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Partial oxygen pressure and temperature effects on the oxygen content of the Y-Ba-Cu-O meltsстатья
Информация о цитировании статьи получена из
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Дата последнего поиска статьи во внешних источниках: 9 ноября 2013 г.
- Авторы: Hunt R.D., Beahm E.C., Voronin G.F.
- Журнал: Physica C: Superconductivity and its Applications
- Том: 302
- Номер: 2-3
- Год издания: 1998
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 130
- Последняя страница: 136
- DOI: 10.1016/S0921-4534(98)00201-9
- Аннотация: The oxygen content and phase transition temperatures of equilibrated samples with Y:Ba:Cu:O molar ratios of 1:2:3:n (YBa2Cu3Ox phase) and 1:3:4:n (YBa2Cu3Ox + BaCuO2 phases) were determined with a differential thermal analyzer (DTA), a thermal gravimetric analyzer (TGA) and an electrochemical oxygen analyzer. These Y-Ba-Cu-O melts were studied at partial oxygen pressures that ranged from 1 × 105 to 6 Pa and at temperatures from 1200 to 1580 K. The oxygen contents of these melts were determined with hydrogen reduction and the TGA. The oxygen content of the 1:2:3:n melts decreased as the temperature increased and as the partial oxygen pressure decreased. The same pattern for the partial oxygen pressure was observed for the oxygen content in the 1:3:4:n melts. However, at a given partial oxygen pressure, the highest oxygen content in a 1:3:4:n melt was observed at a temperature approximately 100 K above the initial melting temperature. The liquidus temperatures for 1:2:3:n and 1:3:4:n always decreased as the partial oxygen pressures decreased. Finally, the compositions of the melts, which included the formation of YBa3Al2O7.5 in the 1:3:4:n melts, are also discussed. © 1998 Elsevier Science B.V. All rights reserved.
- Добавил в систему: Воронин Геннадий Федорович