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Sol-Gel Synthesis of the Strontium-Copper Oxycarbonate Superconductor Sr2CuO2(CO3)1−x(BO3)x

Published online by Cambridge University Press:  15 February 2011

Audrey J. Babcock ,
Alexander R. Pico  and
Catherine J. Page
Audrey J. Babcock
Affiliation:
Department of Chemistry, University of Oregon, Eugene, Oregon 97403
Alexander R. Pico
Affiliation:
Department of Chemistry, University of Oregon, Eugene, Oregon 97403
Catherine J. Page
Affiliation:
Department of Chemistry, University of Oregon, Eugene, Oregon 97403
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Abstract

We have developed an ambient-pressure sol-gel synthetic route to superconducting borate-doped Sr2CuO2(CO3) using polyether alkoxide precursors. In our sol-gel preparation, the starting solutions contain strontium and copper alkoxide complexes in 2-(2-methoxy-ethoxy)ethanol. Boron is incorporated into the solution by using an aqueous boric acid solution for hydrolysis. Dried gels were examined by x-ray diffraction and thermal gravimetric analysis. By experimenting with various firing sequences and atmospheres we have established a successful route for reproducibly preparing relatively pure Sr2CuO2CO3 and boron-doped phases. Final products were characterized by x-ray diffraction, elemental analysis and magnetic susceptibility. Samples of nominal composition Sr2CuO2(CO3)0.85(BO2)0.15 are superconducting with a Tc(onset) of ∼25K. Subsequent treatment at 1100°C and 3 GPa for one hour increased Tc(onset) to ∼35K.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 59
Copyright
Copyright © Materials Research Society 1997

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References

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