Microstructure of screen-printed (Tl0.5,Pb0.5)(Sr0.8,Ba0.2)2Ca2Cu3Oy superconducting films on untextured silver substrate

✍ Scribed by Bong-Jun Kim; Hyun-Tak Kim; Yoshio Matsui; Dae-Yong Jeong; Christian Deinhofer; Gerhard Gritzner

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 225 KB
• Volume: 460-462
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2007.03.159

✦ Synopsis

Highly c-axis oriented (Tl 0.5 ,Pb 0.5 )(Sr 0.8 ,Ba 0.2 ) 2 Ca 2 Cu 3 O y films with a thickness of 1.5 lm and 4 lm were prepared by screen printing method on untextured silver substrates. Tl-1223 films have the critical temperatures around 116 K with transition widths, DT, of 2 K, The microstructures have been investigated by high-resolution transmission electron microscopy. Tl-1223 film deposited on well-polished Ag substrate shows large single domains in the lateral direction including secondary phases and intergrowth of Tl-1212, 2201 and 1234. From selected area electron diffraction (SAED) pattern, secondary phase is determined as BaCuO 2 , which plays an important role in flux pinning to improve magnetic properties. And the relationships between the domain size, alignment and the surface roughness are studied.