Title :
Cracking of rare earth barium cuprate films prepared by liquid phase epitaxy
Author :
Aichele, T. ; Gornert, P. ; Uecker, R. ; Muhlberg, M.
Author_Institution :
INNOVENT e.V., Jena, Germany
fDate :
6/1/1999 12:00:00 AM
Abstract :
A high growth rate of REBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (RE=rare earth elements) superconducting films is achieved with liquid phase epitaxy. The occurrence of cracks is one of the major problems for applications of these thick films. To achieve crack free films, it is necessary to understand the formation of cracks in REBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// films. Investigations were carried out on YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// and (Y,Pr)Ba/sub 2/Cu/sub 3/O/sub 7-/spl delta// films on NdGaO/sub 3/ substrates and on new SrPrGaO/sub 4/ substrates with tetragonal K/sub 2/NiF/sub 4/ structure (space group I4/mmm). A thermodynamic model for understanding the crack spacing together with mechanical properties determined in melt textured YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// bulk samples was applied.
Keywords :
barium compounds; cracks; high-temperature superconductors; liquid phase epitaxial growth; rare earth compounds; superconducting epitaxial layers; NdGaO/sub 3/; REBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//; SrPrGaO/sub 4/; crack free films; crack spacing; high growth rate; high temperature superconductor; liquid phase epitaxy; mechanical properties; rare earth barium cuprate films cracking; thermodynamic model; Barium; Capacitive sensors; Cooling; Epitaxial growth; Spirals; Substrates; Superconducting films; Temperature; Thermal stresses; Thick films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
