Material Specification for Y:247; [Y-Ba-Cu-O]
Process: Solid State Reaction
Notes: The authors cite J. Karpinski et al., Physica C, Vol. 161, 618 (1989), and summarize the procedure as follows. "A powder sample of chemical composition Y2Ba4Cu7O14.893 with Tc = 68 K was prepared... The oxygen content was determined using a high accuracy volumetric analysis."
Formula: Y2B4Cu7O15
Informal Name: Y:247
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:247; [Y-Ba-Cu-O]
| Crystal System: | Orthorhombic |
| Formula Units per Cell: | 2 |
| Space Group: |
Ammm
|
Cell Parameters
|
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 5 |
3.8388(1) |
3.8763(1) |
50.354(2) |
| 35 |
3.8388(1) |
3.8763(1) |
50.354(2) |
| 55 |
3.8390(1) |
3.8763(1) |
50.360(2) |
| 65 |
3.8390(1) |
3.8763(1) |
50.360(2) |
| 75 |
3.8393(1) |
3.8764(1) |
50.367(2) |
| 85 |
3.8394(1) |
3.8764(1) |
50.373(2) |
| 95 |
3.8396(1) |
3.8764(1) |
50.379(2) |
| 105 |
3.8398(1) |
3.8765(1) |
50.386(2) |
| 125 |
3.8402(1) |
3.8767(1) |
50.399(2) |
| 145 |
3.8407(1) |
3.8769(1) |
50.411(2) |
| 165 |
3.8413(1) |
3.8772(1) |
50.431(2) |
| 200 |
3.8423(1) |
3.8779(2) |
50.456(2) |
Atomic Coordinates
| Atom |
Temp
K
|
a-axis |
b-axis |
c-axis |
| Y |
5 |
0.5 |
0.5 |
0.1140(1) |
| Ba(1) |
5 |
0.5 |
0.5 |
0.0427(2) |
| Ba(2) |
5 |
0.5 |
0.5 |
0.1883(2) |
| Cu(1) |
5 |
0 |
0 |
0 |
| Cu(2) |
5 |
0 |
0 |
0.0818(1) |
| Cu(3) |
5 |
0 |
0 |
0.1493(1) |
| Cu(4) |
5 |
0 |
0 |
0.2304(1) |
| O(1) |
5 |
0 |
0 |
0.0346(2) |
| O(2) |
5 |
0.5 |
0 |
0.0865(2) |
| O(3) |
5 |
0 |
0.5 |
0.0868(1) |
| O(4) |
5 |
0.5 |
0 |
0.1445(2) |
| O(5) |
5 |
0 |
0.5 |
0.1437(2) |
| O(6) |
5 |
0 |
0 |
0.1933(1) |
| O(7) |
5 |
0 |
0.5 |
0.232(1) |
| O(8) |
5 |
O |
0.5 |
0 |
| O(9) |
5 |
0.5 |
0 |
0 |
| Y |
75 |
0.5 |
0.5 |
0.1141(1) |
| Ba(1) |
75 |
0.5 |
0.5 |
0.0428(2) |
| Ba(2) |
75 |
0.5 |
0.5 |
0.1885(2) |
| Cu(1) |
75 |
0 |
0 |
0 |
| Cu(2) |
75 |
0 |
0 |
0.0817(1) |
| Cu(3) |
75 |
0 |
0 |
0.1491(1) |
| Cu(4) |
75 |
0 |
0 |
0.2304(1) |
| O(1) |
75 |
0 |
0 |
0.0347(2) |
| O(2) |
75 |
0.5 |
0 |
0.0870(2) |
| O(3) |
75 |
0 |
0.5 |
0.0863(1) |
| O(4) |
75 |
0.5 |
0 |
0.1449(2) |
| O(5) |
75 |
0 |
0.5 |
0.1432(2) |
| O(6) |
75 |
0 |
0 |
0.1934(1) |
| O(7) |
75 |
0 |
0.5 |
0.2322(1) |
| O(8) |
75 |
0 |
0.5 |
0 |
| O(9) |
75 |
0.5 |
0 |
0 |
| Y |
200 |
0.5 |
0.5 |
0.1142(1) |
| Ba(1) |
200 |
0.5 |
0.5 |
0.0433(2) |
| Ba(2) |
200 |
0.5 |
0.5 |
0.1891(2) |
| Cu(1) |
200 |
0 |
0 |
0 |
| Cu(2) |
200 |
0 |
0 |
0.0817(1) |
| Cu(3) |
200 |
0 |
0 |
0.1489(1) |
| Cu(4) |
200 |
0 |
0 |
0.2304(1) |
| O(1) |
200 |
0 |
0 |
0.0348(2) |
| O(2) |
200 |
0.5 |
0 |
0.0857(1) |
| O(3) |
200 |
0 |
0.5 |
0.0860(1) |
| O(4) |
200 |
0.5 |
0 |
0.1452(2) |
| O(5) |
200 |
0 |
0.5 |
0.1426(2) |
| O(6) |
200 |
0 |
0 |
0.1935(1) |
| O(7) |
200 |
0 |
0.5 |
0.2326(2) |
| O(8) |
200 |
0 |
0.5 |
0 |
| O(9) |
200 |
0.5 |
0 |
0 |
Measurement Method: Neutron diffraction
"The... powder sample (was) enclosed in a cylindrical vanadium container of 8 mm diameter by 40 mm high... neutron diffraction measurements were made at the ILL high-flux reactor on the high-resolution neutron powder diffractometer D2B in the high intensity mode, with an angular step width of δ(2θ)=0.05°, and wavelength of... 1.5946(3) σ. The complete diffraction pattern was measured eight times at each temperature, and averaged over different detectors to improve statistics and reduce errors... Refinements of D2B data were made... with the standard Rietveld program..."
Cautions: Evaluated Data
Critical Temperature for Y:247; [Y-Ba-Cu-O]
| Critical Temperature (K) |
| 68 |
Measurement Method: Unknown Tc method
Cautions: Unevaluated Data
No measurement details were noted.
