Material Specification for Bi:2212; [Bi-Sr-Ca-Cu-O]
Process: Solid State Reaction
Notes: "(The sample was)... prepared using Bi2O3, SrCO3, CaCo3, and CuO with purities better than 99.9%. A mixture of the oxides in the atomic ratio Sr:Ca:Cu = 2:1:2 was heated several times for 24 h at 900 °C with intermediate grindings. Bi2O3 was then added to get the atomic ration Bi:Sr:Ca:Cu = 2:2:1:2. The mixture was taken to melting point for a few seconds and then annealed in air at 850 °C for 16 h and air quenched."
Formula: Bi2Sr2CaCu2O8+x
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:
Crystallography for Bi:2212; [Bi-Sr-Ca-Cu-O]
| Crystal System: | Orthorhombic |
| Formula Units per Cell: | 4 |
| Space Group: |
Amaa
|
Cell Parameters
| Occupancy () |
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| -- |
296 |
5.365(4) |
5.424(4) |
30.74(1) |
Atomic Coordinates
| Occupancy () |
Atom |
Temp
K
|
a-axis |
b-axis |
c-axis |
| 0.82(1) |
Bi |
296 |
0 |
0.215(3) |
0.4486(3) |
| 0.92(2) |
Sr |
296 |
0 |
0.727(2) |
0.3571(3) |
| 1.16(4) |
Ca |
296 |
0 |
0.75 |
0.25 |
| 1.0 |
Cu |
296 |
0 |
0.238(2) |
0.3027(3) |
| 1.03(3) |
O1,1 |
296 |
0.25 |
0.0 |
0.3108(5) |
| 0.87(3) |
O1,2 |
296 |
0.25 |
0.5 |
0.2914(6) |
| 0.72(3) |
O2 |
296 |
0.073(6) |
0.580(5) |
0.4478(6) |
| 0.83(3) |
O3 |
296 |
0 |
0.209(5) |
0.3761(7) |
Measurement Method: Neutron diffraction
"The neutron diffraction study... was carried out at the ambient temperature at the Dhruva reactor, using a neutron wavelength of 1.216
σ. The instrument collimations from the in-pile to the detector end were 0.7°-0.5°-0.7°. The sample was in the form of a cylindrical stack of pellets, each of thickness about 1 mm, and diameter about 10 mm. The overall size of the cylindrical stack was approximately 10 mm high... The neutron difraction pattern... is analyzed by the Rietveld profile refinement method, using a modified version of the program DBW3.2."
Cautions: Evaluated Data
Critical Temperature for Bi:2212; [Bi-Sr-Ca-Cu-O]
| Critical Temperature (K) |
| 92.4 |
Measurement Method: Four probe method
"The temperature dependence of the resistivity is obtained using the d.c. four probe method and silver contacts... The transition temperature (R=0)... (was determined)." No additional measurement details were noted.
Cautions: Evaluated Data
