Sol-Gel preparation and characterization of fluorine substituted Bi(Pb)SCCO-2223 HTSC

✍ Scribed by Lina Ben-Dor; J.H. Greenberg; V. Beilin; D. Shafranek

• Book ID: 103947883
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 358 KB
• Volume: 235-240
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)91690-x

✦ Synopsis

Bi2.xPbxSr2Ca2Cu3OyF0. 7 was prepared by sol-gel using citric acid and ethylen glycol. Thelmodynamic calculations showed that a considerable loss of fluorine is to be expected. The sami ~; were characterized by structural, thermal and physical methods. AAS showed that no appreciable amou~ of lead was lost ;luring sintering. For x=0.35 the highest Tc was observed,viz. 116K(onset). Using a selecti', , fluorine electrode it was found that only up to 10% of the initial fluorine remained. "the EPMA results sho,~ed that up to 90% of the sample contained (BiPb)SCCO-2223 the rest being (SrCa)2Cu3Oy. Fluorine could not i~, detected by this method. Fluorine lead to significant enhancement of the phase formation.