Material Specification for TlSr:1412; [Tl(Pb)-Sr-C-Cu-O]
Process: Solid State Reaction
Notes: "The samples were prepared from a mixture of oxides Tl2O3, PbO2, SrO2, CuO, Sr2CuO3, and carbonate SrCO3. The amounts of reactants were chosen in order to have the nominal composition... The powders were mixed in an agate mortar, pressed into bars, put in an alumina crucible and sealed in an evacuated quartz ampoule. The ampoules were then introduced in a hot furnace at 900 °C, held for six hours, and quenched down to room temperature."
Formula: Tl0.5Pb0.5Sr4CCu2O10
Informal Name: TlSr:1412
Chemical Family: Tl(Pb)-Sr-C-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for TlSr:1412; [Tl(Pb)-Sr-C-Cu-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | |
| Space Group: |
P4/mmm
|
Cell Parameters
|
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 296 |
3.8244(1) |
-- |
16.516(1) |
Atomic Coordinates
| Atom |
Temp
K
|
a-axis |
b-axis |
c-axis |
| Tl/Pb |
296 |
0.083(2) |
0 |
0 |
| Sr(1) |
296 |
0.5 |
0.5 |
0.1596(2) |
| Sr(2) |
296 |
0.5 |
0.5 |
0.3725(2) |
| Cu |
296 |
0 |
0 |
0.2654(3) |
| C |
296 |
0 |
0 |
0.5 |
| O(1) |
296 |
0.670(10) |
0.5 |
0 |
| O(2) |
296 |
0 |
0 |
0.121(1) |
| O(3) |
296 |
0.162(7) |
0 |
0.414(2) |
| O(4) |
296 |
0.316(12) |
0 |
0.5 |
| O(5) |
296 |
0.5 |
0 |
0.277(1) |
Measurement Method: X-ray diffraction
"The powder X-ray diffraction patterns were registered by step scanning over an angular range of 13° ≤2θ ≤80° with an increment of 0.02° (2θ) by means of a Philips diffractometer using CuKα radiation. The profile refinement computer program DBW 3.2 was used to refine the cell parameters and the crystal structure."
Cautions: Evaluated Data
Critical Temperature for TlSr:1412; [Tl(Pb)-Sr-C-Cu-O]
| Annealing Time (min) |
Critical Temperature (K) |
| 0 |
20 |
| 15 |
60 |
Measurement Method: Ac susceptibility
"The superconducting properties were studied, on sintered materials, as a function of temperature down to 4.2 K, using an AC Lakeshore susceptometer with an applied field of (0.5 mT = 5 G). No demagnetization correction were made."
Cautions: Evaluated Data
Magnetic Susceptibility for TlSr:1412; [Tl(Pb)-Sr-C-Cu-O]
| Annealing Time (min) |
Temperature (K) |
Magnetic Susceptibility (arbitrary) |
| 0 |
7 |
-0.43 |
| 0 |
11 |
-0.40 |
| 0 |
15 |
-0.30 |
| 0 |
18 |
-0.15 |
| 0 |
20 |
-0.06 |
| 0 |
23 |
0.00 |
| 15 |
21 |
-0.47 |
| 15 |
35 |
-0.44 |
| 15 |
47 |
-0.37 |
| 15 |
53 |
-0.25 |
| 15 |
58 |
-0.10 |
| 15 |
60 |
-0.02 |
| 15 |
62 |
-0.01 |
| 15 |
64 |
0.00 |
Measurement Method: Ac susceptibility
"The superconducting properties were studied, on sintered materials, as a function of temperature down to 4.2 K, using an AC Lakeshore susceptometer with an applied field of (0.5 mT = 5 G). No demagnetization correction were made."
Cautions: Evaluated Data
Digitized data were obtained from Figure 7 of the paper.
