Material Specification for Tl:1223; [Tl(Pb)-Sr-Ca-Cu-O]
Process: Solid State Reaction
Notes: The authors cite M.A.G. Aranda et al., Physica C, Vol. 221, 304 (1994), and summarize the procedure as follows. "The sample was prepared from high-purity powders of Tl2O3, PbO2, SrO2, CaO, and CuO to give the composition Tl0.5Pb0.5Sr2Ca2Cu3O9. The CaO and CuO were dried prior to use. Six charges of about 0.7 g each, were individually mixed into a paste with acetone and then pressed into pellets. The pellets were wrapped in gold foil envelopes to reduce the loss of thallium and lead at elevated temperatures, then sintered in a preheated furnace at 950 °C for 7 h in a flowing oxygen atmosphere. After sintering, the furnace was cooled to room temperature at a rate of 5 °C/min."
Formula: Tl0.5Pb0.5Sr1.6Ca2.4Cu3O9
Informal Name: Tl:1223
Chemical Family: Tl(Pb)-Sr-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for Tl:1223; [Tl(Pb)-Sr-Ca-Cu-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | |
| Space Group: |
|
Cell Parameters
|
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 85 |
3.81398 |
-- |
15.2558 |
| 100 |
3.81414 |
-- |
15.2582 |
| 110 |
3.81427 |
-- |
15.2599 |
| 125 |
3.81454 |
-- |
15.2615 |
| 150 |
3.81502 |
-- |
15.2662 |
Measurement Method: Diffraction methods
"Four resonant powder X-ray diffraction patterns were collected using diffractometer 2.3 at the SERC Synchrotron Radiation Source, Daresbury, at the Cu K, Tl L
, Pb L
and Sr K edges. Neutron diffraction patterns of the same sample were recorded at five temperatures between 80 K and 100 K on the POLARIS diffractometer at ISIS, Rutherford Appleton Laboratory, Didcot. ... The elemental contrast gained through the large anomalous dispersion effects enabled the occupation factors of Tl, Pb, Sr, Ca, and Cu to be refined independently at each site without correlations between the values for different sites. ... Rietveld fits to neutron data... (were used to determine) the cell parameters."
Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
Critical Temperature for Tl:1223; [Tl(Pb)-Sr-Ca-Cu-O]
| Transition Width (K) |
Critical Temperature (K) |
| 1 |
118 |
Measurement Method: Resistivity method
No measurement details were noted.
Cautions: Unevaluated Data
Resistivity (normal state) for Tl:1223; [Tl(Pb)-Sr-Ca-Cu-O]
| Temperature (K) |
Resistivity (normal state) (mΩ·cm) |
| 95 |
0.00 |
| 118 |
0.00 |
| 119 |
0.22 |
| 119 |
0.34 |
| 119 |
0.57 |
| 123 |
0.62 |
| 127 |
0.69 |
| 137 |
0.77 |
| 150 |
0.86 |
| 158 |
0.93 |
| 177 |
1.05 |
| 194 |
1.17 |
| 213 |
1.29 |
| 227 |
1.39 |
| 242 |
1.51 |
| 258 |
1.61 |
| 276 |
1.73 |
| 299 |
1.87 |
Measurement Method: Resistivity method
No measurement details were noted.
Cautions: Unevaluated Data
Digitized data were obtained from Figure 1 of the paper.
