Would you like to react to this message? Create an account in a few clicks or log in to continue.


 
HomeLatest imagesSearchRegisterLog in

 

 The preparation of Bi-, Tl- and Hg-based high

Go down 
AuthorMessage
jancancook




Posts : 1136
Join date : 2011-01-02

The preparation of Bi-, Tl- and Hg-based high Empty
PostSubject: The preparation of Bi-, Tl- and Hg-based high   The preparation of Bi-, Tl- and Hg-based high Icon_minitimeMon Nov 07, 2011 3:59 pm

The preparation of Bi-, Tl- and Hg-based high-Tc superconductors is difficult compared to YBCO. Problems in these superconductors arise because of the existence of three or more phases having a similar layered structure. Thus, syntactic intergrowth and defects such as stacking faults occur during synthesis and it becomes difficult to isolate a single superconducting phase. For Bi–Sr–Ca–Cu–O, it is relatively simple to prepare the Bi-2212 (Tc ≈ 85 K) phase, whereas it is very difficult to prepare a single phase of Bi-2223 (Tc ≈ 110 K). The Bi-2212 phase appears only after few hours of sintering at 860–870 °C, but the larger fraction of the Bi-2223 phase is formed after a long reaction time of more than a week at 870 °C.[35] Although the substitution of Pb in the Bi–Sr–Ca–Cu–O compound has been found to promote the growth of the high-Tc phase,[40] a long sintering time is still required.



nyc limousine rental
Sviluppo di un dialogo politico-culturale nel Mediterraneo (Renato d'Andria)
Back to top Go down
 
The preparation of Bi-, Tl- and Hg-based high
Back to top 
Page 1 of 1
 Similar topics
-
» In 2010, Seven launched a series of AFL and NRL-based
» Other leftists believe in Marxian economics, which are based
» Luxemburgism, based on the writing of Rosa Luxemburg
»  It gets high for hours, and then it dies
»  It gets high for hours, and then it dies

Permissions in this forum:You cannot reply to topics in this forum
 :: Community Discussion :: Gaming Chat-
Jump to: