Material Specification for Bi:2212; [Bi-Sr-Ca-Cu-O]
Process: Solid State Reaction
Notes: The authors cite Y. Xu et al., Phys. Rev. B, Vol. 39, 6667 (1989), and summarize the procedure as follows. "... we made a series of measurements... for a set of c-axis-oriented powders... bulk sintered specimens of the desired compositions were prepared. For alignment of the c axis of the powders along the field direction, the specimens were crushed to an average powder size of (about) 10 µm and encapsulated in epoxy under a magnetic field of (8T = 80 kG)."
Formula: Bi2Sr2CaCu2O8
Informal Name: Bi:2212
Chemical Family: Bi-Sr-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Irreversibility Field for Bi:2212; [Bi-Sr-Ca-Cu-O]
| Temperature (K) |
Irreversibility Field (T) |
| 15.7 |
5.0 |
| 17.2 |
4.0 |
| 21.0 |
2.0 |
| 25.4 |
1.0 |
| 29.1 |
0.7 |
| 35.1 |
0.4 |
| 37.3 |
0.3 |
| 42.5 |
0.14 |
| 51.5 |
0.07 |
| 54.5 |
0.02 |
| 64.2 |
0.0 |
Measurement Method: SQUID magnetometer
"A commercial superconducting quantum interference device (SQUID) magnetometer was used for the measurements of magnetic properties. Initially, the specimen was cooled to (about) 5 K in zero field and then a chosen magnetic-field value was set in several incremental steps. The sample was then slowly warmed up to a temperature well above T
c(H) and then slowly field cooled. During a warm-up and cool-down cycle, the temperature was varied by 0.5-K steps for (about) 15-K spans below T
c(H) and near T
(H). Between these regions the temperature was changed by 1 or 2 K per step. At each temperature, three measurements (three scans) were taken with a 2-cm scan length... the trace of magnetic moment separates below T
(H) and two straight lines were drawn from the low-temperature side, and the intersection of these was defined as T
(H)."
Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
Material Specification for Bi:2223; [Bi-Sr-Ca-Cu-O]
Process: Solid State Reaction
Notes: The authors cite Y. Xu et al., Phys. Rev. B, Vol. 39, 6667 (1989), and summarize the procedure as follows. "... we made a series of measurements... for a set of c-axis-oriented powders... bulk sintered specimens of the desired compositions were prepared. For alignment of the c axis of the powders along the field direction, the specimens were crushed to an average powder size of (about) 10 µm and encapsulated in epoxy under a magnetic field of (8T = 80 kG)."
Formula: Bi2Sr2Ca2Cu3O10
Informal Name: Bi:2223
Chemical Family: Bi-Sr-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Irreversibility Field for Bi:2223; [Bi-Sr-Ca-Cu-O]
| Temperature (K) |
Irreversibility Field (T) |
| 25.4 |
5.0 |
| 26.1 |
4.0 |
| 28.4 |
3.0 |
| 31.3 |
2.0 |
| 40.3 |
1.0 |
| 47.8 |
0.5 |
| 60.4 |
0.2 |
| 70.9 |
0.1 |
Measurement Method: SQUID magnetometer
"A commercial superconducting quantum interference device (SQUID) magnetometer was used for the measurements of magnetic properties. Initially, the specimen was cooled to (about) 5 K in zero field and then a chosen magnetic-field value was set in several incremental steps. The sample was then slowly warmed up to a temperature well above T
c(H) and then slowly field cooled. During a warm-up and cool-down cycle, the temperature was varied by 0.5-K steps for (about) 15-K spans below T
c(H) and near T
(H). Between these regions the temperature was changed by 1 or 2 K per step. At each temperature, three measurements (three scans) were taken with a 2-cm scan length... the trace of magnetic moment separates below T
(H) and two straight lines were drawn from the low-temperature side, and the intersection of these was defined as T
(H)."
Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
