DOI: 10.1557/jmr.1989.1289. Synthesis of B2YCu4O8 by anionic oxidation-reduction

Synthesis of B2YCu4O8 by anionic oxidation-reduction

10.1557/jmr.1989.1289

Crossref journal-article

Springer Science and Business Media LLC

Journal of Materials Research (297)

Abstract

The superconducting phase Ba2YCu4O8 has been synthesized (as a bulk powder) in flowing oxygen. This was achieved by using the anionic oxidation/reduction method (or the SCD method), in which an aqueous solution containing oxidizing (NO−3 salts) and reducing components (e.g., acetate salts) is spray dried into an intimate mixture. At 300 °C, an internal exothermic oxidation/reduction reaction completely converts the spray-dried powder into the corresponding mixed oxides in one reaction step. Because the resultant mixed oxide powder is homogeneous on a fine scale, the final oxide phase can subsequently be produced at lower temperatures and shorter reaction times. Using this method, ∼93–94% phase pure Ba2YCu4O8 (as determined by x-ray diffraction) has been synthesized in flowing oxygen. Pellets of Ba2YCu4O4 fabricated from the mixed oxides were prepared and partially sintered by firing at 800 °C in flowing oxygen for 50 h. Resistivity and magnetic (AC) susceptibility measurements show onset Tc's of 82–84 and 72–73 K, respectively.

Bibliography

Kourtakis, K., Robbins, M., Gallagher, P. K., & Tiefel, T. (1989). Synthesis of B2YCu4O8 by anionic oxidation-reduction. Journal of Materials Research, 4(6), 1289â1291.

Authors 4

K. Kourtakis (first)
M. Robbins (additional)
P. K. Gallagher (additional)
T. Tiefel (additional)

References 5 Referenced 37

10.1038/336660a0
10.1103/PhysRevB.37.9353
{'key': 'S0884291400004945_ref002', 'volume': 'A105', 'author': 'Zandbergen', 'year': '1988', 'journal-title': 'Phys. Status Solidi'} / Phys. Status Solidi by Zandbergen (1988)
4 Cava R.J. Krajewski J.J. Peck W. F. Batlogg B. Rupp L. W. Jr , Fleming R. M. A.C. James W. P. and Marsh P. preprint.
5 Kourtakis K. Robbins M. and Gallagher P. K. submitted to Solid State Chem. (1989).

Dates

Type	When
Created	17 years, 11 months ago (Sept. 27, 2007, 5:36 a.m.)
Deposited	4 years, 6 months ago (Feb. 24, 2021, 4:27 p.m.)
Indexed	2 months, 1 week ago (June 16, 2025, 8:08 a.m.)
Issued	35 years, 8 months ago (Dec. 1, 1989)
Published	35 years, 8 months ago (Dec. 1, 1989)
Published Online	14 years, 6 months ago (Jan. 31, 2011)
Published Print	35 years, 8 months ago (Dec. 1, 1989)

Funders 0

None

BibTeX

@article{Kourtakis_1989, title={Synthesis of B2YCu4O8 by anionic oxidation-reduction}, volume={4}, ISSN={2044-5326}, url={http://dx.doi.org/10.1557/jmr.1989.1289}, DOI={10.1557/jmr.1989.1289}, number={6}, journal={Journal of Materials Research}, publisher={Springer Science and Business Media LLC}, author={Kourtakis, K. and Robbins, M. and Gallagher, P. K. and Tiefel, T.}, year={1989}, month=dec, pages={1289–1291} }

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  "abstract": "<jats:p>The superconducting phase Ba<jats:sub>2</jats:sub>YCu<jats:sub>4</jats:sub>O<jats:sub>8</jats:sub> has been synthesized (as a bulk powder) in flowing oxygen. This was achieved by using the anionic oxidation/reduction method (or the SCD method), in which an aqueous solution containing oxidizing (NO<jats:sup>\u2212</jats:sup><jats:sub>3</jats:sub> salts) and reducing components (e.g., acetate salts) is spray dried into an intimate mixture. At 300 \u00b0C, an internal exothermic oxidation/reduction reaction completely converts the spray-dried powder into the corresponding mixed oxides in one reaction step. Because the resultant mixed oxide powder is homogeneous on a fine scale, the final oxide phase can subsequently be produced at lower temperatures and shorter reaction times. Using this method, \u223c93\u201394% phase pure Ba<jats:sub>2</jats:sub>YCu<jats:sub>4</jats:sub>O<jats:sub>8</jats:sub> (as determined by x-ray diffraction) has been synthesized in flowing oxygen. Pellets of Ba<jats:sub>2</jats:sub>YCu<jats:sub>4</jats:sub>O<jats:sub>4</jats:sub> fabricated from the mixed oxides were prepared and partially sintered by firing at 800 \u00b0C in flowing oxygen for 50 h. Resistivity and magnetic (AC) susceptibility measurements show onset <jats:italic>T</jats:italic><jats:sub><jats:italic>c</jats:italic></jats:sub>'s of 82\u201384 and 72\u201373 K, respectively.</jats:p>",
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