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Open AccessArticle

Synthesis of a Metal Oxide by Forming Solvate Eutectic Mixtures and Study of Their Synthetic Performance under Hyper- and Hypo-Eutectic Conditions

1
Nagaoka University of Technology, 1603-1, Kamitomioka Nagaoka, Niigata Prefecture 940-2188, Japan
2
Complex Functional Materials Group, School of Chemistry, University of Bristol, Bristol BS8 1TS, UK
*
Authors to whom correspondence should be addressed.
Crystals 2020, 10(5), 414; https://doi.org/10.3390/cryst10050414
Received: 29 April 2020 / Revised: 15 May 2020 / Accepted: 18 May 2020 / Published: 21 May 2020
(This article belongs to the Section Inorganic Crystalline Materials)
The synthesis of YBa2Cu3O7−x (YBCO or 123) superconductor was carried out under hyper- and hypo-eutectic conditions with different ammonium compounds, i.e., ammonium nitrate, formate, acetate, carbonate, bicarbonate, and tetramethylammonium nitrate. The aim was to find more affordable synthetic pathways using highly available and cheaper compounds, as well as to study the crystal formation under no-carbon conditions when ammonium nitrate was employed. Best results were obtained when eutectic conditions were achieved, namely by ammonium nitrate and YBaCu nitrates in a 5:1 molar ratio (81% of the superconductor). Ammonium formate, acetate, carbonate, and bicarbonate did not produce eutectic mixes. Temperature analysis of the reaction carried out by ammonium nitrate/YBaCu nitrates indicated the formation of barium carbonate, despite no carbon source being used in this reaction. This phenomenon is further discussed in this work. Consequently, tetramethylammonium nitrate, as a chelator and carbon source, was used, providing >96% of the superconductor. View Full-Text
Keywords: metal-containing eutectic mixtures; high-temperature superconductor; metal oxide; ammonium compounds metal-containing eutectic mixtures; high-temperature superconductor; metal oxide; ammonium compounds
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Gómez Rojas, O.; R. Hall, S.; Nakayama, T. Synthesis of a Metal Oxide by Forming Solvate Eutectic Mixtures and Study of Their Synthetic Performance under Hyper- and Hypo-Eutectic Conditions. Crystals 2020, 10, 414.

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