Title :
Influence of residual phases on the properties of YBa2Cu 2O7-x
Author :
Sargankova, I. ; Diko, P. ; Timko, M. ; Slanco, P. ; Matas, S. ; Mihalik, Matus ; Mihalik, M. ; Bunda, V.
Author_Institution :
Inst. of Exp. Phys., Slovak Acad. of Sci., Kosice, Czechoslovakia
fDate :
3/1/1994 12:00:00 AM
Abstract :
The partial melting in YBaCuO incompletely synthesised powders occurring at temperatures below the peritectic decomposition of the 123 (i.e. YBa2Cu3O7-x) compounds is related to the presence of residual phases. Our results showed that the final ceramic has a high porosity, which is independent of the temperature of sintering, the double grain size distribution and two transition temperatures up to the sintering temperature (940°C) as a consequence of a higher content of the residual carbonate. Sintering at a higher temperature improved the superconducting properties of our ceramics. This progress is connected with the cracking of large grain ceramics and with the decomposition of carbonate BaCO3
Keywords :
barium compounds; ceramics; crystal microstructure; grain size; high-temperature superconductors; porosity; powder technology; sintering; superconducting transition temperature; yttrium compounds; 940 C; BaCO3; BaCO3 decomposition; HTSC; YBa2Cu2O7-x; YBa2Cu2O7; ceramic; grain size distribution; high porosity; partial melting; residual phases; sintering temperature; superconducting properties; transition temperatures; Ceramics; Grain size; Magnetic field measurement; Magnetic susceptibility; Microstructure; Physics; Powders; Superconducting epitaxial layers; Superconducting transition temperature; Superconductivity;
Journal_Title :
Magnetics, IEEE Transactions on
