Title :
New particles technology for oxide-superconductor using dry- and wet-type jet mill
Author :
Kezuka, Hirosi ; Kato, Isamu ; Shirane, Tosiki ; Ikeda, Masaaki
Author_Institution :
Tokyo Univ. of Technol., Japan
Abstract :
Superconducting YBCO particles with an average size of 1-2 μm were prepared by dry-type jet mill. It is found from the measurements of critical currents (Ic) that the superconducting transition temperature (Tc) at 91-92 K is obtained for the YBCO particles which have oriented and elongated grains align parallel to (003) (005) and (006)-plane. On the other hand, fine YBCO particles were prepared from high quality superconducting YBCO powders by wet-type jet mill in a high pressure now of MEK (methyl-ethyl-ketone:CH3COCH2CH3) or toluene (C6H5CH3). As a result, the resulting particles are homogenius in MEK and fine YBCO particles show oriented and polycrystal structures with an average particle size of 164 nm in diameter and with the lattice parameter of a=3.9 A, b=3.5 A in [001]-orientation from TEM (Transmission Electron Microscopy)-studies
Keywords :
barium compounds; critical current density (superconductivity); high-temperature superconductors; particle size; powders; superconducting transition temperature; yttrium compounds; 1 to 2 mum; 91 to 92 K; TEM; YBCO particles; YBa2Cu3O; critical currents; dry-type jet mill; high quality superconducting YBCO powders; high temperature superconductor; lattice parameter; oxide-superconductor; superconducting transition temperature; wet-type jet mill; Critical current; Current measurement; Electrons; Lattices; Milling machines; Particle measurements; Powders; Superconducting integrated circuits; Superconducting transition temperature; Yttrium barium copper oxide;
Conference_Titel :
Properties and Applications of Dielectric Materials, 2000. Proceedings of the 6th International Conference on
Conference_Location :
Xi´an
Print_ISBN :
0-7803-5459-1
DOI :
10.1109/ICPADM.2000.876349
