Material Specification for Y:123; [Y-Ba-Cu-O]
Process: Solid State Reaction
Notes: "A 15-g master batch... was prepared from predried 99.99% Y2O3, 99.999% CuO, and 99.9% BaCO3. The stoichiometric mixture of starting materials was ground thoroughly in air using an agate mortar and pestle, and fired at 940 °C for 1 day in air in an alumina crucible. Then 12 g was pressed into a (1.27 cm = 0.5 in) diameter pellet... samples were fired at 940 °C for 90 days in air with ten intermediate grindings, followed by heating in O2 at 640 °C for 1 day and oven cooling to room temperature."
Formula: YBa2Cu3O7
Informal Name: Y:123
Chemical Family: Y-Ba-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for Y:123; [Y-Ba-Cu-O]
| Crystal System: | Orthorhombic |
| Formula Units per Cell: | |
| Space Group: |
|
Cell Parameters
|
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 296 |
3.712(2) |
3.895(4) |
11.685(4) |
Measurement Method: X-ray diffraction
"From powder x-ray diffraction analysis, the batch... was single phase." No additional measurement details were noted.
Cautions: Unevaluated Data
Specific Heat for Y:123; [Y-Ba-Cu-O]
| Magnetic Field (T) |
Temperature (K) |
Specific Heat (J kg-1 K-1) |
| 7 |
0.3 |
0.003 |
| 7 |
1.5 |
0.02 |
| 7 |
1.9 |
0.04 |
| 7 |
3.2 |
0.07 |
| 7 |
4.3 |
0.11 |
| 7 |
5.6 |
0.20 |
| 7 |
7.5 |
0.40 |
| 7 |
9.0 |
0.69 |
| 0 |
0.2 |
0.002 |
| 0 |
2.1 |
0.04 |
| 0 |
2.6 |
0.05 |
| 0 |
3.2 |
0.07 |
| 0 |
3.9 |
0.09 |
| 0 |
5.7 |
0.20 |
| 0 |
7.5 |
0.40 |
| 0 |
8.9 |
0.68 |
Measurement Method: Pulse calorimetry
"Heat-capacity C(T) measurements were carried out on the pellet sample... using pulse calorimeters... at Berkeley (0.4-30 K, accuracy of... 0.3%)." No additional measurement details were noted.
Cautions: Evaluated Data
Digitized data were obtained from Figure 5 of the paper.
