Sol-gel Tb2O3 buffer layers on Ni tapes for YBCO coated conductors
2002 Applied Superconductivity Conference, Houston, TX, Amerika Birleşik Devletleri, 4 - 09 Ağustos 2002, cilt.13, ss.2669-2672, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Cilt numarası: 13
- Doi Numarası: 10.1109/tasc.2003.811946
- Basıldığı Şehir: Houston, TX
- Basıldığı Ülke: Amerika Birleşik Devletleri
- Sayfa Sayıları: ss.2669-2672
- Anahtar Kelimeler: Buffer layers and YBCO, Sol-gel, Tb2O3
- Ankara Yıldırım Beyazıt Üniversitesi Adresli: Hayır
Özet
In this study, processing of Tb2O3 buffer layers on textured Ni tapes were evaluated for YBa2Cu3O7-x (YBCO) coated conductor. A solution deposition process was used to grow textured Tb2O3 buffer layers on the Ni tapes. The solution was prepared using Tb-2, 4-pentanedionate precursor, methanol as solvent, chelating agents and a solution modifying chemical, triethanolamine (TEA). Biaxially textured Ni substrates were dipped into the solution by a reel-to-reel sol-gel dip coating system. The amorphous thin films were dried at 300°C for 30 sec and then heat-treated at 500°C for 2 min in air using an in-line three-zone furnace. The films were annealed at temperature range of 900°C and 1170°C for 10 to 20 min under 4%H2-Ar gas flow. The textured buffer layers were obtained using TEA onto the textured Ni tapes at 1150°C for 10 minutes. The Tb2O3 (222) pole figure revealed a single cube-on-cube texture. The omega and phi scans indicated good out-of-plane and in-plane orientations. DTA results pointed out that Tb based gel film transformed to oxide structure at temperature range of 350°C and 410°C. Microstructures of the Tb2O3 films were investigated by Environmental Scanning Electron Microscope (ESEM), and the films were dense, smooth and free from cracks and pinholes.