Material Specification for Tl:2223; [Tl-Ba-Ca-Cu-O]
Process: Solid State Reaction
Notes: The authors cite Z.Z. Sheng et al., Nature, Vol. 332, 138 (1988), and summarize the procedure as follows. "The samples were prepared... from Ba2Cu3O5 and oxides of thallium and calcium. The powders were mixed, ground, pressed into pellets, and then heated to about 900 °C in flowing oxygen for 3 min. The sample was furnace cooled by turning off the furnace for 1 h and then removed."
Formula: Tl2.2Ba2.14Ca2Cu3.72Ox
Informal Name: Tl:2223
Chemical Family: Tl-Ba-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Critical Temperature for Tl:2223; [Tl-Ba-Ca-Cu-O]
| Tc (onset) (K) |
Critical Temperature (K) |
| 120 |
104 |
Measurement Method: Four-probe method
"Resistance was measured by the standard four-probe technique using silver-paste contacts." No additional measurement details were noted.
Cautions: Evaluated Data
Thermoelectric Power for Tl:2223; [Tl-Ba-Ca-Cu-O]
| Temperature (K) |
Thermoelectric Power (µV/K) |
| 102 |
0.0 |
| 111 |
0.0 |
| 113 |
0.5 |
| 115 |
2.2 |
| 119 |
5.8 |
| 123 |
7.2 |
| 132 |
8.0 |
| 135 |
7.9 |
| 155 |
8.7 |
| 160 |
8.7 |
| 164 |
9.1 |
| 167 |
9.3 |
| 211 |
7.5 |
| 243 |
6.5 |
| 246 |
6.5 |
| 258 |
6.0 |
| 264 |
5.6 |
| 271 |
5.4 |
| 276 |
5.4 |
| 280 |
5.1 |
| 294 |
4.8 |
| 299 |
4.5 |
Measurement Method: Thermopower measurement
The authors cite N. Mitra et al., Phys. Rev. B, Vol. 26, 5581 (1987), and summarize the procedure as follows. "A differential method was employed in which a voltage difference is measured across the sample in response to an imposed temperature difference. Two sets of reference leads (Constantan and Chromel) were used and the voltages, after correcting for the thermoelectric power of the leads, were averaged to obtain the final results. The measurements were made in vacuum as the sample slowly warmed from liquid-nitrogen temperature to ambient."
Cautions: Evaluated Data
Digitized data were obtained from Figure 1a of the paper.
