Material Specification for Dy:123; [Dy-Ba(Sr)-Cu-O]
Process: Solid State Reaction
Notes: "DyBaSrCu3Oy was prepared by mixing stoichiometric quantities of Dy2O3 (purity >99.9%), BaCO3 (>99.9%), SrCO3 (>99.9%) and CuO (>99.99%). After grinding the mixture in an automatic mill for an hour, the powder was pressed into pellets. The calcination of these pellets was carried out in air at 940 °C for 24 h, and then furnace cooled down to room temperature. The calcined pellets were then ground again for another hour, and pressed into pellets of 13 mm diameter with a pressure of 800 MPa. The second calcination, carried out under oxygen atmosphere, was performed at 940 °C for 24 h. The samples were then cooled down to room temperature at a rate of 100 °C per hour in an oxygen atmosphere. We henceforth denote these samples as Dy(T). An additional thermal treatment was done to some of the samples: first they were heated to 940 °C and maintained at that temperature for two hours, and then quenched to room temperature. Further oxygen annealing was performed at 650 °C for two hours and then the samples were cooled down to room temperature at 100 °C per hour under oxygen atmosphere. These samples are denoted as Dy(O)."
Formula: DyBaSrCu3Ox
Informal Name: Dy:123
Chemical Family: Dy-Ba(Sr)-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for Dy:123; [Dy-Ba(Sr)-Cu-O]
| Crystal System: | |
| Formula Units per Cell: | |
| Space Group: |
|
Cell Parameters
| x of Ox (formula units) |
Sample Number () |
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 6.93 |
Dy(O) |
296 |
3.816(1) |
3.838(1) |
11.542(4) |
| 6.94 |
Dy(T) |
296 |
3.828(1) |
-- |
11.533(2) |
Measurement Method: X-ray diffraction
"Structural determination was carried out by the powder X-ray diffraction (XRD) technique at room temperature by using CuKα radiation. The lattice parameters were calculated by a least squares refinement." No additional measurement details were noted.
Cautions: Evaluated Data
Critical Temperature for Dy:123; [Dy-Ba(Sr)-Cu-O]
| Sample Number () |
x of Ox (formula units) |
Critical Temperature (K) |
| Dy(O) |
6.93 |
83 |
| Dy(T) |
6.94 |
80 |
Measurement Method: Four-probe method
"The temperature dependence of the electrical resistivity was measured by employing a standard DC four-point probe technique from room temperature down to 10 K. Room temperature resistivity was determined by using the Van der Pauw method on a pellet with a thickness of about 0.7 mm."
Cautions: Evaluated Data
