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Electrochemical Synthesis and Characterization of La2CuO4+δ Single Crystals

Published online by Cambridge University Press:  31 January 2011

D. P. Scarfe ,
X. Xiong ,
W. J. Zhu ,
P. H. Hor ,
S. C. Moss  and
A. J. Jacobson
D. P. Scarfe
Affiliation:
Department of Physics and Texas Center for Superconductivity (TCSUH), University of Houston, and Department of Chemistry and Texas Center for Superconductivity (TCSUH), University of Houston, Houston, Texas 77004
X. Xiong
Affiliation:
Department of Physics and Texas Center for Superconductivity (TCSUH), University of Houston, Houston, Texas 77004
W. J. Zhu
Affiliation:
Department of Physics and Texas Center for Superconductivity (TCSUH), University of Houston, Houston, Texas 77004
P. H. Hor
Affiliation:
Department of Physics and Texas Center for Superconductivity (TCSUH), University of Houston, Houston, Texas 77004
S. C. Moss
Affiliation:
Department of Physics and Texas Center for Superconductivity (TCSUH), University of Houston, Houston, Texas 77004
A. J. Jacobson
Affiliation:
Department of Chemistry and Texas Center for Superconductivity (TCSUH), University of Houston, Houston, Texas 77004
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Abstract

An electrochemical oxidation technique was used to obtain bulk oxidized La2CuO4+δ single crystals from the as-grown crystals. Samples were prepared by galvanostatic oxidation with currents in the range 5–10 μA and with different charging times. Some samples were annealed at 110 °C in flowing oxygen. Small high-quality crystals were obtained from electrochemically oxidized larger crystals that contained microcracks. Transmission x-ray Laue photography and rocking curve measurements for several fundamental diffraction peaks were used to confirm the crystal quality. The Tc and bulk magnetic properties of samples at different stages in the oxidation process are reported. After annealing at 110 °C, a 15 K transition was observed.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 4 , April 1999 , pp. 1221 - 1226
Copyright
Copyright © Materials Research Society 1999

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