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Title: Nano-scale stoichiometry analysis of a high temperature superconductor by atom probe tomography

The functional properties of the high-temperature superconductor Y 1Ba 2Cu 3O 7-δ (Y-123) are closely correlated to the exact stoichiometry and oxygen content. Exceeding the critical value of 1 oxygen vacancy for every five unit cells (δ>0.2, which translates to a 1.5 at% deviation from the nominal oxygen stoichiometry of Y 7.7Ba 15.3Cu 23O 54-δ ) is sufficient to alter the superconducting properties. Stoichiometry at the nanometer scale, particularly of oxygen and other lighter elements, is extremely difficult to quantify in complex functional ceramics by most currently available analytical techniques. The present study is an analysis and optimization of the experimental conditions required to quantify the local nanoscale stoichiometry of single crystal yttrium barium copper oxide (YBCO) samples in three dimensions by atom probe tomography (APT). APT analysis required systematic exploration of a wide range of data acquisition and processing conditions to calibrate the measurements. Laser pulse energy, ion identification, and the choice of range widths were all found to influence composition measurements. The final composition obtained from melt-grown crystals with optimized superconducting properties was Y 7.9Ba 10.4Cu 24.4O 57.2.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [3] ;  [1] ;  [4]
  1. Univ. of Oxford (United Kingdom)
  2. Max-Planck-Inst. fur Eisenforschung, Dusseldorf (Germany); Univ. of Oxford (United Kingdom)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Curtin Univ, Perth, WA (Australia)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Microscopy and Microanalysis
Additional Journal Information:
Journal Volume: 23; Journal Issue: 02; Journal ID: ISSN 1431-9276
Publisher:
Microscopy Society of America (MSA)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1360027

Pedrazzini, Stella, London, Andrew J., Gault, Baptiste, Speller, Suzy, Grovenor, Chris, Danaie, Mohsen, Moody, Michael P., Edmondson, Philip D., Bagot, Paul, and Saxey, David. Nano-scale stoichiometry analysis of a high temperature superconductor by atom probe tomography. United States: N. p., Web. doi:10.1017/S1431927616012757.
Pedrazzini, Stella, London, Andrew J., Gault, Baptiste, Speller, Suzy, Grovenor, Chris, Danaie, Mohsen, Moody, Michael P., Edmondson, Philip D., Bagot, Paul, & Saxey, David. Nano-scale stoichiometry analysis of a high temperature superconductor by atom probe tomography. United States. doi:10.1017/S1431927616012757.
Pedrazzini, Stella, London, Andrew J., Gault, Baptiste, Speller, Suzy, Grovenor, Chris, Danaie, Mohsen, Moody, Michael P., Edmondson, Philip D., Bagot, Paul, and Saxey, David. 2017. "Nano-scale stoichiometry analysis of a high temperature superconductor by atom probe tomography". United States. doi:10.1017/S1431927616012757. https://www.osti.gov/servlets/purl/1360027.
@article{osti_1360027,
title = {Nano-scale stoichiometry analysis of a high temperature superconductor by atom probe tomography},
author = {Pedrazzini, Stella and London, Andrew J. and Gault, Baptiste and Speller, Suzy and Grovenor, Chris and Danaie, Mohsen and Moody, Michael P. and Edmondson, Philip D. and Bagot, Paul and Saxey, David},
abstractNote = {The functional properties of the high-temperature superconductor Y1Ba2Cu3O7-δ (Y-123) are closely correlated to the exact stoichiometry and oxygen content. Exceeding the critical value of 1 oxygen vacancy for every five unit cells (δ>0.2, which translates to a 1.5 at% deviation from the nominal oxygen stoichiometry of Y7.7Ba15.3Cu23O54-δ ) is sufficient to alter the superconducting properties. Stoichiometry at the nanometer scale, particularly of oxygen and other lighter elements, is extremely difficult to quantify in complex functional ceramics by most currently available analytical techniques. The present study is an analysis and optimization of the experimental conditions required to quantify the local nanoscale stoichiometry of single crystal yttrium barium copper oxide (YBCO) samples in three dimensions by atom probe tomography (APT). APT analysis required systematic exploration of a wide range of data acquisition and processing conditions to calibrate the measurements. Laser pulse energy, ion identification, and the choice of range widths were all found to influence composition measurements. The final composition obtained from melt-grown crystals with optimized superconducting properties was Y7.9Ba10.4Cu24.4O57.2.},
doi = {10.1017/S1431927616012757},
journal = {Microscopy and Microanalysis},
number = 02,
volume = 23,
place = {United States},
year = {2017},
month = {1}
}