Material Specification for Y:123; [Y(Ca)-Ba-Cu(Al)-O]
Process: Solid State Reaction
Notes: "A series of sintered samples... were prepared by mixing Y2O3, Al2O3, BaCO3, CaCO3, and CuO powders in stoichiometric proportion and firing in air at 920 °C for 24 h. The powders were reground and reheated at 925 °C for 24 h. This processing was repeated 3 times with the firing temperature successively raised by 5 °C each time. Finally, the powders were pressed into pellets, annealed in flowing oxygen at 945 °C for 48 h, and cooled to room temperature at the rate of 25 °C/h."
Formula: Y1-xCaxBa2Cu3-xAlxO7-y
Informal Name: Y:123
Chemical Family: Y(Ca)-Ba-Cu(Al)-O
Chemical Class: Oxide
Structure Type:
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for Y:123; [Y(Ca)-Ba-Cu(Al)-O]
| Crystal System: | |
| Formula Units per Cell: | |
| Space Group: |
|
Cell Parameters
| x (formula units) |
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 0.000 |
296 |
3.822 |
3.895 |
11.678 |
| 0.025 |
296 |
3.826 |
3.889 |
11.667 |
| 0.050 |
296 |
3.837 |
3.885 |
11.654 |
| 0.100 |
296 |
3.860 |
3.875 |
11.622 |
| 0.150 |
296 |
3.869 |
-- |
11.631 |
| 0.200 |
296 |
3.869 |
-- |
11.629 |
| 0.250 |
296 |
3.865 |
-- |
11.624 |
Measurement Method: X-ray diffraction
"X-ray powder diffraction patterns were obtained with a Siemens Diffractometer D5000 using CuKα radiation."
Cautions: Evaluated Data
Critical Temperature for Y:123; [Y(Ca)-Ba-Cu(Al)-O]
| x (formula units) |
Critical Temperature (K) |
| 0.00 |
93.1 |
| 0.02 |
94.5 |
| 0.05 |
92.1 |
| 0.10 |
91.2 |
| 0.15 |
90.6 |
| 0.25 |
88.0 |
Measurement Method: Ac magnetic susceptibility
"The AC magnetic susceptibility measurement was used to determine the superconducting critical temperature of the samples. The temperature corresponding to the half value of the maximum transition signal was defined as the T
c."
Cautions: Evaluated Data
Digitized data were obtained from Figure 3 of the paper.
