Material Specification for Tl:1223; [Tl(Pb)-Sr-Ca-Cu-O]
Process: Solid State Reaction
Notes: "Single crystals of the 15.2 σ phase were grown from an oxide mixture in the molar ratio 1:1:2:3:4 (Tl:Pb:Sr:Ca:Cu) in a sealed gold tube. The mixture was heated to 910 °C for 6 h and cooled at 2 °C/min."
Formula: Tl0.5Pb0.5Sr2Ca1.9Cu3O9
Informal Name: Tl:1223
Chemical Family: Tl(Pb)-Sr-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Single Crystal
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Density (mass) for Tl:1223; [Tl(Pb)-Sr-Ca-Cu-O]
Measurement Method: X-ray diffraction
"Single-crystal x-ray diffraction data (were obtained as follows):
Sample dimensions (mm): 0.10 x 0.09 x 0.02,
Diffractometer Enraf-Nonius CAD4,
Radiation MoKα,
Monochromator Graphite,
2θ range 0 to 70 degrees
...The structure was refined by full-matrix least-squares analysis with neutral atom scattering factor curves and anomalous scattering terms and anisotropic thermal motion for the metal atoms."
Cautions: Evaluated Data
Crystallography for Tl:1223; [Tl(Pb)-Sr-Ca-Cu-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | 1 |
| Space Group: |
P4/mmm
|
Cell Parameters
|
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 296 |
3.808(1) |
-- |
15.232(7) |
Atomic Coordinates
| Atom |
Temp
K
|
a-axis |
b-axis |
c-axis |
| Tl/Pb |
296 |
0.067(3) |
0.00 |
0.00 |
| Sr |
296 |
0.50 |
0.50 |
0.1709(2) |
| Cu(1) |
296 |
0.00 |
0.00 |
0.50 |
| Cu(2) |
296 |
0.00 |
0.00 |
0.2868(2) |
| Ca |
296 |
0.50 |
0.50 |
0.3928(3) |
| O(1) |
296 |
0.00 |
0.50 |
0.50 |
| O(2) |
296 |
0.00 |
0.50 |
0.2924(7) |
| O(3) |
296 |
0.00 |
0.00 |
0.1311(11) |
| O(4) |
296 |
0.60(2) |
0.50 |
0.00 |
Measurement Method: X-ray diffraction
"Single-crystal x-ray diffraction data (were obtained as follows):
Sample dimensions (mm): 0.10 x 0.09 x 0.02,
Diffractometer Enraf-Nonius CAD4,
Radiation MoKα,
Monochromator Graphite,
2θ range 0 to 70 degrees
...The structure was refined by full-matrix least-squares analysis with neutral atom scattering factor curves and anomalous scattering terms and anisotropic thermal motion for the metal atoms."
Cautions: Evaluated Data
Critical Temperature for Tl:1223; [Tl(Pb)-Sr-Ca-Cu-O]
| Critical Temperature (K) |
| 118 |
Measurement Method: T
c measurement
"Flux-exclusion measurement on these crystals showed a sharp superconducting transition..." No additional measurement details were noted.
Cautions: Evaluated Data
