Material Specification for Sm:123; [Sm(Pr)-Ba-Cu-O]
Process: Solid State Reaction
Notes: "The samples were prepared by a standard powder-synthesis technique from the appropriate amounts of CuO, Y2O3, Sm2O3, Nd2O3, Pr6O11, CaCO3, and BaCO3. .... After careful mixing, the powders were compacted to cylindrical tablets and subjected to a first heat treatment, crushed, reground, and sintered a second time. Finally the samples were annealed in oxygen... Sample preparation conditions:
First heat treatment: air, 910 °C, 24 h
Second heat treatment: air, 910 °C, 24 h
Third heat treatment: oxygen, 450 °C, 48 h."
Formula: Sm1-xPrxBa2Cu3O7-y
Informal Name: Sm:123
Chemical Family: Sm(Pr)-Ba-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Critical Flux Density Hc2 for Sm:123; [Sm(Pr)-Ba-Cu-O]
| x of Prx (formula units) |
Temperature (K) |
Crit.Mag.Flux Density Hc2 (T) |
| 0.0 |
88 |
11.8 |
| 0.0 |
89 |
7.8 |
| 0.0 |
91 |
3.8 |
| 0.0 |
93 |
1.4 |
| 0.0 |
94 |
0 |
| 0.10 |
69 |
11.9 |
| 0.10 |
72 |
7.9 |
| 0.10 |
75 |
3.9 |
| 0.10 |
77 |
1.5 |
| 0.10 |
79 |
0 |
| 0.20 |
42 |
11.9 |
| 0.20 |
45 |
7.8 |
| 0.20 |
50 |
4.0 |
| 0.20 |
53 |
1.4 |
| 0.20 |
57 |
0 |
| 0.30 |
15 |
11.9 |
| 0.30 |
20 |
7.9 |
| 0.30 |
27 |
3.9 |
| 0.30 |
31 |
1.5 |
| 0.30 |
36 |
0 |
Measurement Method: Electrical resistance
"The cylindrical samples were cut into thin rectangular ribbons. Typical dimensions were 0.7 x 2 x 10 mm
3. Four grooves were cut with a razor blade on the surface of a sample, into which thin copper wires for voltage and current leads were attached with silver paint. This arrangement gave satisfactorily low contact resistances of order 1 Ω. Magnetic fields up to 12 T were provided by a superconducting magnet. Platinum resistors were used as thermometers... Measuring currents were small, corresponding to current densities of order 0.1 A/cm
2... we use resistive midpoints for the definitions of critical temperature and critical magnetic field H
."
Cautions: Evaluated Data
Digitized data were obtained from Figure 7 of the paper.
