Material Specification for Tl:2223; [Tl-Ba-Ca-Cu-O]
Process: Solid State Reaction
Notes: "Various samples in the Tl/Ba/Ca/Cu/O system were prepared by thoroughly mixing Tl2O3, CaO2, BaO2, and CuO in various ratios. The mixtures were pressed into pellets, sealed in gold tubes (1.3 cm in diameter and 10 cm in length), and heated at 850°C to 925 °C for varying times. Under our preparatory conditions, essentially single-phase Tl2Ba2Ca2Cu3O10 was made by heating the mixture containing stoichiometric quantities to 890 °C for 1 h... Single crystals of Tl2Ba2Ca2Cu3O10 were grown from starting compositions containing excess Ca and Cu (2Tl:2Ba:3Ca:4Cu) in sealed gold tubes. Reaction mixtures were heated to 920 °C for 3 h and cooled to 300 °C at a rate of 5 °C/min."
Formula: Tl2Ba2Ca2Cu3O10
Informal Name: Tl:2223
Chemical Family: Tl-Ba-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:2223; [Tl-Ba-Ca-Cu-O]
Measurement Method: X-ray diffraction
"The structure... has been determined from single-crystal x-ray diffraction data."
Diffractomer: Enraf-Nonius CAD4
Radiation: MoKα
Monochromator: Graphite
2θ range: 0° - 60°
Cautions: Evaluated Data
Crystallography for Tl:2223; [Tl-Ba-Ca-Cu-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | 2 |
| Space Group: |
I4/mmm
|
Cell Parameters
|
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 296 |
3.8503(6) |
-- |
35.88(3) |
Atomic Coordinates
| Atom |
Temp
K
|
a-axis |
b-axis |
c-axis |
| Tl(1) |
296 |
0.50 |
0.50 |
0.2201(1) |
| Ba(1) |
296 |
0.00 |
0.00 |
0.1448(1) |
| Cu(1) |
296 |
0.50 |
0.50 |
0.00 |
| Cu(2) |
296 |
0.50 |
0.50 |
0.0896(2) |
| Ca(1) |
296 |
0.00 |
0.00 |
0.0463(2) |
| O(1) |
296 |
0.50 |
0.00 |
0.00 |
| O(2) |
296 |
0.50 |
0.00 |
0.0875(6) |
| O(3) |
296 |
0.50 |
0.50 |
0.1588(13) |
| O(4) |
296 |
0.50 |
0.50 |
0.2719(14) |
Measurement Method: X-ray diffraction
"The structure... has been determined from single-crystal x-ray diffraction data."
Diffractomer: Enraf-Nonius CAD4
Radiation: MoKα
Monochromator: Graphite
2θ range: 0° - 60°
Cautions: Evaluated Data
Critical Temperature for Tl:2223; [Tl-Ba-Ca-Cu-O]
| Critical Temperature (K) |
| 122 |
Measurement Method: Four-probe method
"Four-probe resistivity measurements on a typical sample showed apparent zero resistivity (10
-8 ohms) at 122 K." No additional measurement details were noted.
Cautions: Evaluated Data
