STRUCTURAL DEFECTS IN YBA2CU2COO6+X AND YBACUCOO5

被引:10
作者
JACOB, M
HANSEN, S
STUREFELT, S
机构
来源
MICROSCOPY MICROANALYSIS MICROSTRUCTURES | 1990年 / 1卷 / 5-6期
关键词
D O I
10.1051/mmm:0199000105-6031900
中图分类号
TH742 [显微镜];
学科分类号
摘要
YBa2Cu2CoO6+x and YBaCuCoO5 were prepared at 900-degrees-C. Tetragonal unit cells determined by electron and x-ray diffraction: YBa2Cu2CoO6+x prepared in air, a = 3.88, c = 11.66 angstrom and YBaCuCoO5, a = 3.87, c = 7.56 angstrom. A variation in c of 11.61 to 11.73 angstrom was caused by the oxygen non-stoichiometry in YBa2Cu2CoO6+x. The unit cell size of YBaCuCoO5 was constant, indicating a stoichiometric phase. Imaging and electron diffraction reveal that the triple-layer perovskite YBa2Cu2CoO6+x contains double-layer defects, while the double-layer structure of YBaCuCoO5 exhibits triple-layer defects. X-ray microanalysis indicated defects with a decreased Ba/Y ratio in YBa2Cu2CoO6+x and an increased Ba/Y ratio in YBaCuCoO5. The Co/Y ratios remained fairly constant in both compounds, when defect and well-ordered areas were compared.
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页码:319 / 326
页数:8
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