| Автор | W Zhou |
| Автор | D A Jefferson |
| Автор | W Y Liang |
| Дата выпуска | 1993-02-01 |
| dc.description | The authors have investigated the surface chemistry of superconducting YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7- delta </sub> using high-resolution electron microscopy. Specimens crushed in air showed a thick 'amorphous' coating, which would not recrystallize into the bulk structure under electron beam annealing. Instead oxide microcrystals formed within the coating. The amorphous coating layers were reduced to less than half of their original thickness when the specimens were crushed in argon, and were found to recrystallize into the YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7- delta </sub> structure under the same conditions, with atomically clean surfaces produced and observed directly in the profile images. It was also found that the (001) surface terminated with the Cu-O chain. Surface reconstruction with a double atomic layer of Cu covering the (113) and (112) surfaces was confirmed by computer simulation of the profile images. Possible mechanisms of formation of the coating and clean surfaces are discussed. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | HREM studies of surface chemistry of superconducting YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7- delta </sub> |
| Тип | paper |
| DOI | 10.1088/0953-2048/6/2/002 |
| Electronic ISSN | 1361-6668 |
| Print ISSN | 0953-2048 |
| Журнал | Superconductor Science and Technology |
| Том | 6 |
| Первая страница | 81 |
| Последняя страница | 90 |
| Аффилиация | W Zhou; IRC in Superconductivity, Cambridge Univ., UK |
| Аффилиация | D A Jefferson; IRC in Superconductivity, Cambridge Univ., UK |
| Аффилиация | W Y Liang; IRC in Superconductivity, Cambridge Univ., UK |
| Выпуск | 2 |
