Material Specification for Tl:2223; [Tl-Ba-Ca-Cu-O]
Process: Solid State Reaction
Notes: The authors cites P.T. Wu et al., Physica C, Vol. 156, 109 (1988), and summarize the procedure as follows. "Commercially available CaCO3 (99.999%), BaCO3 (99.99%), and CuO (99.999%) powders were mixed and ground in an alumina mortar. The mixture was then reacted in an alumina crucible in air at 925 °C, ground to a powder, and the process repeated once more... The Tl2O3 (99.995%) was then added to the precursor, the mixture reground and pressed into a pellet... The final composite is formed by reacting the pellet inside a covered platinum crucible placed in a furnace with flowing oxygen and held at 895 °C for about 5 min."
Formula: Tl2Ba2Ca2Cu3O10
Informal Name: Tl:2223
Chemical Family: Tl-Ba-Ca-Cu-O
Chemical Class: Oxide
Structure Type:
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Thermal Conductivity for Tl:2223; [Tl-Ba-Ca-Cu-O]
| Sample # () |
Temperature (K) |
Thermal Conductivity (W m-1 K-1) |
| 1 |
27 |
1.4 |
| 1 |
30 |
1.7 |
| 1 |
41 |
2.2 |
| 1 |
50 |
2.5 |
| 1 |
63 |
3.0 |
| 1 |
63 |
3.0 |
| 1 |
71 |
3.2 |
| 1 |
84 |
3.2 |
| 1 |
105 |
2.9 |
| 1 |
131 |
2.7 |
| 1 |
163 |
2.7 |
| 1 |
189 |
2.7 |
| 1 |
229 |
2.9 |
| 1 |
245 |
2.9 |
| 2 |
27 |
1.2 |
| 2 |
30 |
1.5 |
| 2 |
38 |
1.9 |
| 2 |
55 |
2.5 |
| 2 |
73 |
2.8 |
| 2 |
108 |
2.7 |
| 2 |
126 |
2.6 |
| 2 |
150 |
2.6 |
| 2 |
174 |
2.9 |
Measurement Method: Steady-state method
"Measurements... were carried out in a
4He cryostat down to 2 K and extended to subkelvin temperatures in a dilution refrigerator. Samples were of sufficiently large size to allow the use of the classical steady-state method of measurement. Above 4 K we employed a pair of calibrated glassy carbon thermometers together with a differential thermocouple made from Au+0.07 at.% Fe/chromel P wires. At very low temperatures we used a pair of calibrated germanium resistance sensors."
Cautions: Evaluated Data
The authors note "Differences in the magnitude of the thermal conductivity... are undoubtedly associated with varying defect structures associated with sintered samples..." Digitized data were obtained from Figure 1 of the paper.
