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標題: Electrochemical crystal growth of superconducting cuprates
作者: Samata, H.
Komiyama, T.
Tsuboi, S.
Nagata, Y.
Uchida, T.
Ohtsuka, M.
Lan, M.D.
關鍵字: oxides
crystal growth
X-ray diffraction
期刊/報告no:: Journal of Physics and Chemistry of Solids, Volume 58, Issue 10, Page(s) 1547-1552.
摘要: An electrochemical method was applied to grow crystals of La2CuO4 and Nd2CuO4 at temperatures below 400 degrees C in a zirconium bath using molten NaOH as an electrolyte. The La2CuO4 crystal grown at 320 degrees C shows superconductivity with the onset transition temperature of 25 K without any heat treatment in oxygen. The results of EPMA, AES and iodometory revealed that the crystal is oxygen rich La2CuO4+delta without any substitution of La by Na. The crystals seem to be highly oxidized in the process of the electrochemical deposition. in the case of Nd2CuO4, crystals were grown at 380 degrees C. However, the substitution of Nd by a large amount of Ce was unsuccessful. (C) 1997 Elsevier Science Ltd.
ISSN: 0022-3697
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