Direct Observation of Oxygen Atoms in a Tetragonal YBa_2Cu_3O_<7.7> High-T_c Superconductor by Means of Ultra-High-Resolution High Voltage Electron Microscopy
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概要
- 論文の詳細を見る
Using an ultra-high-resolution high-voltage electron microscope (UHR-HVEM) recently installed at National Institute for Research in Inorganic Materials, a tetragonal YBa_2Cu_3O_<7.7> crystal was observed for the [001] as well as [100] orientations with the accelerating voltage of 800 kV, where the damage due to electron irradiation is rather suppressed. Dark spots from oxygens were directly detected in addition to those of Y, Ba and Cu atoms. As a result, the crystal structure was confirmed to be similar to that of the tetragonal YBa_2Cu_3O_<7-x>(x>0.5) crystal so far known. Excess oxygens are considered to be accommodated in the otherwise vacant oxygen sites.
- 社団法人応用物理学会の論文
- 1992-01-15
著者
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MATSUI Yoshio
National Institute for Research in Inorganic Materials
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HORIUCHI Shigeo
National Institute for Research in Inorganic Materials
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MATSUI Yoshio
Environmental Pollution Research Institute of Nagoya City
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Matsui Yoshio
National Institute For Materials Science
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Okai Bin
Faculty Of General Education Kogakuin University
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Matsui Yoshio
Advanced Materials Laboratory National Institute For Materials Science
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Okai Bin
Faculty of General Education, Kogakuin University
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