7-x (YBCO). Z-contrast images are easy to interpret and especially useful for positioning the beam to acquire EELS data from small sample areas [1], because both these techniques can be performed simultaneously.

In high-temperature superconductors even a single grain boundary can reduce the critical current by up to four orders of magnitude. The band-bending model can quantitatively explain this phenomenon. YBCO is a hole-doped superconductor with about one hole per unit cell for optimum doping at x close to zero. It has a structure closely related to the perovskite structure, and Z-contrast images have shown that the dislocation cores are made up of similar structural units as in SrTiO3.[2,3] Our EELS measurements show clear evidence for band bending effects around isolated dislocation cores in an undoped 8° low angle grain boundary.

Type
Quantitative Transmission Electron Microscopy of Interfaces (Organized by M. Rüehle, Y. Zhu and U. Dahmen)
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 306 - 307
Copyright
Copyright © Microscopy Society of America 2001

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

[1]Duscher, G., Browning, N. D. and Pennycook, S. J., Phys. Stat. Sol. a 166 (1998) 327.3.0.CO;2-R>CrossRefGoogle Scholar
[2]Kim, M. et al Phys. Rev. Lett, in pressGoogle Scholar
[3]Browning, N D et al Physica C 294 (1998) 183CrossRefGoogle Scholar
[4]Hammerl, G. et al Nature 407 (2000) 162CrossRefGoogle Scholar
[5]This work was supported by the USDOE under contract DE-AC05-00OR22725 managed by UTBattelle, LLC.Google Scholar