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Preparation of Monodispersed Y‐Ba‐Cu‐O Superconductor Particles via Sol—Gel Methods
Author(s) -
Sanjinéls Rosendo,
Thampi K. Ravindranathan,
Kiwi John
Publication year - 1988
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1988.tb05822.x
Subject(s) - thermogravimetry , oxalate , transmission electron microscopy , materials science , superconductivity , amorphous solid , particle size , homogeneity (statistics) , x ray crystallography , diffraction , nuclear chemistry , analytical chemistry (journal) , mineralogy , chemical engineering , crystallography , inorganic chemistry , chemistry , nanotechnology , chromatography , condensed matter physics , mathematics , optics , physics , statistics , engineering
The high‐T c superconducting material YBa 2 Cu 3 O 7‐ x was synthesized using a modified amorphous citrate or oxalate process. Phase‐pure superconducting powders were obtained by firing the citrate precursor to 900°C and the oxalate precursor to 950°C inflowing O 2 . The preparation is highly reproducible and leads to powders with excellent homogeneity and sinterability. The resulting material was examined by transmission electron microscopy, thermogravimetry, and X‐ray diffraction. Particle sizes for the superconductors obtained varied from 75 to 3300 Å (7.5 to 330 nm).