SUPERCONDUCTIVITY IN HGBA2CA2CU3O8- SYNTHESIZED BY DIFFERENT METHODS(DELTA )

Citation
I. Bryntse et A. Kareiva, SUPERCONDUCTIVITY IN HGBA2CA2CU3O8- SYNTHESIZED BY DIFFERENT METHODS(DELTA ), Materials research bulletin, 30(10), 1995, pp. 1207-1216
Citations number
32
Categorie Soggetti
Material Science
Journal title
ISSN journal
00255408
Volume
30
Issue
10
Year of publication
1995
Pages
1207 - 1216
Database
ISI
SICI code
0025-5408(1995)30:10<1207:SIHSBD>2.0.ZU;2-8
Abstract
The composition and superconducting properties of powder samples of Hg -1223, HgBa2Ca2Cu3O8+delta, were investigated. The specimens were prep ared by a single-step method using individual metal oxides, and by a t wo-step method in which the precursor Ba2Ca2Cu3O7+delta was first synt hesized by sol-gel method and then mixed with HgO. The final annealing was performed in sealed quartz ampoules at 665 degrees C or 860 degre es C, and the purity of the obtained samples was compared. After oxyge n treatment at 300 degrees C for 6 h the samples showed superconductiv ity at a T-C(onset) of approximately 134 K, as determined from AC susc eptibility measurements. The materials were also studied by X-ray powd er diffraction and scanning and transmission electron microscopy.