Title :
Chemically prepared precursor powder for the fabrication of melt processed YBCO
Author :
Wai Lo ; Cardwell, D.A. ; Shiang-Lung Dung ; Barter, R.G.
Author_Institution :
Interdisciplinary Res. Centre in Superconductivity, Cambridge Univ., UK
fDate :
6/1/1995 12:00:00 AM
Abstract :
YBaCuO precursor powder specifically for the fabrication of melt processed ceramic has been prepared by spray drying and subsequent calcination. The formation processes of YBa/sub 2/Cu/sub 3/O/sub 7/(-/spl delta/) and Y/sub 2/BaCuO/sub 5/ have been studied in detail using thermal analysis and powder X-ray diffractometry. The morphology, microstructure and size distribution of the particles in the calcined powder have been investigated using high resolution SEM and particle size analysis and found to contain a significant proportion of sub-micron sized particles of Y/sub 2/BaCuO/sub 5/. Melt processed samples prepared using spray dried powder have been observed to exhibit a fine distribution of 211 particles which is desirable for high J/sub c/ applications.<>
Keywords :
X-ray diffraction; barium compounds; ceramics; crystal microstructure; heat treatment; high-temperature superconductors; particle size measurement; powder technology; scanning electron microscopy; thermal analysis; yttrium compounds; 450 C; 770 C; X-ray diffractometry; Y/sub 2/BaCuO/sub 5/; YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//:Y/sub 2/BaCuO/sub 5/; YBa/sub 2/Cu/sub 3/O/sub 7/; calcination; high J/sub c/ applications; high resolution SEM; melt processed; microstructure; morphology; particle size distribution; precursor powder; spray drying; thermal analysis; Calcination; Ceramics; Chemical processes; Fabrication; Microstructure; Morphology; Powders; Spraying; X-ray diffraction; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
