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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: Structure and Superconductivity of YBa2(Cu1-xFex)3· Oy Prepared by Vacuum Calcination at 673 K (x=0.02 and 0.06)
Author(s): T. Furukawa, N. Machida, T. Shigematsu, N. Nakanishi, K. Yoshimura, and K. Kosuge
Publication: Physica C Volume: 205 Issue: Not Available Year: 1993 Page(s): 39-44
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Crystallography, Critical Temperature

Materials and Properties

Y:123; [Y-Ba-Cu(Fe)-O]
Material Specification for Y:123; [Y-Ba-Cu(Fe)-O] Process: Solid State Reaction
Notes: "The starting materials...were prepared by a conventional ceramic method from Y2O3 (99.99%), BaCO3 (99.99%), CuO (99.99%) and α-Fe2O3 (99.99%)... 1173 K for 72 ks in air and were slowly cooled to room temperature. They were ground to powders by a planet-type ball mill (zirconia pot and balls)... These powders were annealed in vacuo (base pressure = 10-4 Pa) at 1023 for 7.2 ks. Subsequently they were oxidized at 973 K for 7.2 ks in a pure oxygen atmosphere... These powders were annealed under vacuum at 673 K to obtain specimens with oxygen nonstoichiometry. After various periods of the vacuum annealing, the oxygen contents of specimens were determined by the iodometric titration method."
Formula: YBa2Cu3-xFexOy
Informal Name: Y:123
Chemical Family: Y-Ba-Cu(Fe)-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(Fe)-O]
Crystal System:
Formula Units per Cell:
Space Group:
Cell Parameters
x of Fex (formula units) y of Oy (formula units) Temp K a Å b Å c Å
0.06 6.30 296 3.866 -- 11.798
0.06 6.40 296 3.864 -- 11.775
0.06 6.50 296 3.862 -- 11.752
0.06 6.60 296 3.861 -- 11.728
0.06 6.65 296 3.855 3.864 11.719
0.06 6.70 296 3.852 3.869 11.714
0.06 6.80 296 3.848 3.875 11.695
0.06 6.90 296 3.847 3.878 11.686
0.18 6.40 296 3.869 -- 11.749
0.18 6.50 296 3.870 -- 11.737
0.18 6.60 296 3.870 -- 11.728
0.18 6.90 296 3.880 -- 11.717
Measurement Method: X-ray diffraction
"The crystal structure... was examined by XRD and TEM measurements." No additional measurement details were noted.

Cautions: Unevaluated Data
Digitized data were obtained from Figures 1 and 4 of the paper.
Critical Temperature for Y:123; [Y-Ba-Cu(Fe)-O]
x of Fex (formula units) y of Oy (formula units) Critical Temperature (K)
0.06 6.48 29
0.06 6.56 44
0.06 6.64 51
0.06 6.72 58
0.06 6.83 77
0.06 6.89 89
0.18 6.59 0
0.18 6.70 32
0.18 6.78 46
0.18 6.89 69
0.18 6.95 76
Measurement Method: Ac susceptibility
"Superconducting properties... were determined by AC susceptibility measurements. The T was determined by drawing the tangent to the maximum slope of the magnetization curve and finding its intercept with zero magnetization." No additional measurements details were noted.

Cautions: Evaluated Data
Digitized data were obtained from Figure 5 of the paper.