Material Specification for Bi:2212; [Bi-Sr-Ca-Cu-O]
Process: Solid State Reaction
Notes: "Dry powder of Bi2O3, SrCO3, CaCO3 and CuO with a caution molar ratio of 2212 were thoroughly mixed and ground. The powder was placed in an alumina crucible, and heated in a muffle furnace with an accurately programmed temperature control. The mixture was first heated to 1050 °C in 2 h, held at this temperature for 3 h and then cooled to 950 °C at 100 °C/h. After the mixture was held at 950 °C for 2 h, it was cooled to 850 °C at 3 °C/h and held for 1 h, and finally cooled to room temperature at 600 °C/h. The crystals were reduced in a tube furnace with H2 flowing at 400 °C for several hours. These reduced crystals can be reoxidized with O2 flowing at 450 °C for 12 h."
Formula: Bi2Sr2CaCu2Ox
Informal Name: Bi:2212
Chemical Family: Bi-Sr-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Single Crystal
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for Bi:2212; [Bi-Sr-Ca-Cu-O]
| Crystal System: | Orthorhombic |
| Formula Units per Cell: | |
| Space Group: |
|
Cell Parameters
| Hydrogen Reduction Time (h) |
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 0 |
296 |
5.4253(4) |
5.4255(4) |
30.944(3) |
| 3 |
296 |
5.4251(8) |
5.4290(8) |
30.945(6) |
| 7.5 |
296 |
5.4329(8) |
5.4264(8) |
30.907(6) |
| 12 |
296 |
5.4211(4) |
5.4255(4) |
30.926(3) |
Measurement Method: X-ray diffraction
"...cell parameters...were measured precisely by a Huber four-circle diffractometer." No additional measurement details were noted.
Cautions: Unevaluated Data
Critical Temperature for Bi:2212; [Bi-Sr-Ca-Cu-O]
| Hydrogen Reduction Time (h) |
Critical Temperature (K) |
| 0 |
80 |
| 3 |
25 |
| 7.5 |
10 |
| 12 |
5 |
Measurement Method: SQUID magnetometer
"Superconductivity was examined in a dc SQUID by placing a single crystal in a plastic bucket and measuring the magnetization with the a-b dimensions perpendicular to the magnetic field. The T
c was determined by the temperature dependence of the diamagnetic response, the magnetic critical current density was estimated by using Bean's model."
Cautions: Evaluated Data
Critical Current Density for Bi:2212; [Bi-Sr-Ca-Cu-O]
| Temperature (K) |
Oxidation Condition () |
Magnetic Field (T) |
Critical Current Density (kA/cm2) |
| 5 |
oxidized |
0.3 |
226 |
| 5 |
oxidized |
1.0 |
101 |
| 5 |
oxidized |
1.5 |
45 |
| 5 |
oxidized |
2.0 |
26 |
| 5 |
reduced |
0.3 |
47 |
| 5 |
reduced |
0.6 |
33 |
| 5 |
reduced |
1.0 |
27 |
| 5 |
reduced |
1.5 |
18 |
| 5 |
reduced |
2.0 |
17 |
| 5 |
reoxidized |
0.3 |
270 |
| 5 |
reoxidized |
0.6 |
180 |
| 5 |
reoxidized |
1.0 |
93 |
| 5 |
reoxidized |
1.5 |
13 |
| 5 |
reoxidized |
2.0 |
9 |
Measurement Method: SQUID magnetometer
"Superconductivity was examined in a dc SQUID by placing a single crystal in a plastic bucket and measuring the magnetization with the a-b dimensions perpendicular to the magnetic field. The T
c was determined by the temperature dependence of the diamagnetic response, the magnetic critical current density was estimated by using Bean's model."
Cautions: Evaluated Data
Digitized data were obtained from Figure 3 of the paper.
