Electron beam induced oxygen in YBa2Cu3O(7-x) superconductors
Abstract
Thin foils of bulk YBa2Cu3O(sub 7-x) YBCO superconductors were subjected to electron irradiation in a Transmission Electron Microscope (TEM). The resulting disordering of the oxygen atoms and vacancies in the Cu-O planes was monitored by measuring the splitting of the (110) diffraction spots in the (001) diffraction pattern. Samples were irradiated at 83K with 100, 150, 200 and 300kV electrons. The 100kV electrons did not cause any disordering, even after prolonged irradiation. The results of the higher energy irradiations showed an excellent fit to a disordering model, indicating a lack of radiation assisted ordering at 83K. This was further confirmed by the insensitivity of the disordering to the dose rate of 300kV electrons at 83K. However, at 300K, an increase in the dose rate of 300kV electrons increased the disordering rate, indicating that radiation assisted reordering was occurring at that temperature.
- Publication:
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Presented at the Materials Research Society Fall Meeting
- Pub Date:
- November 1989
- Bibcode:
- 1989mrs..meetT....B
- Keywords:
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- Crystal Structure;
- Electron Beams;
- Electrons;
- Oxygen;
- Radiation Effects;
- Superconductors;
- Barium Oxides;
- Copper Oxides;
- Electron Microscopy;
- Yttrium Oxides;
- Solid-State Physics