Premium
Superconductive Properties of the YBa 2 Cu 4 O 8 Superconductor
Author(s) -
Sarkar Asok K.,
Kozlowski Gregory,
Maartense Iman
Publication year - 1990
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.1151-2916.1990.tb06729.x
Subject(s) - superconductivity , magnetization , materials science , sintering , powder diffraction , condensed matter physics , diffraction , phase (matter) , critical current , magnetic susceptibility , transition temperature , x ray crystallography , analytical chemistry (journal) , metallurgy , chemistry , magnetic field , crystallography , optics , physics , organic chemistry , quantum mechanics , chromatography
A bulk density of 85% of the theoretical density was achieved by sintering a powder compact of YBa 2 Cu 4 O 8 (124) at 850°C in flowing oxygen at 1 atm (≅10 5 Pa). This value is very close to that obtained by the hot isostatic pressure technique (90%). The superconducting properties of the sample were characterized by magnetization and ac susceptibility techniques. The magnetization critical current density at 20 K in zero field was determined to be ∼5 × 10 4 A/cm 2 , and the superconducting transition temperatures were found to be 77 K for the bulk material and 82 K for the granular phase. The powder X‐ray diffraction and ac susceptibility studies revealed the sintered 124 material to be single phase.