Imperial College London
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DrStellaPedrazzini

Faculty of Engineering, Department of Materials

Senior Lecturer
 
 
 
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Contact

 

s.pedrazzini Website

 
 
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Location

 

1.18Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Pedrazzini:2017:10.1017/S1431927616012757,
author = {Pedrazzini, S and London, AJ and Gault, B and Saxey, D and Speller, S and Grovenor, CRM and Danaie, M and Moody, MP and Edmondson, PD and Bagot, PAJ},
doi = {10.1017/S1431927616012757},
journal = {Microscopy and Microanalysis},
pages = {414--424},
title = {Nanoscale stoichiometric analysis of a high-temperature superconductor by atom probe tomography},
url = {http://dx.doi.org/10.1017/S1431927616012757},
volume = {23},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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.
AU  - Pedrazzini,S
AU  - London,AJ
AU  - Gault,B
AU  - Saxey,D
AU  - Speller,S
AU  - Grovenor,CRM
AU  - Danaie,M
AU  - Moody,MP
AU  - Edmondson,PD
AU  - Bagot,PAJ
DO  - 10.1017/S1431927616012757
EP  - 424
PY  - 2017///
SN  - 1431-9276
SP  - 414
TI  - Nanoscale stoichiometric analysis of a high-temperature superconductor by atom probe tomography
T2  - Microscopy and Microanalysis
UR  - http://dx.doi.org/10.1017/S1431927616012757
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000405595600026&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/64138
VL  - 23
ER  -
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