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High-pressure synthesis and heat treatments of the HgBa2Ca4Cu5O12+delta and HgBa2Ca5Cu6O14+delta phasesстатья
Информация о цитировании статьи получена из
Scopus,
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: Capponi J.J., Kopnin E.M., Loureiro S.M., Antipov E.V., Gautier E., Chaillout C., Souletie B., Brunner M., Tholence J.L., Marezio M.
- Журнал: Physica C: Superconductivity and its Applications
- Том: 256
- Номер: 1-2
- Год издания: 1996
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 1
- Последняя страница: 7
- DOI: 10.1016/0921-4534(95)00635-4
- Аннотация: The syntheses of the n = 5 and n = 6 members of the HgBa2Can-1CunO2n+2+delta family are reported. Bulk samples containing either Hg-1245 or Hg-1256 as major phases were synthesized using the high-pressure high-temperature technique at 920 degrees C and 18 kbar. The as-synthesized phases (a = 3.8547(3) Angstrom, c = 22.156(5) Angstrom for n = 5 and a = 3.8516(1) Angstrom, c = 25.232(6) Angstrom for n = 6) exhibited T-c with onsets of about 100 K. They were characterized by X-ray powder diffraction, transmission electron microscopy and AC susceptibility measurements. Heat treatments increased the T-c onset to 110 K for n = 5 and to 107 K for n = 6. These phases with high n are more inert to thermal annealings under different atmospheres than the members with smaller n. Only strong oxidizing {P(O-2) greater than or equal to 500 bar} or reducing {Ar/400 degrees C} conditions can induce significant T-c variations.
- Добавил в систему: Антипов Евгений Викторович