Material Specification for YSr:123; [Y-Sr-Cu(Mo)-O]
Process: Solid State Reaction
Notes: "Samples... were prepared by mixing high-purity powders of CuO, Mo metal, SrCO3, and Y2O3. The mixtures were pressed into pellets (10 mm in diameter and 3 mm in thickness) under a pressure of 5 ton/cm2, which were then heated at a rate of 5 °C/min up to 1030 °C for 3 h and cooled down to room temperature at a rate of 1 °C/min in an oxygen atmosphere. After this initial reaction, all samples were reground, pressed into pellets, and heated under flowing oxygen for 3 h at 1040 °C, using the same heating and cooling rate."
Formula: YSr2Cu2.7Mo0.3O7
Informal Name: YSr:123
Chemical Family: Y-Sr-Cu(Mo)-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for YSr:123; [Y-Sr-Cu(Mo)-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | |
| Space Group: |
P4/mmm
|
Cell Parameters
| Occupancies () |
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| --- |
23 |
3.8138(2) |
-- |
11.5204(8) |
Atomic Coordinates
| Occupancies () |
Atom |
Temp
K
|
a-axis |
b-axis |
c-axis |
| 0.06(8) |
Mo(1) |
296 |
0 |
0 |
0 |
| 0.94(8) |
Cu(1) |
296 |
0 |
0 |
0 |
| 2.0 |
Sr |
296 |
0.5 |
0.5 |
0.1920(7) |
| 1.0 |
Y |
296 |
0.5 |
0.5 |
0.5 |
| 0.48(8) |
Mo(2) |
296 |
0 |
0 |
0.357(1) |
| 1.52(8) |
Cu(2) |
296 |
0 |
0 |
0.357(1) |
| 4.0 |
O(1) |
296 |
0 |
0.5 |
0.376(2) |
| 2.0 |
O(2) |
296 |
0 |
0 |
160(4) |
| 0.25 |
O(3) |
296 |
0.13(5) |
0.5 |
0 |
Measurement Method: X-ray diffraction
"Powder X-ray diffraction analyses were performed using a Philips PW 1820 X-ray diffractometer with Ni-filtered CuKα radiation. The sampling interval was 0.02° in 2θ, and the accumulation time was 10 s per step. The 2θ range was from 20° to 100°. The datasets were refined using the Rietveld analysis computer program DBWS-9006..."
Cautions: Evaluated Data
Caution for Atomic Coordinates: O(3) was refined off ideal site 2f, (0, 0.5, 0).
Critical Temperature for YSr:123; [Y-Sr-Cu(Mo)-O]
| Tc(Midpoint (K) |
Critical Temperature (K) |
| 45 |
37 |
Measurement Method: Four-probe method
"A standard four-probe method was used for the electrical resistance measurements. Electrical contacts to the sample were made by fine copper wires with a conductive silver paint, the applied current being 1 mA, and the temperature was recorded using a calibrated Pt sensor located adjacent to the sample."
Cautions: Evaluated Data
