Material Specification for Y:123; [Y-Ba-Cu-O]
Process: Laser Ablation
Notes: "Thin film samples for this study were prepared by excimer laser deposition from pressed powder targets, consisting of unreacted mixtures of BaF2, Y2O3 and CuO... The substrates are unheated and no oxygen is supplied to the deposition chamber; the entire process is carried out in vacuum (0.1-1 mPa = 10-5-10-6 torr)... the targets were obtained by mixing and mechanically grinding high purity powders of BaF2, Y2O3 and CuO in the metal ratios Y:Ba:Cu=0.8:3.0:2.5. After mixing, the powders were pressed into circular disks (25 mm diameter) under (69 MPa = 10000 psi) and then heated in dry oxygen at 800 °C for 8 to 12 h to improve mechanical stability... The substrates were (001)SrTiO3... polished disks... Substrate preparation consisted of ultrasonic baths of acetone, isopropyl alcohol, and distilled water, followed by blow-drying with compressed nitrogen. Finally, the clean substrates were heated to 1000 °C in dry oxygen for 1 h. The film depositions were performed using a KrF excimer laser... operating at a wavelength of 248 nm and a repetition rate of 10 Hz. The laser output energy was continuously monitored and held constant. The laser beam was focused to a 1x2 mm2 size on the target, yielding an incident energy density of 1 J/cm2 pulse. The target was rotated slowly (0.2 rpm) in order to ablate uniformly from its entire surface. Substrates were positioned 3 to 5 cm away from the target, resulting in a deposition rate of 3 σ/s. After deposition, the films were transferred to a quartz tube furnace. The annealing schedule, which usually required 7 h from start to finish, consisted of a 45 min ramp from 25 °C to peak temperature (PT), a hold a PT for various intervals, followed by a 2 h ramp down to 440 °C to 25 °C over a period of about 3 h. For this investigation, the peak temperatures were varied from 825 °C to 875 °C and the hold times at PT ranged from 30 to 120 min. The heating and holding portions of this annealing schedule were carried out in the presence of flowing wet oxygen, while the cooling was performed in flowing dry oxygen..."
Formula: YBa2Cu3O7-x
Informal Name: Y:123
Chemical Family: Y-Ba-Cu-O
Chemical Class: Oxide
Structure Type:
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form: Thin Film
Critical Temperature for Y:123; [Y-Ba-Cu-O]
| Critical Temperature (K) |
| 89 |
Measurement Method: Four-probe method
"Electrical measurements were performed with the four-probe configuration using a computer automated system and measurement procedures... Electrical contacts were made using 60 µm and 25 µm gold wires held in place with colloidal gold or silver paste. Critical current density (J
c) measurements were made on films patterned into narrow geometries by physical masking of the substrate during deposition. Deposition masks were machined from thin (50 µm) stainless steel. The pattern consisted of large bonding pads (3x3 mm) connected by a narrow line, 1600 µm long and 55 µm wide. The filed criterion for the J
c measurements was 1 µV/cm."
Cautions: Evaluated Data
Critical Current Density for Y:123; [Y-Ba-Cu-O]
| Magnetic Field (T) |
Critical Current Density (kA/cm2) |
| 0.00 |
285 |
| 0.02 |
262 |
| 0.07 |
174 |
| 0.20 |
119 |
| 0.40 |
83 |
| 0.60 |
64 |
| 0.90 |
48 |
| 1.00 |
43 |
Measurement Method: Four-probe method
"Electrical measurements were performed with the four-probe configuration using a computer automated system and measurement procedures... Electrical contacts were made using 60 µm and 25 µm gold wires held in place with colloidal gold or silver paste. Critical current density (J
c) measurements were made on films patterned into narrow geometries by physical masking of the substrate during deposition. Deposition masks were machined from thin (50 µm) stainless steel. The pattern consisted of large bonding pads (3x3 mm) connected by a narrow line, 1600 µm long and 55 µm wide. The filed criterion for the J
c measurements was 1 µV/cm."
Cautions: Evaluated Data
Digitized data were obtained from Figure 11 of the paper.
Resistivity (normal state) for Y:123; [Y-Ba-Cu-O]
| Temperature (K) |
Resistivity (normal state) (mΩ·cm) |
| 89 |
0.00 |
| 90 |
0.12 |
| 100 |
0.25 |
| 300 |
0.81 |
Measurement Method: Four-probe method
"Electrical measurements were performed with the four-probe configuration using a computer automated system and measurement procedures... Electrical contacts were made using 60 µm and 25 µm gold wires held in place with colloidal gold or silver paste. Critical current density (J
c) measurements were made on films patterned into narrow geometries by physical masking of the substrate during deposition. Deposition masks were machined from thin (50 µm) stainless steel. The pattern consisted of large bonding pads (3x3 mm) connected by a narrow line, 1600 µm long and 55 µm wide. The filed criterion for the J
c measurements was 1 µV/cm."
Cautions: Evaluated Data
Digitized data were obtained from Fig. 10 of the paper.
