Material Specification for Y:123; [Y-Ba-Cu-O]
Process: Solid State Reaction
Notes: "Unoriented Y-123 pellets were prepared from a precursor powder supplied by Rhone Poulenc. This material consists of a 123 stoichiometric mixture of Y, Ba and Cu compounds and has the advantages of being extremely homogeneous, reactive, and is available in relatively large quantities. This precursor was first subjected to several cycles comprising calcination in air at 875 °C for 24 h followed by grinding. The powder was then pressed into the form of a cylinder of 25 mm diam. and a height of 30-40 mm by application of a uniaxial pressure of 2 T/cm2. The pellets were next sintered in flowing oxygen for 12 h at 940 °C. Field textured material was prepared by reannealing these pellets in ZrO2 crucibles under an atmosphere of flowing oxygen in a magnetic field. This step was performed in a tubular furnace, placed in the room temperature bore of a superconducting magnet... a magnetic field of 7 T was applied at all temperatures in excess of 800 °C. The samples were heated at a rate of 100 °C/h to 1080 °C and held at this temperature for a short time. The temperature was then rapidly reduced to 1035 °C, followed by a slow cooling (2 °C/h)... After solidification and grain growth (were) complete (T<900 °c) the material was cooled at 60 °c />h to room temperature."
Formula: YBa2Cu3O7-x
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:
Critical Temperature for Y:123; [Y-Ba-Cu-O]
| Magnetic Field (T) |
Critical Temperature (K) |
| 0 |
90.5 |
| 1 |
89.0 |
| 2 |
88.0 |
| 3 |
87.2 |
| 4.5 |
86.3 |
Measurement Method: Four-probe method
"Samples with a form suitable for electrical transport measurements (length 5-20 mm, cross section 0.1-2 mm
2) were cut using a low speed diamond saw so that their long axis lies perpendicular to the axis of the annealing field, i.e. parallel to the a-b planes. High quality electrical contacts were made by first applying silver loaded paint, followed by a short heat treatment at 900 °C. The bars were then cooled to 420 °C and annealed for 72 h in flowing oxygen to increase the oxygen content. The contact resistance of the current contacts, determined using a four point measurement were 50 µΩ per contact at 77 K in zero field. At 6 T the contact resistance increased by less than 5%. An AC current was injected parallel to the a-b planes and the magnetic field was applied parallel to the c-axis."
Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
Critical Current Density for Y:123; [Y-Ba-Cu-O]
| Field Direction (w/r axes) |
Field Direction (w/r current I) |
Magnetic Field (T) |
Critical Current Density (kA/cm2) |
| ab-plane |
parallel |
0.0 |
17.3 |
| ab-plane |
parallel |
0.5 |
14.4 |
| ab-plane |
parallel |
1.0 |
11.2 |
| ab-plane |
parallel |
2.0 |
8.3 |
| ab-plane |
parallel |
3.0 |
6.7 |
| ab-plane |
parallel |
4.5 |
5.3 |
| ab-plane |
parallel |
5.5 |
4.5 |
| ab-plane |
parallel |
6.0 |
4.3 |
| ab-plane |
perp. |
0.0 |
16.5 |
| ab-plane |
perp. |
0.3 |
11.0 |
| ab-plane |
perp. |
0.7 |
8.6 |
| ab-plane |
perp. |
2.0 |
5.1 |
| ab-plane |
perp. |
4.0 |
3.5 |
| ab-plane |
perp. |
6.0 |
3.2 |
| c-axis |
perp. |
0.0 |
17.1 |
| c-axis |
perp. |
0.2 |
10.8 |
| c-axis |
perp. |
0.4 |
8.4 |
| c-axis |
perp. |
2.0 |
6.6 |
| c-axis |
perp. |
3.5 |
4.3 |
| c-axis |
perp. |
5.0 |
1.1 |
| c-axis |
perp. |
6.0 |
0.1 |
Measurement Method: Critical current method
"DC transport critical currents were measured at 77 K in fields up to 7 T. Measurements were made using a four point technique with an electric field criterion of 10 µV/cm. The samples were mounted on a sample holder designed to limit the stress/strain associated with thermal cycling and to withstand the large Lorentz forces which may arise during the measurements. Continuous currents may be injected into the sample via two copper plates which are soldered to the silver current pads with an In/Sn eutectic. The sample holder was immersed in liquid nitrogen and the current was passed parallel to the a-b planes whilst the magnetic field may be applied along any one of the three axes of the same under test.
Cautions: Evaluated Data
Digitized data were obtained from Figure 3 of the paper.
Resistivity (normal state) for Y:123; [Y-Ba-Cu-O]
| Magnetic Field (T) |
Temperature (K) |
Resistivity (normal state) (mΩ·cm) |
| 0 |
90.3 |
0.00 |
| 0 |
90.5 |
0.09 |
| 0 |
90.8 |
0.28 |
| 0 |
91.1 |
0.42 |
| 0 |
91.3 |
0.52 |
| 0 |
94.4 |
0.56 |
| 0 |
99.0 |
0.61 |
| 1 |
88.7 |
0.00 |
| 1 |
89.1 |
0.13 |
| 1 |
89.7 |
0.30 |
| 1 |
89.9 |
0.43 |
| 1 |
90.3 |
0.48 |
| 1 |
92.5 |
0.54 |
| 1 |
95.9 |
0.59 |
| 2 |
87.4 |
0.00 |
| 2 |
88.0 |
0.06 |
| 2 |
88.6 |
0.20 |
| 2 |
89.5 |
0.42 |
| 2 |
90.6 |
0.51 |
| 2 |
93.2 |
0.55 |
| 2 |
96.1 |
0.58 |
| 2 |
98.0 |
0.60 |
| 4 |
86.1 |
0.00 |
| 4 |
86.9 |
0.04 |
| 4 |
87.1 |
0.08 |
| 4 |
88.2 |
0.37 |
| 4 |
89.1 |
0.44 |
| 4 |
89.9 |
0.48 |
| 4 |
93.5 |
0.55 |
| 4 |
95.9 |
0.58 |
| 4 |
97.9 |
0.60 |
Measurement Method: Four-probe method
"Samples with a form suitable for electrical transport measurements (length 5-20 mm, cross section 0.1-2 mm
2) were cut using a low speed diamond saw so that their long axis lies perpendicular to the axis of the annealing field, i.e. parallel to the a-b planes. High quality electrical contacts were made by first applying silver loaded paint, followed by a short heat treatment at 900 °C. The bars were then cooled to 420 °C and annealed for 72 h in flowing oxygen to increase the oxygen content. The contact resistance of the current contacts, determined using a four point measurement were 50 µΩ per contact at 77 K in zero field. At 6 T the contact resistance increased by less than 5%. An AC current was injected parallel to the a-b planes and the magnetic field was applied parallel to the c-axis."
Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
