Material Specification for Tl:2212; [Tl-Ba-Ca-Cu-O]
Process: Solid State Reaction
Notes: The authors cite Y. Shimakawa et al., Phys. Rev. B, Vol. 40, 11400 (1989), and summarize the procedure as follows. "The polycrystalline samples of Tl2Ba2CuO6 and Tl2Ba2CaCu2O8 having various superconducting transition temperatures were prepared by solid state reactions." No additional processing details were noted.
Formula: Tl2Ba2CaCu2O8
Informal Name: Tl:2212
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:2212; [Tl-Ba-Ca-Cu-O]
| dTc/dP (K/GPa) |
Pressure (GPa) |
Critical Temperature (K) |
| --- |
0.0 |
117.1 |
| --- |
1.0 |
118.5 |
| --- |
1.6 |
119.0 |
| --- |
1.9 |
119.1 |
| --- |
2.0 |
119.2 |
| --- |
2.7 |
119.3 |
| --- |
3.4 |
118.7 |
| --- |
4.2 |
118.2 |
| --- |
4.8 |
117.5 |
| --- |
6.0 |
115.5 |
| --- |
7.0 |
113.1 |
| --- |
8.0 |
111.1 |
| 1.7 |
0.0 |
117.0 |
| -2.3 |
0.0 |
111.0 |
Measurement Method: Four-probe resistance
"The temperature dependence of the electrical resistivity under pressure was measured with a dc four-lead method using a high-pressure cryostat. A piston-cylinder device (below 2 GPa) and a cubic anvil device (up to 8 GPa) were used to generate and retain nearly hydrostatic pressure in a Teflon cell filled with a fluid pressure medium, a mixture of Fluorinert No. FC70 and No. FC77. The force applied to the piston was changed only at room temperature and was kept constant during the measurements upon cooling and heating. The pressure was determined by using the Bi I-II and III'-V phase transition points of 2.55 GPa and 7.7 GPa, respectively, at room temperature. The pressure below room temperature was measured with a calibrated Pt(Co) resistance thermometer placed near the sample."
Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
Material Specification for Tl:221; [Tl-Ba-Cu-O]
Process: Solid State Reaction
Notes: The authors cite Y. Shimakawa et al., Phys. Rev. B, Vol. 40, 11400 (1989), and summarize the procedure as follows. "The polycrystalline samples of Tl2Ba2CuO6 and Tl2Ba2CaCu2O8 having various superconducting transition temperatures were prepared by solid state reactions." No additional processing details were noted.
Formula: Tl2Ba2CuO6+x
Informal Name: Tl:221
Chemical Family: Tl-Ba-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:221; [Tl-Ba-Cu-O]
| dTc/dP (K/GPa) |
Pressure (GPa) |
Critical Temperature (K) |
| -0.88 |
0 |
87 |
| -1.3 |
0 |
82 |
| -3.2 |
0 |
61 |
| -5.9 |
0 |
51 |
| -6.0 |
0 |
49 |
| -3.3 |
0 |
20 |
| -2.8 |
0 |
16 |
Measurement Method: Four-probe resistance
"The temperature dependence of the electrical resistivity under pressure was measured with a dc four-lead method using a high-pressure cryostat. A piston-cylinder device (below 2 GPa) and a cubic anvil device (up to 8 GPa) were used to generate and retain nearly hydrostatic pressure in a Teflon cell filled with a fluid pressure medium, a mixture of Fluorinert No. FC70 and No. FC77. The force applied to the piston was changed only at room temperature and was kept constant during the measurements upon cooling and heating. The pressure was determined by using the Bi I-II and III'-V phase transition points of 2.55 GPa and 7.7 GPa, respectively, at room temperature. The pressure below room temperature was measured with a calibrated Pt(Co) resistance thermometer placed near the sample."
Cautions: Evaluated Data
