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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: Mossbauer Study of Fe Site Occupancy and its Effect on Tc in YBa2(Cu1-xFex)3O6+y as a Function of Thermal Treatments
Author(s): M.G. Smith, R.D. Taylor, and H. Oesterreicher
Publication: Physical Review B Volume: 42 Issue: 7 Year: 1990 Page(s): 4202-4207
Editor(s): Not Available
Publisher: American Physical Society
Language: English
Notes: Not Available
Keywords: Material Specification, Crystallography, Critical Temperature, Magnetic Susceptibility

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 materials... were prepared by the solid-state reaction method. Stoichiometric amounts of dried CuO, Fe2O3, Y2O3, and BaCO3 were ground with a mortar and pestle and pressed into a pellet... The initial, conventional (method I) treatment... consisted of sintering in air at 925 °C for 21 h. This process was repeated three more times with intermediate grindings and pressings. The material was then annealed at 850 °C in flowing O2 for 2 h with slow cooling to 100 °C over 10 h... The second method (II)... involved subsequently annealing the sample in flowing N2 at 770 °C for 48 h and quick quenching to room temperature. This was followed by annealing in flowing O2 at 350 °C for 1 h with slow cooling to room temperature (3 h)."
Formula: YBa2Cu3-xFexO7-y
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
Processing Method () x of Fex (formula units) Temp K a Å b Å c Å
I 0.18 296 3.868 -- 11.69
I 0.30 296 3.865 -- 11.67
II 0.18 296 3.845 3.886 11.67
II 0.30 296 3.850 3.882 11.67
Measurement Method: X-ray diffraction
"X-ray diffraction was performed with CuKα radiation. Typical errors in reported lattice parameters are 0.007-0.010 σ... Conventional synthesis (method I) results in tetragonal structures, whereas treatment in N2 at 770 °C followed by a relatively short anneal (1 h) at 350 °C in O2 results in orthorhombic structures." No additional measurement details were noted.

Cautions: Evaluated Data
Critical Temperature for Y:123; [Y-Ba-Cu(Fe)-O]
Processing Method () x of Fex (formula units) Critical Temperature (K)
I 0.18 69 ± 1
I 0.30 55 ± 1
II 0.18 81 ± 1
II 0.30 63 ± 1
Measurement Method: SQUID magnetometer
"Magnetic susceptibility was performed using a superconducting quantum interference device (SQUID) magnetometer in a field of (10 mT = 100 G)." No additional measurement details were noted.

Cautions: Evaluated Data
Magnetic Susceptibility for Y:123; [Y-Ba-Cu(Fe)-O]
Processing Method () x of Fex (formula units) Temperature (K) Magnetic Susceptibility (arbitrary)
I 0.18 10 -1.11
I 0.18 20 -1.03
I 0.18 30 -0.71
I 0.18 41 -0.49
I 0.18 51 -0.21
I 0.18 57 -0.04
I 0.18 65 0.00
I 0.18 100 0.00
I 0.30 20 -0.32
I 0.30 30 -0.17
I 0.30 35 -0.06
I 0.30 45 0.00
I 0.30 100 0.00
II 0.18 7 -1.48
II 0.18 11 -1.46
II 0.18 20 -1.33
II 0.18 30 -1.16
II 0.18 41 -0.90
II 0.18 51 -0.51
II 0.18 60 -0.13
II 0.18 80 0.00
II 0.18 100 0.00
II 0.30 6 -0.41
II 0.30 10 -0.36
II 0.30 21 -0.17
II 0.30 30 -0.06
II 0.30 41 0.00
II 0.30 100 0.00
Measurement Method: SQUID magnetometer
"Magnetic susceptibility was performed using a superconducting quantum interference device (SQUID) magnetometer in a field of (10 mT = 100 G)." No additional measurement details were noted.

Cautions: Evaluated Data
Digitized data were obtained from Figure 1 of the paper.