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High pressure synthesis of Hg-1234 and strongly-overdoped Hg-1223 phasesстатья
Информация о цитировании статьи получена из
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Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 9 ноября 2013 г.
- Авторы: Lokshin K.A., Kuzemskaya I.G., Kulikova L.F., Antipov E.V., Itskevich E.S.
- Журнал: Physica C: Superconductivity and its Applications
- Том: 279
- Номер: 1-2
- Год издания: 1997
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 11
- Последняя страница: 17
- DOI: 10.1016/S0921-4534(97)00084-1
- Аннотация: The Hg-1223 and Hg-1234 phases were synthesized using the program-controlled high pressure chamber. The variation of the oxygen content in the starting oxides mixture 'HgBa2Ca3Cu4Ox', obtained by changing BaO/BaO2 and Cu2O/CuO ratios, influences significantly the phase formation. By varying the pressure (P-s), temperature (T-s), time (t(s)) and oxygen content (x), the optimum synthesis conditions of the Hg-1234 phase were determined with P-s = 2 GPa, T-s = 900 degrees C, t(s) = 2 h and x = 10.2. Using the initial mixture with the high oxygen content (x = 10.6) only Hg-1223 with the lattice constants a = 3.8474(9) Angstrom, c = 15.79(1) Angstrom was obtained. Hg-1223 thus prepared is strongly overdoped and exhibits superconductivity at 118 K, while the treatment in oxygen flow enhanced T-c up to 134 K and cell parameters to a = 3.852(1) Angstrom, c = 15.84(1) Angstrom. Dependence of T-c vs. a-parameter (and consequently, oxygen content delta) for the HgBa2Ca2Cu3O8+delta superconductor has a cupola-shaped character, as found previously for the lower members of the homologous series. (C) 1997 Elsevier Science B.V.
- Добавил в систему: Антипов Евгений Викторович