Abstract
We developed an all-iodide precursor approach to grow epitaxial YBa2Cu3O7-y (YBCO) films on single crystal substrates. The respective metal iodides were used as the starting materials. Initially, yttrium and barium iodides were dissolved in 2-methoxyethanol, whereas copper iodide was dissolved in ammonium iodide/dimethylformamide solution. The solutions were mixed together and concentrated to give a 2.5-M total cation precursor solution. The precursor solutions were spin coated on SrTiO3 (100) substrates and heat-treated at 800-830 °C in 300 ppm oxygen atmospheres. X-ray diffraction (XRD) results from the theta-2theta (θ-2θ) scan, omega (ω) and phi (φ) scans for the films revealed a (100) cubic texture. The full-width-at-half-maximum (FWHM) values for YBCO (105) and YBCO (005) were 1.3° (in-plane epitaxy, Δφ) and 0.42° (out-of-plane epitaxy, Δω), respectively. The YBCO films had a Tc of 90.3 K. The measured transport Jc, critical current density was 1.3×105 A/cm2 at 77 K and self-field.
| Original language | English |
|---|---|
| Pages (from-to) | 127-132 |
| Number of pages | 6 |
| Journal | Physica C: Superconductivity and its Applications |
| Volume | 319 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jun 20 1999 |
Funding
The research was sponsored by the Divisions of Materials Sciences, Office of Basic Energy Sciences and Office of Energy Efficiency and Renewable Energy, Office of Utility Technology-Superconducting Program. The research was performed at the Oak Ridge National Laboratory, ORNL, managed by Lockheed Martin Energy Research for the US Department of Energy under contract No. DC-AC05-96OR22464.