ISSN:
1572-9605
Keywords:
Superconductor synthesis
;
liquid ammonia
;
solution pyrolysis
;
freeze drying
;
chemical solidification
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract YBa2Cu3O7−x (123) superconducting powders have been advantageously prepared from liquid ammonia solutions of nitrate, acetate, and perchlorate precursors. The synthetic techniques used include solution pyrolysis, freeze drying, and chemical solidification by reaction with a Lewis acid. Metal stoichiometry was determined by gravimetric analysis and atomic absorption spectroscopy. Phase characterization was accomplished by powder X-ray diffraction which revealed at least 98% pure 123 for some samples. Resistivity and magnetic susceptibility measurements confirm the superconducting properties of the products with critical temperatures around 90 K. Finally, chemical and superconducting properties are discussed as a function of process parameters.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00618218
Permalink