Material Specification for Y:123; [Y(Ca,Pr)-Ba-Cu-O]
Process: Solid State Reaction
Notes: "Samples... were prepared from the appropriate amounts of CuO, Y2O3, Pr6O11, CaCO3, and BaCO3 which were carefully mixed. The true oxide content of the starting materials was determined by thermogravimetric analyses. The mixtures were pressed into tablets and heat treated at 920 °C for 24 h, reground and sintered at 950 °C for 48 h in air. The samples were then saturated with oxygen by heat treatment at 450 °C for 48 h in oxygen."
Formula: Y1-y-zCayPrzBazCu3O7-x
Informal Name: Y:123
Chemical Family: Y(Ca,Pr)-Ba-Cu-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,Pr)-Ba-Cu-O]
| Crystal System: | Orthorhombic |
| Formula Units per Cell: | |
| Space Group: |
|
Cell Parameters
| y of Cay (formula units) |
z of Prz (formula units) |
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 0 |
0 |
296 |
3.8182(2) |
3.8845(2) |
11.6818(8) |
| 0.1 |
0.1 |
296 |
3.8233(3) |
3.8873(2) |
11.679(1) |
| 0.2 |
0.2 |
296 |
3.8285(4) |
3.8877(8) |
11.679(1) |
| 0.25 |
0.32 |
296 |
3.8315(4) |
3.8899(4) |
11.681(1) |
| 0.25 |
0.5 |
296 |
3.8341(3) |
3.8963(4) |
11.680(1) |
Measurement Method: X-ray diffraction
"The prepared samples were characterized by their X-ray powder photographs obtained in a Guinier-Hagg focussing camera using CuKα radiation and Si as an internal standard. The evaluation of the photographs (was) performed with the use of a film microdensitometer system. The amount of impurity phase, i.e. BaCuO
2, was estimated from determination of intensity ratios of the strongest reflections of the 1:2:3 phase and of the impurity phase."
Cautions: Evaluated Data
Critical Temperature for Y:123; [Y(Ca,Pr)-Ba-Cu-O]
| y of Cay (formula units) |
z of Prz (formula units) |
Critical Temperature (K) |
| 0 |
0 |
91.4 |
| 0.1 |
0.1 |
81.2 |
| 0.2 |
0.2 |
71.8 |
| 0.25 |
0.32 |
62.3 |
| 0.25 |
0.5 |
47.7 |
Measurement Method: Electrical resistance method
"T
c and the upper critical magnetic field, H
, were measured resistively with standard techniques. Magnetic fields up to 12 T were provided by a superconducting solenoid with a flowing gas cryostat in its central bore. Temperature was measured with a calibrated Pt resistor with correction for its magnetoresistance... we use here the 50% resistance drop as a convenient measure of H
(T)." No additional measurement details were noted.
Cautions: Evaluated Data
Critical Flux Density Hc2 for Y:123; [Y(Ca,Pr)-Ba-Cu-O]
| y of Cay (formula units) |
z of Prz (formula units) |
Temperature (K) |
Crit.Mag.Flux Density Hc2 (T) |
| 0 |
0 |
85 |
11.8 |
| 0 |
0 |
87 |
7.8 |
| 0 |
0 |
88 |
4.1 |
| 0 |
0 |
90 |
1.5 |
| 0 |
0 |
91 |
0.2 |
| 0.1 |
0.1 |
77 |
11.8 |
| 0.1 |
0.1 |
78 |
7.8 |
| 0.1 |
0.1 |
79 |
4.0 |
| 0.1 |
0.1 |
80 |
1.4 |
| 0.1 |
0.1 |
81 |
0.0 |
| 0.2 |
0.2 |
68 |
11.8 |
| 0.2 |
0.2 |
69 |
7.8 |
| 0.2 |
0.2 |
70 |
3.8 |
| 0.2 |
0.2 |
71 |
1.3 |
| 0.2 |
0.2 |
79 |
0.1 |
| 0.25 |
0.32 |
56 |
12.2 |
| 0.25 |
0.32 |
57 |
8.0 |
| 0.25 |
0.32 |
59 |
4.1 |
| 0.25 |
0.32 |
60 |
1.5 |
| 0.25 |
0.32 |
62 |
0.1 |
| 0.25 |
0.5 |
39 |
12.1 |
| 0.25 |
0.5 |
41 |
8.0 |
| 0.25 |
0.5 |
44 |
4.0 |
| 0.25 |
0.5 |
46 |
1.1 |
| 0.25 |
0.5 |
48 |
0.0 |
Measurement Method: Electrical resistance method
"T
c and the upper critical magnetic field, H
, were measured resistively with standard techniques. Magnetic fields up to 12 T were provided by a superconducting solenoid with a flowing gas cryostat in its central bore. Temperature was measured with a calibrated Pt resistor with correction for its magnetoresistance... we use here the 50% resistance drop as a convenient measure of H
(T)." No additional measurement details were noted.
Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
