Preparation of the High-Tc Superconductor YBa2Cu3O(7-x) Using Organometallic Precursors
Author: Leonard V. Interrante
Publisher:
Published: 1988
Total Pages: 18
ISBN-13:
DOWNLOAD EBOOKOrganic soluble precursors to the high Tc 1-2-3 superconductor, YBa2Cu3O7-x, have been prepared using polyesters derived from the interaction of citric acid (CA) or ethyl-enediaminetetraacetric acid (EDTA) with ethylene glycol. Mixtures of the nitrate, carbonate and/or acetate salts of the three metal ions with CA or EDTA and ethylene glycol were heated to obtain homogeneous green solids containing the desired 1:2:3 ratios of Y3+, Ba2+, and Cu2+ ions. Pyrolysis at 850C-960C in oxygen gave the superconducting, orthorhombic, YBa2Cu3O7-x phase. Films of the superconductor were prepared by dropping ethylene glycol solutions of these precursors onto zirconia and alumina substrates, followed by pyrolysis to 950 C in O2. The results of TGA/DSC and FTIR studies of these precursors, as well as XRD, FTIR, pyrolysis/GC, electrical and magnetic property measurements on the pyrolysis products are presented and discussed in the context of the probable precursor structures and pyrolysis chemistry. Keywords: Superconductor, Precursor, Thin films, Copper oxides, Yttrium compounds, Barium compounds. (MJM).