| Автор | Q -L Xu |
| Автор | T B Tang |
| Автор | Z -J Chen |
| Дата выпуска | 1994-11-01 |
| dc.description | HgBa<sub>2</sub>CaCu<sub>2</sub>O<sub>6+ delta </sub> has been synthesized through a two-step route, via a precursor but under controlled Hg vapour pressure during the second step. A calculated excess quantity of HgO was put along the precursor, whereon the latter reacted with a stoichiometric amount of the former. Annealing raised the superconducting critical temperature from 97 to 127 K, according to susceptibility measurements. Correspondingly, the lattice parameters also increased. Microwave non-resonant absorption experiments indicated a minute presence of Hg-1223. The thermal stability of Hg-1212 was studied with the help of thermogravity, differential thermal analysis, mass spectroscopy, and X-ray diffractometry. Decomposition became significant above 600 degrees C, but the out-diffusion followed by evaporation of Hg proceeded more slowly; the enthalpies of these two processes were approximately 43 and 130 kJ mol<sup>-1</sup>. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | The synthesis and thermal stability of superconducting HgBa<sub>2</sub>CaCu<sub>2</sub>O<sub>6+ delta </sub> |
| Тип | paper |
| DOI | 10.1088/0953-2048/7/11/010 |
| Electronic ISSN | 1361-6668 |
| Print ISSN | 0953-2048 |
| Журнал | Superconductor Science and Technology |
| Том | 7 |
| Первая страница | 828 |
| Последняя страница | 831 |
| Аффилиация | Q -L Xu; Dept. of Phys., Hong Kong Baptist Coll., Kowloon, Hong Kong |
| Аффилиация | T B Tang; Dept. of Phys., Hong Kong Baptist Coll., Kowloon, Hong Kong |
| Аффилиация | Z -J Chen; Dept. of Phys., Hong Kong Baptist Coll., Kowloon, Hong Kong |
| Выпуск | 11 |
