Obtaining YBa2Cu3O
y
crystals via YO1.5-BaO-CuO
x
melt electrolysis |
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| Authors: | L A Klinkova V I Nikolaichik N V Barkovskii A F Shevchun V K Fedotov |
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| Institution: | 1. Institute of Solid-State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia
2. Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia
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| Abstract: | Mass transfer during the melt electrolysis of Y0.02Ba0.30Cu0.70O y and Y0.02Ba0.25Cu0.75O y samples is investigated at a temperature of 950°C (0.5 h) and a current of 5–1050 A in a cell. Crystal deposits of YBa2CVu3O6 + δ tetragonal oxide (123) are grown, and their cation composition and structure are investigated by means of X-ray phase analysis, electron diffraction, elemental analysis, and high resolution on a transmission electron microscope. Deviation of the cation composition of oxide (123) from the stoichiometric ratio and its nanostructured state at nanocrystallite sizes of 2–5 nm are observed. The temperature dependence of magnetic susceptibility after oxygen annealing (450°C, 1 h) has four curve bends, indicating there are four superconducting phases with T s = 45, 52, 75, and 86 K. |
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