Material Specification for La:21; [La(Pb)-Cu-O]
Process: Solid State Reaction
Notes: "... the synthesis was performed from the mixture of oxides (1-x/2)La2O3, xPbO2, 1CuO... in evacuated silica ampoules. The initimate mixtures of oxides were pelletized, placed in alumina crucibles and heated at temperatures ranging from 900 °C to 950 °C for 24 to 72 h. The samples were quenched at room temperature. Subsequent annealings at low temperature, 450 °C, for two to three days under oxygen pressures ranging from (1 MPa to
4 MPa = 10 bar to 40 bar) were then performed."
Formula: La1.5Pb0.5CuO4+x
Informal Name: La:21
Chemical Family: La(Pb)-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for La:21; [La(Pb)-Cu-O]
| Crystal System: | Orthorhombic |
| Formula Units per Cell: | |
| Space Group: |
Fmmm
|
Cell Parameters
|
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 296 |
5.3481(4) |
5.3667(4) |
13.2186(6) |
Measurement Method: X-ray diffraction
"X-ray powder diffraction patterns were registered by step scanning over an angular range of 20 ≤ 2θ ≤ 100° in increment of 0.05° with a Philips diffractometer using CuKα radiation. The Bragg reflections were used to refine the lattice parameters and the crystal structure with the profile refinement computer program DBW 3.2."
Cautions: Evaluated Data
Critical Temperature for La:21; [La(Pb)-Cu-O]
| Critical Temperature (K) |
| 15 |
Measurement Method: SQUID magnetometer
"The magnetic curves (were)... measured with a SQUID magnetometer, in a field of (0.7 mT = 7 G)." No additional measurement details were noted.
Cautions: Evaluated Data
