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- W1971102511 abstract "Degradation mechanisms when films of YBa2Cu3O7−x (YBCO) were formed on sapphire substrates have been studied. The films were synthesized by post-deposition annealings in a wet oxygen atmosphere of coevaporated layers of YBaF2CuO. X-ray diffraction revealed the existence of impurity phases in the annealed samples, the most significant being BaAl2O4, Y2BaCuO5, CuO and Y2O3. Redistribution of the constituents as a function of time was examined by secondary ion mass spectrometry and Rutherford backscattering spectrometry, giving evidence of a Ba redistribution against the interfacial region and an agglomeration of Cu within the film. While zero-resistivity temperatures of 1 μm thick films typically were between 80 and 88 K, magnetic characterization indicated weak coupling between the superconducting grains, resulting in low transport critical currents ⩽ 103 A cm−2 at 77 K. The film properties of YBCO/sapphire were compared with those of YBCO processed in parallel on SrTiO3 or LaAlO3." @default.
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- W1971102511 date "1994-07-01" @default.
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- W1971102511 title "Studies of YBa2Cu3O7−x formation in coevaporated YBaF2CuO thin films on sapphire substrates" @default.
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- W1971102511 doi "https://doi.org/10.1016/0040-6090(94)90802-8" @default.
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