Hts Logo

NIST High Temp. Superconducting Materials (HTS) Database:

NIST Standard Reference Database 62

Last Update to Data Content: 1996

DOI: https://doi.org/10.18434/T4KP8J

Bibliographic Information

Title: Effect of Hydrogen Reduction on the Structure and Conductivity of YBa2Cu3Oy
Author(s): M. Qi, P. Lee, R. Li, P. Coppens, and J.H. Wang
Publication: Physica C Volume: 174 Issue: Not Available Year: 1991 Page(s): 23-27
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Crystallography, Critical Current Density

Materials and Properties

Y:123; [Y-Ba-Cu-O]
Material Specification for Y:123; [Y-Ba-Cu-O] Process: Solid State Reaction
Notes: "Pellets of YBa2Cu3Oy used were made by solid state reaction. About 0.5 g powdered YBA2Cu3Oy...was pressed at 200kg/cm2 into 12.5 diam. pellets. The pellets were heated in air to 940 °C in 2 h and kept at 940 °C for 2 h, and then cooled to room temperature. These pellets were subsequently annealed at 550-600 °C in an oxygen atmosphere for 6 h to form the pure superconductor phase... pellets with lower oxygen contents were made by reduction with 10% by volume H2 in N2 at 200 °C for 1-2 h."
Formula: YBa2Cu3Oy
Informal Name: Y:123
Chemical Family: Y-Ba-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Crystallography for Y:123; [Y-Ba-Cu-O]
Crystal System: Orthorhombic
Formula Units per Cell:
Space Group:
Cell Parameters
Specimen Condition () Temp K a Å b Å c Å
oxidized 296 3.8191(1) 3.8842(1) 11.6916(1)
reduced 296 3.88353(2) 3.8864(3) 11.6983(4)
Measurement Method: X-ray diffraction
"The crystal structures... were characterized by X-ray diffraction using synchrotron radiation....Twenty scans with steps of 0.02° were used for data collection in the 20° < 2θ < 90° range. The data were analyzed by Rietveld refinement using the pseudo-Voigt peak shape function."

Cautions: Evaluated Data
Critical Current Density for Y:123; [Y-Ba-Cu-O]
Specimen Condition () Temperature (K) Magnetic Field (T) Critical Current Density (kA/cm2)
oxidized 77 0.1 0.23
oxidized 77 0.5 0.18
oxidized 77 1.7 0.12
oxidized 77 1.5 0.08
oxidized 77 2.0 0.06
oxidized 77 2.5 0.05
oxidized 77 3.1 0.04
oxidized 77 3.5 0.04
oxidized 77 4.0 0.03
oxidized 77 4.5 0.02
oxidized 77 5.0 0.02
oxidized 20 0.5 7.56
oxidized 20 1.0 4.53
oxidized 20 1.5 3.16
oxidized 20 2.0 2.58
oxidized 20 2.5 2.15
oxidized 20 3.0 1.93
oxidized 20 3.5 1.85
oxidized 20 4.1 1.70
oxidized 20 4.5 1.56
oxidized 20 5.0 1.41
oxidized 5 0.5 24.53
oxidized 5 1.0 17.43
oxidized 5 1.5 13.05
oxidized 5 2.0 10.31
oxidized 5 2.5 9.21
oxidized 5 3.0 7.83
oxidized 5 3.5 7.27
oxidized 5 4.0 6.44
oxidized 5 4.5 5.61
oxidized 5 5.0 5.05
reduced 77 0.1 0.06
reduced 77 0.5 0.05
reduced 77 1.0 0.04
reduced 77 1.5 0.03
reduced 77 2.0 0.03
reduced 77 2.5 0.03
reduced 77 3.0 0.03
reduced 77 3.5 0.03
reduced 77 3.9 0.03
reduced 77 4.5 0.02
reduced 77 5.0 0.02
reduced 20 0.5 1.38
reduced 20 1.0 0.80
reduced 20 1.5 0.60
reduced 20 2.0 0.42
reduced 20 2.5 0.28
reduced 20 3.0 0.27
reduced 20 3.5 0.20
reduced 20 4.0 0.19
reduced 20 4.5 0.12
reduced 20 5.0 0.12
reduced 5 0.5 5.39
reduced 5 1.0 3.76
reduced 5 1.5 2.94
reduced 5 2.0 2.39
reduced 5 2.5 1.84
reduced 5 3.0 1.54
reduced 5 3.5 1.54
reduced 5 4.0 1.26
reduced 5 4.5 1.26
reduced 5 5.0 1.00
Measurement Method: SQUID magnetometer
"Rectangular bars with dimensions of 6x1.5x0.3mm3 were cut from the sample pellets for the measurement of the critical current density by means of SQUID, with the direction of the magnetic field H parallel to the long dimension of the sample." The values of Jc were determined using the Bean formula.

Cautions: Evaluated Data
Digitized data were obtained from Figure 4 of the paper.