SURFACE PHASE DECOMPOSITION IN Bi2Sr2CaCu2O7-y SINGLE CRYSTALS UNDER NITROGEN IONS IRRADIATION
SHI LEI (石磊), WANG LIANG-BIN (汪良斌), LI XIAO-GUANG (李晓光), WU WEN-BIN (吴文彬), ZHOU GUI-EN (周贵恩), ZHANG YU-HENG (张裕恒)
Laboratory of Structure Analysis, University of Science and Technology of China, Academia Sinica, Hefei 230026, China, and Center for Advanced Studies in Science and Technology of Microstructures, Nianjing 210093, China
Abstract The influence of irradiation by 30 keV nitrogen ions with a fluence 1×1018N+·cm-2 on the crystal structure of single crystal Bi2Sr2CaCu2O7-y was investigated by means of X-ray photoelectron spectroscopy and X-ray diffraction. The irradiation caused a transformation from Bi2Sr2CaCu2O7-y (2212 phase) to Bi2Sr2CuO5-x (2201 phase). It was observed that. a small amount of metallic bismuth with an average thickness of about 6.3nm appeared after the irradiation. The possible reaction mechanism under nitrogen-ion irradiation was discussed.
Received: 03 August 1994
Accepted manuscript online:
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