Material Specification for Y:123; [Y(Ca,Pr)-Ba-Cu-O]
Process: Solid State Reaction
Notes: "The... samples were prepared from appropriate amounts of CuO, Y2O3, Pr6O11, CaCO3 and BaCO3 powders, which were carefully mixed... The mixtures were pressed into tablets and heat treated at 920 °C for 24 h, reground and sintered at 950 °C for 48 h in air. The samples were then oxygenized by heat treatment at 450 °C for 48 h in flowing oxygen gas."
Formula: Y1-2xCaxPrxBa2Cu3O7-y
Informal Name: Y:123
Chemical Family: Y(Ca,Pr)-Ba-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for Y:123; [Y(Ca,Pr)-Ba-Cu-O]
| Crystal System: | Orthorhombic |
| Formula Units per Cell: | |
| Space Group: |
|
Cell Parameters
| x (formula units) |
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 0.0 |
296 |
3.8234(2) |
3.8888(2) |
11.6918(6) |
| 0.1 |
296 |
3.8331(2) |
3.8897(3) |
11.6923(8) |
| 0.2 |
296 |
3.8397(2) |
3.8898(3) |
11.6932(9) |
Measurement Method: Neutron diffraction
"The neutron powder diffraction data were recorded at room temperature at the Swedish research reactor R2 in Studsvik. A double monochromator system using the (331)-planes of two copper crystals gave a wavelength of 1.335(2) σ and a neutron flux at the sample of approximately 2 x 10
5 cm
-2s
-1... The samples were contained in vanadium tubes (10 mm diameter) and the measurements were performed using a multi-detector system with 10 detectors spaced 3.21° apart. The 2θ scan covered the range 3.32°-128.04° in step of 0.08°. Structure refinements were based on the Rietveld method using the program LHPM1."
Cautions: Evaluated Data
