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Preparation of YBa2Cu3O7−x precursors from a fused eutectic of sodium and potassium hydroxides

  • Nicholas Coppa (a1), Daniel H. Nichols (a1), John W. Schwegler (a1), J. E. Crow (a1), G. H. Myer (a1) and R. E. Salomon (a1)...

Abstract

A method for preparing YBa2Cu3O7−x from the simultaneous thermal decomposition of the nitrates of yttrium, barium, and copper in an anhydrous fused eutectic of sodium and potassium hydroxide is described. This method eliminates the need for any mechanical grinding or the introduction of carbon containing anions. Products formed are fine powders (∼1 μm) having mole ratios 1.00Y:2.00Ba:3.06Cu.X-ray diffraction analyses reveal that the initial products are Y(OH)3, BaO2, and CuO, which when air calcinated/oxygen annealed at 900–950 °C form the superconducting YBa2Cu3O7−x A mechanism is postulated for product formation as a function of reaction conditions.

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Preparation of YBa2Cu3O7−x precursors from a fused eutectic of sodium and potassium hydroxides

  • Nicholas Coppa (a1), Daniel H. Nichols (a1), John W. Schwegler (a1), J. E. Crow (a1), G. H. Myer (a1) and R. E. Salomon (a1)...

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