Crystallization and resistivity studies on Bi4Sr3Ca3CuyOx glasses

✍ Scribed by E. Zacharias; R. Singh

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 690 KB
• Volume: 247
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(95)00210-3

✦ Synopsis

Studies on Bi4Sr3Ca3CuyOx (433y) glasses (3< y <6) and corresponding glass ceramics are reported. No definite correlation is found between the properties of the glasses and the superconducting glass ceramics. The detailed studies, including Differential Scanning Calorimetric, Resistivity and X-ray diffraction, on 4334 glass and glass ceramics show that the activation energy for crystallization is 388 KJ/mol.; the devitrification reaction rate is maximum in the 500-650°C temperature range; Bi2Sr2CuOx (Bi-2201) is the first phase which crystallize from the glass and the crystallization is a bulk phenomenon. Metal-insulator transition is observed for RT resistivity 10-21) cm. The BizSr2CatCu2Ox (Bi-2212) phase formation starts above 650°C by a diffusion reaction between Bi-2201 phase, Ca, Cu and O at the sample surface.