Material Specification for Tl:1212; [Tl(Pb)-Sr(La)-Ca-Cu-O]
Process: Solid State Reaction
Notes: "Samples... were prepared by making stoichiometric mixes of oven-dried Ca(NO3)2, Sr(NO3)2, Y2O3, and CuO as appropriate and decomposing the nitrates at 700 °C for 1 h, adding stoichiometric quantities of Tl2O3 and PbO, milling the mixture thoroughly and die-pressing 10 mm diam pellets. These were sealed under an oxygen atmosphere into gold bags, together with small amounts of AgO powder which provide excess oxygen during the reaction. Materials were reacted for 3 h at 950 °C and then quenched to room temperature. Subsequent annealing of the pellets at 700 °C for 1 h in (0.1 MPa = 1 bar) O2 frequently sharpened the superconducting transition."
Formula: Tl0.5Pb0.5Sr2-xLaxCaCu2O7+y
Informal Name: Tl:1212
Chemical Family: Tl(Pb)-Sr(La)-Ca-Cu-O
Chemical Class: Oxide
Structure Type:
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for Tl:1212; [Tl(Pb)-Sr(La)-Ca-Cu-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | |
| Space Group: |
P4/mmm
|
Cell Parameters
| x (formula units) |
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 0.0 |
296 |
3.798 |
-- |
12.106 |
| 0.1 |
296 |
3.800 |
-- |
12.093 |
| 0.2 |
296 |
3.809 |
-- |
12.092 |
| 0.3 |
296 |
3.810 |
-- |
12.085 |
| 0.4 |
296 |
3.814 |
-- |
12.072 |
| 0.5 |
296 |
3.822 |
-- |
12.058 |
| 0.6 |
296 |
3.825 |
-- |
12.045 |
| 0.7 |
296 |
3.825 |
-- |
12.014 |
| 0.8 |
296 |
3.832 |
-- |
11.958 |
| 0.9 |
296 |
3.837 |
-- |
11.933 |
| 1.0 |
296 |
3.838 |
-- |
11.926 |
Measurement Method: X-ray diffraction
"X-ray powder diffraction patterns were collected using CoKα radiation." No additional measurement details were noted.
Cautions: Evaluated Data
Digitized data were obtained from Figure 2a of the paper.
Critical Temperature for Tl:1212; [Tl(Pb)-Sr(La)-Ca-Cu-O]
| x (formula units) |
Critical Temperature (K) |
| 0.0 |
88 |
| 0.1 |
100 |
| 0.13 |
107 |
| 0.2 |
105 |
| 0.24 |
105 |
| 0.3 |
105 |
| 0.4 |
95 |
| 0.5 |
98 |
| 0.6 |
83 |
| 0.7 |
61 |
| 0.8 |
34 |
| 0.9 |
17 |
| 1.0 |
10 |
Measurement Method: Four-probe method
"... resistive... transitions to the superconducting state were recorded... from 4-point resistance measurements." No additional measurement details were noted.
Cautions: Evaluated Data
Digitized data were obtained from Figure 2a of the paper.
Material Specification for Tl:1212; [Tl(Pb)-Sr-Ca(Y)-Cu-O]
Process: Solid State Reaction
Notes: "Samples... were prepared by making stoichiometric mixes of oven-dried Ca(NO3)2, Sr(NO3)2, Y2O3, and CuO as appropriate and decomposing the nitrates at 700 °C for 1 h, adding stoichiometric quantities of Tl2O3 and PbO, milling the mixture thoroughly and die-pressing 10 mm diam pellets. These were sealed under an oxygen atmosphere into gold bags, together with small amounts of AgO powder which provide excess oxygen during the reaction. Materials were reacted for 3 h at 950 °C and then quenched to room temperature. Subsequent annealing of the pellets at 700 °C for 1 h in (0.1 MPa = 1 bar) O2 frequently sharpened the superconducting transition."
Formula: Tl0.5Pb0.5Sr2Ca1-xYxCu2O7+y
Informal Name: Tl:1212
Chemical Family: Tl(Pb)-Sr-Ca(Y)-Cu-O
Chemical Class: Oxide
Structure Type:
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for Tl:1212; [Tl(Pb)-Sr-Ca(Y)-Cu-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | |
| Space Group: |
P4/mmm
|
Cell Parameters
| x (formula units) |
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 0.0 |
296 |
3.798 |
-- |
12.106 |
| 0.1 |
296 |
3.800 |
-- |
12.088 |
| 0.2 |
296 |
3.807 |
-- |
12.058 |
| 0.4 |
296 |
3.809 |
-- |
12.033 |
| 0.5 |
296 |
3.811 |
-- |
11.997 |
| 0.6 |
296 |
3.815 |
-- |
11.961 |
Measurement Method: X-ray diffraction
"X-ray powder diffraction patterns were collected using CoKα radiation." No additional measurement details were noted.
Cautions: Evaluated Data
Digitized data were obtained from Figure 2b of the paper.
Critical Temperature for Tl:1212; [Tl(Pb)-Sr-Ca(Y)-Cu-O]
| x (formula units) |
Critical Temperature (K) |
| 0.0 |
88 |
| 0.1 |
95 |
| 0.2 |
102 |
| 0.4 |
80 |
| 0.5 |
70 |
| 0.6 |
30 |
Measurement Method: Four-probe method
"... resistive... transitions to the superconducting state were recorded... from 4-point resistance measurements." No additional measurement details were noted.
Cautions: Evaluated Data
Digitized data were obtained from Figure 2b of the paper.
