Material Specification for Bi:2212; [Bi-Sr-Ca-Cu-O]
Process: Solid State Reaction
Notes: "The starting 2212 material was prepared by following the metal nitrate decomposition method. Bi(NO3)3•5H2O, SrCO3, CaCO3 and CuO were dissolved in nitric acid with cationic ratio corresponding to the 2212 compound. The solution was stirred and heated until the solvent evaporated and a light blue colored solid appeared. Nitrates were then decomposed at 1093 K for 12 hours. The powder so obtained was ground and pressed into pellets and was heated at 1133 K for 300 hours in air atmosphere, with intermediate grinding. Then, it was slowly cooled to 673 K... the cationic composition of the so obtained Bi-superconductor was determined by Inductive Coupling Plasma (ICP). Cationic composition, as deduced by ICP analysis, was 1.92:1.89:1.04:2.00."
Formula: Bi1.92Sr1.89Ca1.04Cu2Ox
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: | Tetragonal |
| Formula Units per Cell: | |
| Space Group: |
|
Cell Parameters
| x of Ox (formula units) |
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 7.973 |
296 |
5.402(2) |
-- |
30.76(1) |
| 7.938 |
296 |
5.406(1) |
-- |
30.78(1) |
| 7.930 |
296 |
5.401(1) |
-- |
30.81(1) |
| 7.923 |
296 |
5.405(1) |
-- |
30.87(1) |
| 7.915 |
296 |
5.406(1) |
-- |
30.87(1) |
| 7.818 |
296 |
5.406(1) |
-- |
30.87(1) |
Measurement Method: X-ray diffraction
"Powder X-ray characterization was performed on a Siemens D-500 diffractometer using CuKα radiation and silicon as internal standard." No additional measurement details were noted.
Cautions: Evaluated Data
Critical Temperature for Bi:2212; [Bi-Sr-Ca-Cu-O]
| x of Ox (formula units) |
Critical Temperature (K) |
| 7.973 |
71 |
| 7.938 |
83 |
| 7.930 |
89 |
| 7.923 |
91 |
| 7.915 |
93 |
| 7.818 |
93 |
Measurement Method: SQUID magnetometer
"... magnetic susceptibility measurements were performed using a DC SQUID Magnetometer (Quantum Design), while heating the sample from 10 K to 140 K at intervals of 1 K in a nominal magnetic field of (795.8 A/m = 10 Oe). The sample was cooled from room temperature to 10 K in a nominal magnetic field of (795.8 A/m = 10 Oe)."
Cautions: Evaluated Data
