Reduced crystallization time of YBCO in a fluorine-free MOD process using uv-lamp irradiation |
| |
Authors: | H Matsui K Tsukada T Tsuchiya M Sohma I Yamaguchi T Kumagai T Manabe |
| |
Institution: | 1. Superconductivity Research Laboratory/ISTEC, Tokyo, Japan;2. Waseda University, Tokyo, Japan |
| |
Abstract: | We have studied the crystallization time dependence of the epitaxial YBCO films (t = 0.8 μm) grown on CeO2-buffered SrTiO3 substrates by fluorine-free metal–organic deposition using uv-lamp irradiation (uv-MOD). As increasing the time (T0) for heat treatment at the reaction temperature (760 °C) from 0 to 90 min, Jc and the YBCO 0 0 l XRD intensity are steeply increased and reach their maximum values at T0 = 10 min. This suggests that the heat treatment required for YBCO crystallization is significantly shortened in uv-MOD compared to conventional all-pyrolytic F-free MOD processes, which consume T0 = 90–150 min for crystallizing 0.4–0.5-μm-thick films. Scanning electron microscope measurement revealed a drastic change in surface morphology between T0 = 8 and 10 min, showing a good correspondence to the Jc and XRD data which suggest that the epitaxial growth reaches the film surface at the very early stage in the heat treatment. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|