Material Specification for Y:123; [Y-Ba-Cu-O]
Process: Solid State Reaction
Notes: "The sample was prepared from a mixture of BaCO3, Y2O3, and CuO powders, in stoichiometric proportion according to the formula Ba2YCu3O7. The powders were ground together to a grain size less than 10 µm and heated to 950 °C for 12 h in air. The product was then quenched in air, reground, then heated and cooled under oxygen according to the following programs: heated from ambient to 950 °C at the rate of 500 °C/h, maintained at 950 °C for 10 h and then cooled to ambient temperature at the rate of 200 °C/h. The final pure black product was reground to a grain size less than 20 µm."
Formula: YBa2Cu3O7-x
Informal Name: Y:123
Chemical Family: Y-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-Ba-Cu-O]
| Crystal System: | Orthorhombic |
| Formula Units per Cell: | 1 |
| Space Group: |
Pmmm
|
Cell Parameters
|
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 5 |
3.8128(1) |
3.8806(2) |
11.6303(5) |
| 30 |
3.8124(2) |
3.8807(2) |
11.6303(5) |
| 75 |
3.8131(1) |
3.8806(2) |
11.6329(5) |
| 120 |
3.8141(1) |
3.8812(2) |
11.6395(5) |
| 200 |
3.8164(2) |
3.8824(2) |
11.6546(5) |
| 300 |
3.8206(1) |
3.8851(1) |
11.6757(4) |
Atomic Coordinates
| Atom |
Temp
K
|
a-axis |
b-axis |
c-axis |
| Y |
5 |
0.5 |
0.5 |
0.5 |
| Ba |
5 |
0.5 |
0.5 |
0.1826(5) |
| Cu(1) |
5 |
0 |
0 |
0 |
| Cu(2) |
5 |
0 |
0 |
0.3542(3) |
| O(1) |
5 |
0 |
0 |
0.1595(4) |
| O(2) |
5 |
0.5 |
0 |
0.3773(4) |
| O(3) |
5 |
0 |
0.5 |
0.3769(5) |
| O(4) |
5 |
0 |
0.5 |
0 |
| Y |
300 |
0.5 |
0.5 |
0.5 |
| Ba |
300 |
0.5 |
0.5 |
0.1841(4) |
| Cu(1) |
300 |
0 |
0 |
0 |
| Cu(2) |
300 |
0 |
0 |
0.3549(3) |
| O(1) |
300 |
0 |
0 |
0.1581(4) |
| O(2) |
300 |
0.5 |
0 |
0.3779(4) |
| O(3) |
300 |
0 |
0.5 |
0.3777(5) |
| O(4) |
300 |
0 |
0.5 |
0 |
Measurement Method: Neutron diffraction
"Neutron diffraction diagrams were collected...with a neutron wavelength of 1.909 σ on the high-resolution diffractometer D1A at the ILL. The 30 K and 200 K runs were for 12 hours, and the others for 3 hours. ... Profile refinement was (performed) using the program of Rietveld."
Cautions: Evaluated Data
Magnetic Susceptibility for Y:123; [Y-Ba-Cu-O]
| Temperature (K) |
Magnetic Susceptibility (arbitrary) |
| 4 |
-14.4 |
| 20 |
-14.2 |
| 40 |
-13.8 |
| 60 |
-12.8 |
| 80 |
-11.1 |
| 99 |
- 5.0 |
| 100 |
- 1.1 |
| 101 |
0.0 |
| 120 |
0.0 |
Measurement Method: Ac susceptibility
"The ac susceptibility of this sample as a function of temperature was measured with a mutual inductance bridge operating at 113 Hz. The a.c. field generated by the primary coil was (1.6 A/m = 0.02 Oe) peak to peak. For each temperature the sample was displaced from one to the other of the two secondary pick-up coils, thus eliminating parasitic contributions."
Cautions: Evaluated Data
Digitized data were obtained from Figure 1 of the paper.
