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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: Aluminum Incorporation in Cuprate Perovskites
Author(s): T. Siegrist, L.F. Schneemeyer, J.V. Waszczak, S.A. Sunshine, N.P.Singh, R.L.Opila, B.Batlogg, L.W.Rupp, D.W.Murphy
Publication: Materials Research Society Symposium Proceedings Volume: 99 Issue: Not Available Year: 1988 Page(s): 973-976
Editor(s): Not Available
Publisher: Materials Research Society
Language: English
Notes: Not Available
Keywords: Material Specification, Crystallography, Critical Temperature

Materials and Properties

Y:123; [Y-Ba-Cu(Al)-O]
Material Specification for Y:123; [Y-Ba-Cu(Al)-O] Process: Melt Processed
Notes: The authors cite L.F. Schneemeyer et al., Nature, August 15, 1987, and summarize the procedure as follows. "Single crystals were grown from barium oxide-copper oxide partial melts contained in Al2O3 crucibles..."
Formula: YBa2Cu3-xAlxO7-y
Informal Name: Y:123
Chemical Family: Y-Ba-Cu(Al)-O
Chemical Class: Oxide
Structure Type: Single Crystal
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Crystallography for Y:123; [Y-Ba-Cu(Al)-O]
Crystal System: Tetragonal
Formula Units per Cell: 1
Space Group: P4/mmm
Cell Parameters
x of Alx (formula units) Occupancy () Temp K a Å b Å c Å
0.22 -- 296 3.8637(2) -- 11.7231(7)
Atomic Coordinates
x of Alx (formula units) Occupancy () Atom Temp K a-axis b-axis c-axis
0.22 -- Ba 296 0.5 0.5 0.19016(8)
0.22 -- Y 296 0.5 0.5 0.5
0.22 0.78(3) Cu(1) 296 0 0 0
0.22 0.22(3) Al 296 0 0 0
0.22 -- Cu(2) 296 0 0 0.3587(2)
0.22 -- O(1) 296 0 0 0.155(1)
0.22 -- O(2) 296 0.5 0 0.3797(7)
0.22 0.21(3) O(3) 296 0 0.5 0
Measurement Method: X-ray diffraction
"The crystals were measured using a Nonius CAD-4 k-axis diffractometer with MoKα radiation, driven by the NRCCAD diffractomer package. Lattice parameters were determined by measuring absolute 2θ values of at least 25 reflections with 2θ > 50°, where Kα1 and Kα2 are separated. More than 600 reflections were collected for each crystal measured and corrected for absorption. Atomic positions were determined using the NRCVAX crystal structure program."

Cautions: Evaluated Data
The authors indicate the refined stoichiometry for this crystal to be YBa2Cu2.78Al0.22O6.4.
Critical Temperature for Y:123; [Y-Ba-Cu(Al)-O]
x of Alx (formula units) Critical Temperature (K)
0.000 92
0.100 74
0.112 82
0.127 51
0.131 45
0.136 42
0.161 20
0.210 0
Measurement Method: Dc magnetic susceptibility

Cautions: Unevaluated Data
No measurement details were noted. Digitized data were obtained from Figure 1 of the paper.