Material Specification for Y:123; [Y(Pr)-Ba-Cu-O]
Process: Solid State Reaction
Notes: "The specimens... were prepared by solid-state reaction of the appropriate amounts of high purity (99.99% or better) Y2O3, Pr6O11BaCO3, and CuO. All of the oxides were dried overnight at 800 °C prior to use. The powders were weighed, ground in an agate mortar, placed as a powder in an Al2O3 crucible, and fired in air at 900 °C for 2 days. The resultant powder was then reground and fired for 2-3 days four times with intermediate grindings. Subsequently, the powder was pressed into pellets which were fired in oxygen for four days at 980 °C and then slow cooled at 1 °C/min to 540 °C, where they remained overnight before a final slow cool at 1 °C/min to room temperature. All specimens were annealed together in an atmosphere of flowing oxygen. Oxygen contents were determined by iodometric titration to be 6.95±0.02."
Formula: Y1-xPrxBa2Cu3O7-y
Informal Name: Y:123
Chemical Family: Y(Pr)-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 Y:123; [Y(Pr)-Ba-Cu-O]
| x of Prx (formula units) |
ΔTc (K) |
Critical Temperature (K) |
| 0 |
0.7 |
92.2 |
| 0.2 |
2.7 |
73.3 |
| 0.3 |
3.9 |
62.5 |
| 0.4 |
2.8 |
45.3 |
| 0.6 |
9.6 |
9.0 |
Measurement Method: Electrical resistance
"Low-frequency (... 16 Hz) ac electrical resistivity measurements on the... specimens revealed that they exhibit metallic behavior (positive resistivity versus T slopes) in the concentration range 0 ≤x ≤0.6 as well as superconductivity. The values of the superconducting transition temperature T
c-T
c(0.5) and the transition width ΔT
c-T
c(0.9)-T
c(0.1), where T
c(0.n) is the temperature at which the resistivity drops to 0.n of its extrapolated normal-state value, (were determined)." No additional measurement details were noted.
Cautions: Evaluated Data
Specific Heat for Y:123; [Y(Pr)-Ba-Cu-O]
| x of Prx (formula units) |
Temperature (K) |
Specific Heat (J kg-1 K-1) |
| 0.0 |
0.6 |
0.01 |
| 0.0 |
4.6 |
0.04 |
| 0.0 |
8.4 |
0.3 |
| 0.0 |
14.5 |
2.1 |
| 0.0 |
22.7 |
11.0 |
| 0.0 |
24.4 |
13.4 |
| 0.2 |
0.6 |
0.01 |
| 0.2 |
4.0 |
0.2 |
| 0.2 |
7.7 |
0.9 |
| 0.2 |
12.8 |
2.3 |
| 0.2 |
17.8 |
5.7 |
| 0.2 |
21.5 |
10.0 |
| 0.2 |
24.0 |
13.8 |
| 0.4 |
0.6 |
0.4 |
| 0.4 |
4.6 |
1.2 |
| 0.4 |
9.3 |
2.0 |
| 0.4 |
15.6 |
4.8 |
| 0.4 |
19.9 |
8.9 |
| 0.4 |
23.0 |
13.6 |
| 0.4 |
24.0 |
15.2 |
| 0.6 |
0.6 |
0.4 |
| 0.6 |
4.9 |
2.0 |
| 0.6 |
7.4 |
2.7 |
| 0.6 |
12.5 |
4.7 |
| 0.6 |
17.8 |
7.8 |
| 0.6 |
21.1 |
11.7 |
| 0.6 |
24.4 |
16.8 |
Measurement Method: Calorimeter
"Specific heat measurements were performed... using a
3He semiadiabatic calorimeter with the heat-pulse technique." No additional measurement details were noted.
Cautions: Evaluated Data
Digitized data were obtained from Figure 1 of the paper.
